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 sql=file.sql
Example: Select all from table roads
db.select -c driver=odbc database=g51test
table=roads sql=file.sql > result.csv
Example: Select some string attribute, exclude others:
echo "SELECT * FROM archsites WHERE str1 <> 'No Name'" | db.select
Example: Select some string attribute with ZERO length:
echo "SELECT * FROM archsites WHERE str1 IS NULL" | db.select
Example: Select coordinates from PostGIS table:
echo "SELECT x(geo),y(geo) FROM localizzazione" | db.select
SEE ALSO
GRASS 5.7 tutorial pages,
db.connect,
db.describe,
db.drivers,
db.droptable,
db.execute,
db.login,
db.tables,
GRASS SQL interface
AUTHOR
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Modifications: Radim Blazek, ITC-Irst, Trento, Italy
Last changed: $Date$