db.select

## NAME

db.select - Select data from database.

## KEYWORDS

database, SQL

## SYNOPSIS

db.select
db.select help
db.select [-cdv] [table=string] [database=string] [driver=string] [sql=string] [fs=string] [vs=string] [nv=string] [input=filename]

### Flags:

-c
  do not include column names in output
-d
  describe query only (don't run it)
-v
  vertical output (instead of horizontal)

### Parameters:

table=string
  Table name, select all from this table
database=string
  database name
driver=string
  driver name
  Options: dbf,odbc,mysql,pg,ogr
sql=string
  SQL select statement, for example: 'select * from rybniky where kapri = 'hodne'
fs=string
  output field separator
  Default: |
vs=string
  output vertical record separator
nv=string
  null value indicator
input=filename
  filename 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: 2006/09/21 06:14:49 $

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