Question

I have a problem: I need to delete a column from my SQLite database. I wrote this query

alter table table_name drop column column_name 

but it does not work. Please help me.

Answer 1

Update: SQLite 2021-03-12 (3.35.0) now supports DROP COLUMN.

---

From: http://www.sqlite.org/faq.html:

(11) How do I add or delete columns from an existing table in SQLite.

SQLite has limited ALTER TABLE support that you can use to add a
column to the end of a table or to change the name of a table. If you
want to make more complex changes in the structure of a table, you
will have to recreate the table. You can save existing data to a
temporary table, drop the old table, create the new table, then copy
the data back in from the temporary table.

For example, suppose you have a table named "t1" with columns names
"a", "b", and "c" and that you want to delete column "c" from this
table. The following steps illustrate how this could be done:

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;