How do I rename a column in a SQLite database table?

Question

I would need to rename a few columns in some tables in a SQLite database. I know that a similar question has been asked on stackoverflow previously, but it was for SQL in general, and the case of SQLite was not mentioned.

From the SQLite documentation for ALTER TABLE, I gather that it's not possible to do such a thing "easily" (i.e. a single ALTER TABLE statement).

I was wondering someone knew of a generic SQL way of doing such a thing with SQLite.

Answer 1

Say you have a table and need to rename "colb" to "col_b":

First you rename the old table:

ALTER TABLE orig_table_name RENAME TO tmp_table_name; 

Then create the new table, based on the old table but with the updated column name:

CREATE TABLE orig_table_name (   col_a INT , col_b INT ); 

Then copy the contents across from the original table.

INSERT INTO orig_table_name(col_a, col_b) SELECT col_a, colb FROM tmp_table_name; 

Lastly, drop the old table.

DROP TABLE tmp_table_name; 

Wrapping all this in a BEGIN TRANSACTION; and COMMIT; is also probably a good idea.