Question

Does anyone know how to change a column in SQLite and PostgreSQL to LONGTEXT?

I have done so in MySQL successfully with:
“ALTER TABLE projects MODIFY description LONGTEXT;”

But this clause doesn’t seem to work on SQLite. I tried hard to find documentation on PostgreSQL, but that site’s format really makes people puke. SQLite’s website is better but the only command I find relevant, alter table, doesn’t seem to support changing column data type at all. ( infact, it doesn’t even allow changing column name!!!)

Thanks all!

Answer 1

For PostgreSQL, see the doc here (e.g., ALTER TABLE my_table ALTER COLUMN my_col text).

The SQLite doc states

SQLite supports a limited subset of ALTER TABLE. The ALTER TABLE command in SQLite allows the user to rename a table or to add a new column to an existing table. It is not possible to rename a column, remove a column, or add or remove constraints from a table.

And I suppose changing the datatype of the column is out of scope. Probably to support this, you will need to do a SELECT * INTO ... followed by DROP TABLE ... and then create the table and run INSERT INTO ... SELECT * FROM ...