Sqlite Drop Column: Difference between revisions
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It's obvious that this is a little bit complex. But if you use sqlitebrowser [3] this can be done with a few mouse-clicks (look under -->modify table for a button "remove field". | It's obvious that this is a little bit complex. But if you use sqlitebrowser [3] this can be done with a few mouse-clicks (look under -->modify table for a button "remove field". See also the Firefox SQLite Manager add-on [4], which is similar to SqliteBrowser. | ||
* [1] http://www.sqlite.org/omitted.html | * [1] http://www.sqlite.org/omitted.html | ||
* [2] http://www.sqlite.org/faq.html#q11 | * [2] http://www.sqlite.org/faq.html#q11 | ||
* [3] http://sqlitebrowser.sourceforge.net/ | * [3] http://sqlitebrowser.sourceforge.net/ | ||
* [4] https://addons.mozilla.org/en-US/firefox/addon/5817 | |||
[[Category:FAQ]] | [[Category:FAQ]] |
Revision as of 13:29, 25 May 2008
Q: How can I drop a column in sqlite-databases?
New A: GRASS 6.3.cvs contains v.db.dropcol which supports it.
Old A: It is not possible to drop columns within sqlite using the syntax ALTER TABLE DROP COLUMN [1]. However, there is a workaround for this issue [2]:
BEGIN TRANSACTION; CREATE TEMPORARY TABLE t1_backup(a,b); INSERT INTO t1_backup SELECT a,b FROM t1; DROP TABLE t1; CREATE TABLE t1(a,b); INSERT INTO t1 SELECT a,b FROM t1_backup; DROP TABLE t1_backup; COMMIT;
It's obvious that this is a little bit complex. But if you use sqlitebrowser [3] this can be done with a few mouse-clicks (look under -->modify table for a button "remove field". See also the Firefox SQLite Manager add-on [4], which is similar to SqliteBrowser.