Provided by: postgresql-client-14_14.15-0ubuntu0.22.04.1_amd64 
NAME
INSERT - create new rows in a table
SYNOPSIS
[ WITH [ RECURSIVE ] with_query [, ...] ]
INSERT INTO table_name [ AS alias ] [ ( column_name [, ...] ) ]
[ OVERRIDING { SYSTEM | USER } VALUE ]
{ DEFAULT VALUES | VALUES ( { expression | DEFAULT } [, ...] ) [, ...] | query }
[ ON CONFLICT [ conflict_target ] conflict_action ]
[ RETURNING { * | output_expression [ [ AS ] output_name ] } [, ...] ]
where conflict_target can be one of:
( { index_column_name | ( index_expression ) } [ COLLATE collation ] [ opclass ] [, ...] ) [ WHERE index_predicate ]
ON CONSTRAINT constraint_name
and conflict_action is one of:
DO NOTHING
DO UPDATE SET { column_name = { expression | DEFAULT } |
( column_name [, ...] ) = [ ROW ] ( { expression | DEFAULT } [, ...] ) |
( column_name [, ...] ) = ( sub-SELECT )
} [, ...]
[ WHERE condition ]
DESCRIPTION
INSERT inserts new rows into a table. One can insert one or more rows specified by value expressions, or
zero or more rows resulting from a query.
The target column names can be listed in any order. If no list of column names is given at all, the
default is all the columns of the table in their declared order; or the first N column names, if there
are only N columns supplied by the VALUES clause or query. The values supplied by the VALUES clause or
query are associated with the explicit or implicit column list left-to-right.
Each column not present in the explicit or implicit column list will be filled with a default value,
either its declared default value or null if there is none.
If the expression for any column is not of the correct data type, automatic type conversion will be
attempted.
INSERT into tables that lack unique indexes will not be blocked by concurrent activity. Tables with
unique indexes might block if concurrent sessions perform actions that lock or modify rows matching the
unique index values being inserted; the details are covered in Section 62.5. ON CONFLICT can be used to
specify an alternative action to raising a unique constraint or exclusion constraint violation error.
(See ON CONFLICT Clause below.)
The optional RETURNING clause causes INSERT to compute and return value(s) based on each row actually
inserted (or updated, if an ON CONFLICT DO UPDATE clause was used). This is primarily useful for
obtaining values that were supplied by defaults, such as a serial sequence number. However, any
expression using the table's columns is allowed. The syntax of the RETURNING list is identical to that of
the output list of SELECT. Only rows that were successfully inserted or updated will be returned. For
example, if a row was locked but not updated because an ON CONFLICT DO UPDATE ... WHERE clause condition
was not satisfied, the row will not be returned.
You must have INSERT privilege on a table in order to insert into it. If ON CONFLICT DO UPDATE is
present, UPDATE privilege on the table is also required.
If a column list is specified, you only need INSERT privilege on the listed columns. Similarly, when ON
CONFLICT DO UPDATE is specified, you only need UPDATE privilege on the column(s) that are listed to be
updated. However, ON CONFLICT DO UPDATE also requires SELECT privilege on any column whose values are
read in the ON CONFLICT DO UPDATE expressions or condition.
Use of the RETURNING clause requires SELECT privilege on all columns mentioned in RETURNING. If you use
the query clause to insert rows from a query, you of course need to have SELECT privilege on any table or
column used in the query.
PARAMETERS
Inserting
This section covers parameters that may be used when only inserting new rows. Parameters exclusively used
with the ON CONFLICT clause are described separately.
with_query
The WITH clause allows you to specify one or more subqueries that can be referenced by name in the
INSERT query. See Section 7.8 and SELECT(7) for details.
It is possible for the query (SELECT statement) to also contain a WITH clause. In such a case both
sets of with_query can be referenced within the query, but the second one takes precedence since it
is more closely nested.
table_name
The name (optionally schema-qualified) of an existing table.
alias
A substitute name for table_name. When an alias is provided, it completely hides the actual name of
the table. This is particularly useful when ON CONFLICT DO UPDATE targets a table named excluded,
since that will otherwise be taken as the name of the special table representing the row proposed for
insertion.
column_name
The name of a column in the table named by table_name. The column name can be qualified with a
subfield name or array subscript, if needed. (Inserting into only some fields of a composite column
leaves the other fields null.) When referencing a column with ON CONFLICT DO UPDATE, do not include
the table's name in the specification of a target column. For example, INSERT INTO table_name ... ON
CONFLICT DO UPDATE SET table_name.col = 1 is invalid (this follows the general behavior for UPDATE).
OVERRIDING SYSTEM VALUE
If this clause is specified, then any values supplied for identity columns will override the default
sequence-generated values.
For an identity column defined as GENERATED ALWAYS, it is an error to insert an explicit value (other
than DEFAULT) without specifying either OVERRIDING SYSTEM VALUE or OVERRIDING USER VALUE. (For an
identity column defined as GENERATED BY DEFAULT, OVERRIDING SYSTEM VALUE is the normal behavior and
specifying it does nothing, but PostgreSQL allows it as an extension.)
OVERRIDING USER VALUE
If this clause is specified, then any values supplied for identity columns are ignored and the
default sequence-generated values are applied.
This clause is useful for example when copying values between tables. Writing INSERT INTO tbl2
OVERRIDING USER VALUE SELECT * FROM tbl1 will copy from tbl1 all columns that are not identity
columns in tbl2 while values for the identity columns in tbl2 will be generated by the sequences
associated with tbl2.
DEFAULT VALUES
All columns will be filled with their default values, as if DEFAULT were explicitly specified for
each column. (An OVERRIDING clause is not permitted in this form.)
expression
An expression or value to assign to the corresponding column.
DEFAULT
The corresponding column will be filled with its default value. An identity column will be filled
with a new value generated by the associated sequence. For a generated column, specifying this is
permitted but merely specifies the normal behavior of computing the column from its generation
expression.
query
A query (SELECT statement) that supplies the rows to be inserted. Refer to the SELECT(7) statement
for a description of the syntax.
output_expression
An expression to be computed and returned by the INSERT command after each row is inserted or
updated. The expression can use any column names of the table named by table_name. Write * to return
all columns of the inserted or updated row(s).
output_name
A name to use for a returned column.
ON CONFLICT Clause
The optional ON CONFLICT clause specifies an alternative action to raising a unique violation or
exclusion constraint violation error. For each individual row proposed for insertion, either the
insertion proceeds, or, if an arbiter constraint or index specified by conflict_target is violated, the
alternative conflict_action is taken. ON CONFLICT DO NOTHING simply avoids inserting a row as its
alternative action. ON CONFLICT DO UPDATE updates the existing row that conflicts with the row proposed
for insertion as its alternative action.
conflict_target can perform unique index inference. When performing inference, it consists of one or more
index_column_name columns and/or index_expression expressions, and an optional index_predicate. All
table_name unique indexes that, without regard to order, contain exactly the conflict_target-specified
columns/expressions are inferred (chosen) as arbiter indexes. If an index_predicate is specified, it
must, as a further requirement for inference, satisfy arbiter indexes. Note that this means a non-partial
unique index (a unique index without a predicate) will be inferred (and thus used by ON CONFLICT) if such
an index satisfying every other criteria is available. If an attempt at inference is unsuccessful, an
error is raised.
ON CONFLICT DO UPDATE guarantees an atomic INSERT or UPDATE outcome; provided there is no independent
error, one of those two outcomes is guaranteed, even under high concurrency. This is also known as UPSERT
— “UPDATE or INSERT”.
conflict_target
Specifies which conflicts ON CONFLICT takes the alternative action on by choosing arbiter indexes.
Either performs unique index inference, or names a constraint explicitly. For ON CONFLICT DO NOTHING,
it is optional to specify a conflict_target; when omitted, conflicts with all usable constraints (and
unique indexes) are handled. For ON CONFLICT DO UPDATE, a conflict_target must be provided.
conflict_action
conflict_action specifies an alternative ON CONFLICT action. It can be either DO NOTHING, or a DO
UPDATE clause specifying the exact details of the UPDATE action to be performed in case of a
conflict. The SET and WHERE clauses in ON CONFLICT DO UPDATE have access to the existing row using
the table's name (or an alias), and to the row proposed for insertion using the special excluded
table. SELECT privilege is required on any column in the target table where corresponding excluded
columns are read.
Note that the effects of all per-row BEFORE INSERT triggers are reflected in excluded values, since
those effects may have contributed to the row being excluded from insertion.
index_column_name
The name of a table_name column. Used to infer arbiter indexes. Follows CREATE INDEX format. SELECT
privilege on index_column_name is required.
index_expression
Similar to index_column_name, but used to infer expressions on table_name columns appearing within
index definitions (not simple columns). Follows CREATE INDEX format. SELECT privilege on any column
appearing within index_expression is required.
collation
When specified, mandates that corresponding index_column_name or index_expression use a particular
collation in order to be matched during inference. Typically this is omitted, as collations usually
do not affect whether or not a constraint violation occurs. Follows CREATE INDEX format.
opclass
When specified, mandates that corresponding index_column_name or index_expression use particular
operator class in order to be matched during inference. Typically this is omitted, as the equality
semantics are often equivalent across a type's operator classes anyway, or because it's sufficient to
trust that the defined unique indexes have the pertinent definition of equality. Follows CREATE INDEX
format.
index_predicate
Used to allow inference of partial unique indexes. Any indexes that satisfy the predicate (which need
not actually be partial indexes) can be inferred. Follows CREATE INDEX format. SELECT privilege on
any column appearing within index_predicate is required.
constraint_name
Explicitly specifies an arbiter constraint by name, rather than inferring a constraint or index.
condition
An expression that returns a value of type boolean. Only rows for which this expression returns true
will be updated, although all rows will be locked when the ON CONFLICT DO UPDATE action is taken.
Note that condition is evaluated last, after a conflict has been identified as a candidate to update.
Note that exclusion constraints are not supported as arbiters with ON CONFLICT DO UPDATE. In all cases,
only NOT DEFERRABLE constraints and unique indexes are supported as arbiters.
INSERT with an ON CONFLICT DO UPDATE clause is a “deterministic” statement. This means that the command
will not be allowed to affect any single existing row more than once; a cardinality violation error will
be raised when this situation arises. Rows proposed for insertion should not duplicate each other in
terms of attributes constrained by an arbiter index or constraint.
Note that it is currently not supported for the ON CONFLICT DO UPDATE clause of an INSERT applied to a
partitioned table to update the partition key of a conflicting row such that it requires the row be moved
to a new partition.
Tip
It is often preferable to use unique index inference rather than naming a constraint directly using
ON CONFLICT ON CONSTRAINT
constraint_name. Inference will continue to work correctly when the underlying index is replaced by
another more or less equivalent index in an overlapping way, for example when using CREATE UNIQUE
INDEX ... CONCURRENTLY before dropping the index being replaced.
OUTPUTS
On successful completion, an INSERT command returns a command tag of the form
INSERT oid count
The count is the number of rows inserted or updated. oid is always 0 (it used to be the OID assigned to
the inserted row if count was exactly one and the target table was declared WITH OIDS and 0 otherwise,
but creating a table WITH OIDS is not supported anymore).
If the INSERT command contains a RETURNING clause, the result will be similar to that of a SELECT
statement containing the columns and values defined in the RETURNING list, computed over the row(s)
inserted or updated by the command.
NOTES
If the specified table is a partitioned table, each row is routed to the appropriate partition and
inserted into it. If the specified table is a partition, an error will occur if one of the input rows
violates the partition constraint.
EXAMPLES
Insert a single row into table films:
INSERT INTO films VALUES
('UA502', 'Bananas', 105, '1971-07-13', 'Comedy', '82 minutes');
In this example, the len column is omitted and therefore it will have the default value:
INSERT INTO films (code, title, did, date_prod, kind)
VALUES ('T_601', 'Yojimbo', 106, '1961-06-16', 'Drama');
This example uses the DEFAULT clause for the date columns rather than specifying a value:
INSERT INTO films VALUES
('UA502', 'Bananas', 105, DEFAULT, 'Comedy', '82 minutes');
INSERT INTO films (code, title, did, date_prod, kind)
VALUES ('T_601', 'Yojimbo', 106, DEFAULT, 'Drama');
To insert a row consisting entirely of default values:
INSERT INTO films DEFAULT VALUES;
To insert multiple rows using the multirow VALUES syntax:
INSERT INTO films (code, title, did, date_prod, kind) VALUES
('B6717', 'Tampopo', 110, '1985-02-10', 'Comedy'),
('HG120', 'The Dinner Game', 140, DEFAULT, 'Comedy');
This example inserts some rows into table films from a table tmp_films with the same column layout as
films:
INSERT INTO films SELECT * FROM tmp_films WHERE date_prod < '2004-05-07';
This example inserts into array columns:
-- Create an empty 3x3 gameboard for noughts-and-crosses
INSERT INTO tictactoe (game, board[1:3][1:3])
VALUES (1, '{{" "," "," "},{" "," "," "},{" "," "," "}}');
-- The subscripts in the above example aren't really needed
INSERT INTO tictactoe (game, board)
VALUES (2, '{{X," "," "},{" ",O," "},{" ",X," "}}');
Insert a single row into table distributors, returning the sequence number generated by the DEFAULT
clause:
INSERT INTO distributors (did, dname) VALUES (DEFAULT, 'XYZ Widgets')
RETURNING did;
Increment the sales count of the salesperson who manages the account for Acme Corporation, and record the
whole updated row along with current time in a log table:
WITH upd AS (
UPDATE employees SET sales_count = sales_count + 1 WHERE id =
(SELECT sales_person FROM accounts WHERE name = 'Acme Corporation')
RETURNING *
)
INSERT INTO employees_log SELECT *, current_timestamp FROM upd;
Insert or update new distributors as appropriate. Assumes a unique index has been defined that constrains
values appearing in the did column. Note that the special excluded table is used to reference values
originally proposed for insertion:
INSERT INTO distributors (did, dname)
VALUES (5, 'Gizmo Transglobal'), (6, 'Associated Computing, Inc')
ON CONFLICT (did) DO UPDATE SET dname = EXCLUDED.dname;
Insert a distributor, or do nothing for rows proposed for insertion when an existing, excluded row (a row
with a matching constrained column or columns after before row insert triggers fire) exists. Example
assumes a unique index has been defined that constrains values appearing in the did column:
INSERT INTO distributors (did, dname) VALUES (7, 'Redline GmbH')
ON CONFLICT (did) DO NOTHING;
Insert or update new distributors as appropriate. Example assumes a unique index has been defined that
constrains values appearing in the did column. WHERE clause is used to limit the rows actually updated
(any existing row not updated will still be locked, though):
-- Don't update existing distributors based in a certain ZIP code
INSERT INTO distributors AS d (did, dname) VALUES (8, 'Anvil Distribution')
ON CONFLICT (did) DO UPDATE
SET dname = EXCLUDED.dname || ' (formerly ' || d.dname || ')'
WHERE d.zipcode <> '21201';
-- Name a constraint directly in the statement (uses associated
-- index to arbitrate taking the DO NOTHING action)
INSERT INTO distributors (did, dname) VALUES (9, 'Antwerp Design')
ON CONFLICT ON CONSTRAINT distributors_pkey DO NOTHING;
Insert new distributor if possible; otherwise DO NOTHING. Example assumes a unique index has been defined
that constrains values appearing in the did column on a subset of rows where the is_active Boolean column
evaluates to true:
-- This statement could infer a partial unique index on "did"
-- with a predicate of "WHERE is_active", but it could also
-- just use a regular unique constraint on "did"
INSERT INTO distributors (did, dname) VALUES (10, 'Conrad International')
ON CONFLICT (did) WHERE is_active DO NOTHING;
COMPATIBILITY
INSERT conforms to the SQL standard, except that the RETURNING clause is a PostgreSQL extension, as is
the ability to use WITH with INSERT, and the ability to specify an alternative action with ON CONFLICT.
Also, the case in which a column name list is omitted, but not all the columns are filled from the VALUES
clause or query, is disallowed by the standard.
The SQL standard specifies that OVERRIDING SYSTEM VALUE can only be specified if an identity column that
is generated always exists. PostgreSQL allows the clause in any case and ignores it if it is not
applicable.
Possible limitations of the query clause are documented under SELECT(7).