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NAME  - Selects data from attribute table.
       Performs SQL query statement(s).


       database, attribute table, SQL

SYNOPSIS --help   [-cdvt]    [sql=sql_query]     [input=name]     [table=name]     [driver=name]
       [database=name]            [separator=character]            [vertical_separator=character]
       [null_value=string]    [output=name]    [--overwrite]   [--help]   [--verbose]   [--quiet]

           Do not include column names in output

           Describe query only (don’t run it)

           Vertical output (instead of horizontal)

           Only test query, do not execute

           Allow output files to overwrite existing files

           Print usage summary

           Verbose module output

           Quiet module output

           Force launching GUI dialog

           SQL select statement
           For example: ’select * from rybniky where kapri = ’hodne’

           Name of file containing SQL select statement(s)
           ’-’ for standard input

           Name of table to query

           Name of database driver
           Options: mysql, odbc, sqlite, pg, ogr, dbf
           Default: sqlite

           Name of database
           Default: $GISDBASE/$LOCATION_NAME/$MAPSET/sqlite/sqlite.db

           Field separator
           Special characters: pipe, comma, space, tab, newline
           Default: pipe

           Vertical record separator (requires -v flag)
           Special characters: pipe, comma, space, tab, newline

           String representing NULL value

           Name for output file (if omitted or "-" output to stdout)

DESCRIPTION prints result of selection from database based on SQL statement read from  input
       file or from standard input to standard output.


       If  parameters  for database connection are already set with db.connect, they are taken as
       default values and do not need to be specified each time.  Output  will  be  displayed  to
       standard output or can be directed to a file (option output).


   Basic usage sql="select * from roads"
       echo "select * from roads" | input=-
       or input=file.sql
       cat file.sql | input=-

       Select all from table roads: -c driver=odbc database=mydb table=hospitals \
                 input=file.sql output=result.csv

       Select some string attribute, exclude others: sql="SELECT * FROM archsites WHERE str1 <> ’No Name’"

       Select some string attribute with ZERO length: sql="SELECT * FROM archsites WHERE str1 IS NULL"

       Select coordinates from PostGIS table: sql="SELECT x(geo),y(geo) FROM localizzazione"

   Execute multiple SQL statements
       cat file.sql
       SELECT * FROM busstopsall WHERE cat = 1
       SELECT cat FROM busstopsall WHERE cat > 4 AND cat < 8 input=file.sql

   Count number of cases falling into same position
       When  multiple  observation  have  the  spatial coordinates, they can still be counted (if
       needed, coordinates can be uploaded to the attribute table by sql="SELECT long,lat,site_id,department,obs,COUNT(long) as count_cases \
                      FROM diseases GROUP BY long,lat"


        db.connect, db.describe, db.drivers, db.droptable, db.execute, db.login, db.tables

        GRASS SQL interface


       Original author unknown (probably CERL)
       Modifications by Radim Blazek, ITC-Irst, Trento, Italy
       Support for multiple statements by Martin Landa, Czech Technical University in Prague

       Last changed: $Date: 2014-11-28 10:58:18 +0100 (Fri, 28 Nov 2014) $

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