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Full Discussion: Selective delete in SQL
Top Forums UNIX for Dummies Questions & Answers Selective delete in SQL Post 302772253 by sonia102 on Sunday 24th of February 2013 05:09:12 PM
Old 02-24-2013
Selective delete in SQL

Hi All

This might be a weird query but its related to deleting specific details in database.

Bascially I had built a database using a set of files
Code:
seq1 of 300 mb
seq2 of 200 mb
seq3 of 350 mb
seq4 of 300 mb

and after building the database i realized that i didn't need the whole data. i am required to not only delete content of database related to seq2 to seq4 but also delete content related to last 200 bytes in seq1

Basically i am required to retain only first 100 mb of data in seq1.

without going through the whole procedure of rebuilding the db could i delete contents of database corresponding to these requirements.
i know its a little unusal but could some one give a direction.

Thanks
Smilie
 

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grass-sqlite(1grass)						Grass User's Manual					      grass-sqlite(1grass)

NAME
grass-sqlite - SQLite driver SQLite driver SQLite driver in GRASS Creating a SQLite database GRASS is automatically creating the SQLite database if it is not yet existing when the first table is created in the SQLite database. It is sufficient to define the connection (see next step). Connecting GRASS to SQLite The database name 'sqlite.db' is at user's choice. Also the file storage location can be freely chosen. If the database does not exist, it will be automatically created when database content is created: # example for storing DB in mapset directory (keep single quotes): db.connect driver=sqlite database='$GISDBASE/$LOCATION_NAME/$MAPSET/sqlite.db' db.connect -p Supported SQL commands All SQL commands supported by SQLite (for limitations, see SQLite help page: SQL As Understood By SQLite and Unsupported SQL). Operators available in conditions All SQL operators supported by SQLite. Browsing table data in DB A convenient SQLite front-end is sqlitebrowser. To open a DB file stored within the current mapset, the following way is suggested (corre- sponds to above database connection): eval `g.gisenv` # use double quotes: sqlitebrowser "$GISDBASE/$LOCATION_NAME/$MAPSET"/sqlite.db SEE ALSO
db.connect, db.execute, db.select SQL support in GRASS GIS SQLite web site, SQLite manual, sqlite - Management Tools Last changed: $Date: 2011-02-07 18:59:50 +0100 (Mon, 07 Feb 2011) $ Help Index GRASS 6.4.2 grass-sqlite(1grass)
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