Provided by: postgresql-client-8.3_8.3.4-2.2_i386 bug

NAME

       CREATE TABLE - define a new table

SYNOPSIS

       CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } ] TABLE table_name ( [
         { column_name data_type [ DEFAULT default_expr ] [ column_constraint [ ... ] ]
           | table_constraint
           | LIKE parent_table [ { INCLUDING | EXCLUDING } { DEFAULTS | CONSTRAINTS | INDEXES } ] ... }
           [, ... ]
       ] )
       [ INHERITS ( parent_table [, ... ] ) ]
       [ WITH ( storage_parameter [= value] [, ... ] ) | WITH OIDS | WITHOUT OIDS ]
       [ ON COMMIT { PRESERVE ROWS | DELETE ROWS | DROP } ]
       [ TABLESPACE tablespace ]

       where column_constraint is:

       [ CONSTRAINT constraint_name ]
       { NOT NULL |
         NULL |
         UNIQUE index_parameters |
         PRIMARY KEY index_parameters |
         CHECK ( expression ) |
         REFERENCES reftable [ ( refcolumn ) ] [ MATCH FULL | MATCH PARTIAL | MATCH SIMPLE ]
           [ ON DELETE action ] [ ON UPDATE action ] }
       [ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]

       and table_constraint is:

       [ CONSTRAINT constraint_name ]
       { UNIQUE ( column_name [, ... ] ) index_parameters |
         PRIMARY KEY ( column_name [, ... ] ) index_parameters |
         CHECK ( expression ) |
         FOREIGN KEY ( column_name [, ... ] ) REFERENCES reftable [ ( refcolumn [, ... ] ) ]
           [ MATCH FULL | MATCH PARTIAL | MATCH SIMPLE ] [ ON DELETE action ] [ ON UPDATE action ] }
       [ DEFERRABLE | NOT DEFERRABLE ] [ INITIALLY DEFERRED | INITIALLY IMMEDIATE ]

       index_parameters in UNIQUE and PRIMARY KEY constraints are:

       [ WITH ( storage_parameter [= value] [, ... ] ) ]
       [ USING INDEX TABLESPACE tablespace ]

DESCRIPTION

       CREATE  TABLE  will  create a new, initially empty table in the current
       database. The table will be owned by the user issuing the command.

       If a schema name is given (for example, CREATE  TABLE  myschema.mytable
       ...) then the table is created in the specified schema. Otherwise it is
       created in the current schema. Temporary  tables  exist  in  a  special
       schema,  so  a  schema  name  cannot be given when creating a temporary
       table. The name of the table must be distinct  from  the  name  of  any
       other table, sequence, index, or view in the same schema.

       CREATE TABLE also automatically creates a data type that represents the
       composite type corresponding to one row of the table. Therefore, tables
       cannot have the same name as any existing data type in the same schema.

       The optional constraint clauses specify constraints (tests) that new or
       updated rows must satisfy for an insert or update operation to succeed.
       A constraint is an SQL object that helps define the set of valid values
       in the table in various ways.

       There  are two ways to define constraints: table constraints and column
       constraints. A column  constraint  is  defined  as  part  of  a  column
       definition.  A  table constraint definition is not tied to a particular
       column, and it can  encompass  more  than  one  column.   Every  column
       constraint  can  also  be  written  as  a  table  constraint;  a column
       constraint is only a notational convenience for use when the constraint
       only affects one column.

PARAMETERS

       TEMPORARY or TEMP
              If  specified,  the  table  is  created  as  a  temporary table.
              Temporary tables are automatically  dropped  at  the  end  of  a
              session,  or  optionally  at  the end of the current transaction
              (see ON COMMIT below). Existing permanent tables with  the  same
              name  are not visible to the current session while the temporary
              table exists, unless they are referenced  with  schema-qualified
              names.   Any   indexes   created   on   a  temporary  table  are
              automatically temporary as well.

              Optionally, GLOBAL or LOCAL can be written before  TEMPORARY  or
              TEMP.    This   makes  no  difference  in  PostgreSQL,  but  see
              Compatibility [create_table(7)].

       table_name
              The name  (optionally  schema-qualified)  of  the  table  to  be
              created.

       column_name
              The name of a column to be created in the new table.

       data_type
              The  data type of the column. This can include array specifiers.
              For more information on the data types supported by  PostgreSQL,
              refer to in the documentation.

       DEFAULT
              The  DEFAULT  clause assigns a default data value for the column
              whose column definition it appears  within.  The  value  is  any
              variable-free  expression  (subqueries  and  cross-references to
              other columns in the current table are not  allowed).  The  data
              type  of  the default expression must match the data type of the
              column.

              The default expression will be used in any insert operation that
              does  not specify a value for the column. If there is no default
              for a column, then the default is null.

       INHERITS ( parent_table [, ... ] )
              The optional INHERITS clause specifies a  list  of  tables  from
              which the new table automatically inherits all columns.

              Use  of  INHERITS  creates a persistent relationship between the
              new child table and its parent table(s). Schema modifications to
              the  parent(s)  normally  propagate  to children as well, and by
              default the data of the child table is included in scans of  the
              parent(s).

              If the same column name exists in more than one parent table, an
              error is reported unless the data types of the columns match  in
              each  of  the  parent  tables. If there is no conflict, then the
              duplicate columns are merged to form a single column in the  new
              table.  If  the  column  name  list  of the new table contains a
              column name that is also inherited, the data type must  likewise
              match  the  inherited  column(s), and the column definitions are
              merged into one. However, inherited and new column  declarations
              of  the  same  name  need not specify identical constraints: all
              constraints provided from any declaration  are  merged  together
              and  all  are  applied  to  the  new  table.  If  the  new table
              explicitly specifies  a  default  value  for  the  column,  this
              default  overrides  any  defaults from inherited declarations of
              the column. Otherwise, any parents that specify  default  values
              for  the  column  must all specify the same default, or an error
              will be reported.

       LIKE parent_table [ { INCLUDING | EXCLUDING } { DEFAULTS |  CONSTRAINTS
       | INDEXES } ]
              The LIKE clause specifies a  table  from  which  the  new  table
              automatically  copies  all  column  names, their data types, and
              their not-null constraints.

              Unlike INHERITS, the new table and original table are completely
              decoupled  after  creation  is complete. Changes to the original
              table will not be applied to  the  new  table,  and  it  is  not
              possible  to  include  data  of  the  new  table in scans of the
              original table.

              Default expressions for the copied column definitions will  only
              be  copied  if  INCLUDING  DEFAULTS  is  specified.  The default
              behavior is to exclude default  expressions,  resulting  in  the
              copied columns in the new table having null defaults.

              Not-null  constraints are always copied to the new table.  CHECK
              constraints will only be  copied  if  INCLUDING  CONSTRAINTS  is
              specified;  other  types  of  constraints  will never be copied.
              Also, no distinction is  made  between  column  constraints  and
              table  constraints  —  when constraints are requested, all check
              constraints are copied.

              Any indexes on the original table will not be created on the new
              table, unless the INCLUDING INDEXES clause is specified.

              Note  also  that unlike INHERITS, copied columns and constraints
              are not merged with similarly named columns and constraints.  If
              the same name is specified explicitly or in another LIKE clause,
              an error is signalled.

       CONSTRAINT constraint_name
              An optional name for  a  column  or  table  constraint.  If  the
              constraint  is violated, the constraint name is present in error
              messages, so constraint names like col must be positive  can  be
              used  to  communicate  helpful  constraint information to client
              applications.  (Double-quotes are needed to  specify  constraint
              names  that  contain  spaces.)   If  a  constraint  name  is not
              specified, the system generates a name.

       NOT NULL
              The column is not allowed to contain null values.

       NULL   The column is allowed  to  contain  null  values.  This  is  the
              default.

              This clause is only provided for compatibility with non-standard
              SQL databases. Its use is discouraged in new applications.

       UNIQUE (column constraint)

       UNIQUE ( column_name [, ... ] ) (table constraint)
              The UNIQUE constraint specifies that a  group  of  one  or  more
              columns  of a table can contain only unique values. The behavior
              of the unique table constraint is the same as  that  for  column
              constraints,  with  the  additional  capability to span multiple
              columns.

              For the purpose of a unique  constraint,  null  values  are  not
              considered equal.

              Each  unique table constraint must name a set of columns that is
              different from the set of columns named by any other  unique  or
              primary  key  constraint  defined  for  the table. (Otherwise it
              would just be the same constraint listed twice.)

       PRIMARY KEY (column constraint)

       PRIMARY KEY ( column_name [, ... ] ) (table constraint)
              The primary key constraint specifies that a column or columns of
              a table can contain only unique (non-duplicate), nonnull values.
              Technically, PRIMARY KEY is merely a combination of  UNIQUE  and
              NOT  NULL,  but identifying a set of columns as primary key also
              provides metadata about the design of the schema, as  a  primary
              key implies that other tables can rely on this set of columns as
              a unique identifier for rows.

              Only one primary key can be specified for a table, whether as  a
              column constraint or a table constraint.

              The  primary key constraint should name a set of columns that is
              different from  other  sets  of  columns  named  by  any  unique
              constraint defined for the same table.

       CHECK ( expression )
              The  CHECK  clause  specifies  an expression producing a Boolean
              result which new or updated rows must satisfy for an  insert  or
              update  operation  to succeed. Expressions evaluating to TRUE or
              UNKNOWN succeed. Should any row of an insert or update operation
              produce  a  FALSE  result  an  error exception is raised and the
              insert or update does not alter the database. A check constraint
              specified  as a column constraint should reference that column’s
              value only, while an expression appearing in a table  constraint
              can reference multiple columns.

              Currently, CHECK expressions cannot contain subqueries nor refer
              to variables other than columns of the current row.

       REFERENCES reftable [ ( refcolumn ) ] [ MATCH matchtype ] [  ON  DELETE
       action ] [ ON UPDATE action ] (column constraint)

       FOREIGN KEY ( column [, ... ] )
              These clauses specify a foreign key constraint,  which  requires
              that  a  group of one or more columns of the new table must only
              contain values that match values in the referenced column(s)  of
              some  row  of the referenced table. If refcolumn is omitted, the
              primary key of the reftable is used. The referenced columns must
              be  the  columns  of  a  unique or primary key constraint in the
              referenced table. Note that foreign key  constraints  cannot  be
              defined between temporary tables and permanent tables.

              A  value  inserted  into  the  referencing  column(s) is matched
              against the  values  of  the  referenced  table  and  referenced
              columns using the given match type. There are three match types:
              MATCH FULL, MATCH PARTIAL, and MATCH SIMPLE, which is  also  the
              default.  MATCH  FULL will not allow one column of a multicolumn
              foreign key to be null unless all foreign key columns are  null.
              MATCH  SIMPLE  allows  some foreign key columns to be null while
              other parts of the foreign key are not null.  MATCH  PARTIAL  is
              not yet implemented.

              In addition, when the data in the referenced columns is changed,
              certain actions are  performed  on  the  data  in  this  table’s
              columns.  The  ON  DELETE clause specifies the action to perform
              when a referenced row in the referenced table is being  deleted.
              Likewise,  the  ON UPDATE clause specifies the action to perform
              when a referenced  column  in  the  referenced  table  is  being
              updated  to  a  new  value.  If  the  row  is  updated,  but the
              referenced column is not actually changed, no  action  is  done.
              Referential  actions  other  than  the NO ACTION check cannot be
              deferred, even if the constraint is declared  deferrable.  There
              are the following possible actions for each clause:

              NO ACTION
                     Produce  an  error indicating that the deletion or update
                     would create a foreign key constraint violation.  If  the
                     constraint  is  deferred,  this error will be produced at
                     constraint  check  time  if   there   still   exist   any
                     referencing rows. This is the default action.

              RESTRICT
                     Produce  an  error indicating that the deletion or update
                     would create a foreign key constraint violation.  This is
                     the  same  as  NO  ACTION  except  that  the check is not
                     deferrable.

              CASCADE
                     Delete any rows referencing the deleted  row,  or  update
                     the  value  of the referencing column to the new value of
                     the referenced column, respectively.

              SET NULL
                     Set the referencing column(s) to null.

              SET DEFAULT
                     Set the referencing column(s) to their default values.

       If the referenced column(s) are changed frequently, it might be wise to
       add  an  index  to  the  foreign key column so that referential actions
       associated  with  the  foreign  key  column  can  be   performed   more
       efficiently.

       DEFERRABLE

       NOT DEFERRABLE
              This   controls  whether  the  constraint  can  be  deferred.  A
              constraint that is not deferrable will  be  checked  immediately
              after every command. Checking of constraints that are deferrable
              can be postponed until the end of the transaction (using the SET
              CONSTRAINTS  [set_constraints(7)]  command).   NOT DEFERRABLE is
              the default. Only foreign key constraints currently accept  this
              clause. All other constraint types are not deferrable.

       INITIALLY IMMEDIATE

       INITIALLY DEFERRED
              If a constraint is deferrable, this clause specifies the default
              time to check the constraint. If  the  constraint  is  INITIALLY
              IMMEDIATE,  it  is  checked  after  each  statement. This is the
              default. If the constraint is INITIALLY DEFERRED, it is  checked
              only  at  the  end of the transaction. The constraint check time
              can be altered with  the  SET  CONSTRAINTS  [set_constraints(7)]
              command.

       WITH ( storage_parameter [= value] [, ... ] )
              This clause specifies optional storage parameters for a table or
              index;  see  Storage  Parameters  [create_table(7)]   for   more
              information.  The  WITH  clause  for  a  table  can also include
              OIDS=TRUE (or just OIDS) to specify that rows of the  new  table
              should  have  OIDs  (object  identifiers)  assigned  to them, or
              OIDS=FALSE to specify that the rows should not  have  OIDs.   If
              OIDS  is  not  specified,  the  default setting depends upon the
              default_with_oids configuration parameter.  (If  the  new  table
              inherits  from  any  tables  that  have  OIDs, then OIDS=TRUE is
              forced even if the command says OIDS=FALSE.)

              If OIDS=FALSE is specified or implied, the new  table  does  not
              store  OIDs  and no OID will be assigned for a row inserted into
              it. This is  generally  considered  worthwhile,  since  it  will
              reduce  OID  consumption  and thereby postpone the wraparound of
              the 32-bit OID counter. Once the counter wraps around, OIDs  can
              no longer be assumed to be unique, which makes them considerably
              less useful. In addition, excluding OIDs from  a  table  reduces
              the space required to store the table on disk by 4 bytes per row
              (on most machines), slightly improving performance.

              To remove OIDs from a table after it has been created, use ALTER
              TABLE [alter_table(7)].

       WITH OIDS

       WITHOUT OIDS
              These  are  obsolescent  syntaxes  equivalent to WITH (OIDS) and
              WITH (OIDS=FALSE), respectively. If you wish  to  give  both  an
              OIDS setting and storage parameters, you must use the WITH ( ...
              ) syntax; see above.

       ON COMMIT
              The behavior of temporary tables at the  end  of  a  transaction
              block can be controlled using ON COMMIT.  The three options are:

              PRESERVE ROWS
                     No special action is taken at the ends  of  transactions.
                     This is the default behavior.

              DELETE ROWS
                     All  rows  in  the temporary table will be deleted at the
                     end of each transaction block. Essentially, an  automatic
                     TRUNCATE [truncate(7)] is done at each commit.

              DROP   The  temporary  table  will  be dropped at the end of the
                     current transaction block.

       TABLESPACE tablespace
              The tablespace is the name of the tablespace in  which  the  new
              table is to be created.  If not specified, default_tablespace is
              consulted, or temp_tablespaces if the table is temporary.

       USING INDEX TABLESPACE tablespace
              This clause allows selection of  the  tablespace  in  which  the
              index associated with a UNIQUE or PRIMARY KEY constraint will be
              created.  If not specified, default_tablespace is consulted,  or
              temp_tablespaces if the table is temporary.

   STORAGE PARAMETERS
       The  WITH  clause  can  specify  storage parameters for tables, and for
       indexes associated with a UNIQUE or  PRIMARY  KEY  constraint.  Storage
       parameters    for    indexes    are    documented   in   CREATE   INDEX
       [create_index(7)]. The only storage parameter currently  available  for
       tables is:

       FILLFACTOR
              The  fillfactor  for a table is a percentage between 10 and 100.
              100 (complete packing) is the default. When a smaller fillfactor
              is  specified,  INSERT  operations  pack table pages only to the
              indicated percentage;  the  remaining  space  on  each  page  is
              reserved  for  updating  rows  on that page. This gives UPDATE a
              chance to place the updated copy of a row on the  same  page  as
              the  original,  which  is  more  efficient  than placing it on a
              different page.  For a table whose entries  are  never  updated,
              complete  packing  is  the  best  choice, but in heavily updated
              tables smaller fillfactors are appropriate.

NOTES

       Using OIDs in new applications  is  not  recommended:  where  possible,
       using  a  SERIAL or other sequence generator as the table’s primary key
       is preferred. However, if your application does make  use  of  OIDs  to
       identify specific rows of a table, it is recommended to create a unique
       constraint on the oid column of that table, to ensure that OIDs in  the
       table will indeed uniquely identify rows even after counter wraparound.
       Avoid assuming that OIDs are  unique  across  tables;  if  you  need  a
       database-wide  unique  identifier,  use the combination of tableoid and
       row OID for the purpose.

              Tip: The use of OIDS=FALSE is not recommended for tables with no
              primary  key,  since without either an OID or a unique data key,
              it is difficult to identify specific rows.

       PostgreSQL automatically creates an index for  each  unique  constraint
       and  primary  key  constraint  to  enforce  uniqueness. Thus, it is not
       necessary to create an index explicitly for primary key  columns.  (See
       CREATE INDEX [create_index(7)] for more information.)

       Unique  constraints  and  primary keys are not inherited in the current
       implementation. This makes the combination of  inheritance  and  unique
       constraints rather dysfunctional.

       A table cannot have more than 1600 columns. (In practice, the effective
       limit is usually lower because of tuple-length constraints.)

EXAMPLES

       Create table films and table distributors:

       CREATE TABLE films (
           code        char(5) CONSTRAINT firstkey PRIMARY KEY,
           title       varchar(40) NOT NULL,
           did         integer NOT NULL,
           date_prod   date,
           kind        varchar(10),
           len         interval hour to minute
       );

       CREATE TABLE distributors (
            did    integer PRIMARY KEY DEFAULT nextval(’serial’),
            name   varchar(40) NOT NULL CHECK (name <> ’’)
       );

       Create a table with a 2-dimensional array:

       CREATE TABLE array_int (
           vector  int[][]
       );

       Define a unique table constraint for  the  table  films.  Unique  table
       constraints can be defined on one or more columns of the table:

       CREATE TABLE films (
           code        char(5),
           title       varchar(40),
           did         integer,
           date_prod   date,
           kind        varchar(10),
           len         interval hour to minute,
           CONSTRAINT production UNIQUE(date_prod)
       );

       Define a check column constraint:

       CREATE TABLE distributors (
           did     integer CHECK (did > 100),
           name    varchar(40)
       );

       Define a check table constraint:

       CREATE TABLE distributors (
           did     integer,
           name    varchar(40)
           CONSTRAINT con1 CHECK (did > 100 AND name <> ’’)
       );

       Define a primary key table constraint for the table films:

       CREATE TABLE films (
           code        char(5),
           title       varchar(40),
           did         integer,
           date_prod   date,
           kind        varchar(10),
           len         interval hour to minute,
           CONSTRAINT code_title PRIMARY KEY(code,title)
       );

       Define  a  primary key constraint for table distributors. The following
       two examples are equivalent,  the  first  using  the  table  constraint
       syntax, the second the column constraint syntax:

       CREATE TABLE distributors (
           did     integer,
           name    varchar(40),
           PRIMARY KEY(did)
       );

       CREATE TABLE distributors (
           did     integer PRIMARY KEY,
           name    varchar(40)
       );

       Assign  a  literal  constant default value for the column name, arrange
       for the default value of column did to be generated  by  selecting  the
       next  value of a sequence object, and make the default value of modtime
       be the time at which the row is inserted:

       CREATE TABLE distributors (
           name      varchar(40) DEFAULT ’Luso Films’,
           did       integer DEFAULT nextval(’distributors_serial’),
           modtime   timestamp DEFAULT current_timestamp
       );

       Define two NOT NULL column constraints on the table  distributors,  one
       of which is explicitly given a name:

       CREATE TABLE distributors (
           did     integer CONSTRAINT no_null NOT NULL,
           name    varchar(40) NOT NULL
       );

       Define a unique constraint for the name column:

       CREATE TABLE distributors (
           did     integer,
           name    varchar(40) UNIQUE
       );

       The same, specified as a table constraint:

       CREATE TABLE distributors (
           did     integer,
           name    varchar(40),
           UNIQUE(name)
       );

       Create  the  same  table, specifying 70% fill factor for both the table
       and its unique index:

       CREATE TABLE distributors (
           did     integer,
           name    varchar(40),
           UNIQUE(name) WITH (fillfactor=70)
       )
       WITH (fillfactor=70);

       Create table cinemas in tablespace diskvol1:

       CREATE TABLE cinemas (
               id serial,
               name text,
               location text
       ) TABLESPACE diskvol1;

COMPATIBILITY

       The CREATE TABLE command conforms to the SQL standard, with  exceptions
       listed below.

   TEMPORARY TABLES
       Although the syntax of CREATE TEMPORARY TABLE resembles that of the SQL
       standard, the effect is not the same. In the standard, temporary tables
       are  defined  just  once  and  automatically exist (starting with empty
       contents)  in  every  session  that  needs  them.   PostgreSQL  instead
       requires  each  session to issue its own CREATE TEMPORARY TABLE command
       for each temporary table to be used. This allows different sessions  to
       use  the  same temporary table name for different purposes, whereas the
       standard’s approach constrains all instances of a given temporary table
       name to have the same table structure.

       The standard’s definition of the behavior of temporary tables is widely
       ignored. PostgreSQL’s behavior on this point  is  similar  to  that  of
       several other SQL databases.

       The standard’s distinction between global and local temporary tables is
       not in PostgreSQL, since that distinction depends  on  the  concept  of
       modules,  which  PostgreSQL  does  not have.  For compatibility’s sake,
       PostgreSQL will accept the GLOBAL and LOCAL  keywords  in  a  temporary
       table declaration, but they have no effect.

       The  ON  COMMIT  clause  for  temporary  tables  also resembles the SQL
       standard, but has  some  differences.   If  the  ON  COMMIT  clause  is
       omitted,  SQL  specifies  that the default behavior is ON COMMIT DELETE
       ROWS. However, the default behavior in PostgreSQL is ON COMMIT PRESERVE
       ROWS. The ON COMMIT DROP option does not exist in SQL.

   COLUMN CHECK CONSTRAINTS
       The  SQL  standard says that CHECK column constraints can only refer to
       the column they apply to; only CHECK table  constraints  can  refer  to
       multiple  columns.   PostgreSQL  does  not enforce this restriction; it
       treats column and table check constraints alike.

   NULL ‘‘CONSTRAINT’’
       The NULL ‘‘constraint’’ (actually a  non-constraint)  is  a  PostgreSQL
       extension  to  the SQL standard that is included for compatibility with
       some other database  systems  (and  for  symmetry  with  the  NOT  NULL
       constraint).  Since  it  is the default for any column, its presence is
       simply noise.

   INHERITANCE
       Multiple inheritance via the INHERITS clause is a  PostgreSQL  language
       extension.   SQL:1999  and  later  define  single  inheritance  using a
       different syntax and different semantics. SQL:1999-style inheritance is
       not yet supported by PostgreSQL.

   ZERO-COLUMN TABLES
       PostgreSQL  allows  a  table  of no columns to be created (for example,
       CREATE TABLE foo();). This is an extension from the SQL standard, which
       does  not  allow  zero-column  tables.  Zero-column  tables  are not in
       themselves very useful, but disallowing them creates odd special  cases
       for  ALTER  TABLE  DROP COLUMN, so it seems cleaner to ignore this spec
       restriction.

   WITH CLAUSE
       The WITH clause is a PostgreSQL extension; neither  storage  parameters
       nor OIDs are in the standard.

   TABLESPACES
       The  PostgreSQL  concept  of  tablespaces  is not part of the standard.
       Hence,  the  clauses  TABLESPACE  and  USING   INDEX   TABLESPACE   are
       extensions.

SEE ALSO

       ALTER   TABLE  [alter_table(7)],  DROP  TABLE  [drop_table(l)],  CREATE
       TABLESPACE [create_tablespace(l)]