NAME
db.select - Selects data from table.
KEYWORDS
database, SQL
SYNOPSIS
db.select
db.select help
db.select [-cdvt] [table=name] [database=name] [driver=name] [sql=string] [fs=character] [vs=character] [nv=string] [input=name] [--verbose] [--quiet]
Flags:
- -c
- Do not include column names in output
- -d
- Describe query only (don't run it)
- -v
- Vertical output (instead of horizontal)
- -t
- Only test query, do not execute
- --verbose
- Verbose module output
- --quiet
- Quiet module output
Parameters:
- table=name
- Table name
- database=name
- Database name
- Default: $GISDBASE/$LOCATION_NAME/$MAPSET/dbf/
- driver=name
- Driver name
- Options: ogr,sqlite,mysql,pg,odbc,dbf
- Default: dbf
- sql=string
- SQL select statement
- For example: 'select * from rybniky where kapri = 'hodne'
- fs=character
- Output field separator
- Default: |
- vs=character
- Output vertical record separator
- nv=string
- Null value indicator
- input=name
- Name of file with sql statement
DESCRIPTION
db.select prints result of selection from database
based on SQL statement read from input file or from standard input
to standard output.
NOTE
If parameters for database connection are already set with
db.connect, they are taken as default values and
do not need to be spcified each time. Output will be displayed to stdout or can
be directed to a file.
EXAMPLES
echo "select * from roads" | db.select
or
cat file.sql | db.select
or
db.select input=file.sql
Select all from table roads
db.select -c driver=odbc database=g51test table=roads input=file.sql > result.csv
Select some string attribute, exclude others:
echo "SELECT * FROM archsites WHERE str1 <> 'No Name'" | db.select
Select some string attribute with ZERO length:
echo "SELECT * FROM archsites WHERE str1 IS NULL" | db.select
Select coordinates from PostGIS table:
echo "SELECT x(geo),y(geo) FROM localizzazione" | db.select
SEE ALSO
GRASS SQL interface,
db.connect,
db.describe,
db.drivers,
db.droptable,
db.execute,
db.login,
db.tables
AUTHOR
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Modifications: Radim Blazek, ITC-Irst, Trento, Italy
Last changed: $Date: 2006-09-20 21:31:01 -0700 (Wed, 20 Sep 2006) $
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