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Editorial Team
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Asked: 2026-06-01T22:00:35+00:00

I am having a table with ‘int’ column. During software upgrade, I want to

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I am having a table with ‘int’ column. During software upgrade, I want to change it to ‘long’ data type. It seems SQLite does not provide an option (in alter statement) to change/modify column properties. Since I want to do an upgrade, the table might contain data which the user should not lose. So please suggest me a good method to change the column data type property without data loss.

One way suggested in the search links is to create a temporary table, copy the records from the existing table, delete the existing table, and rename the temporary table. I doubt that is efficient.

Your help appreciated!

Regards

Vivek Ragunathan

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1 Answer

  1. Editorial Team

    I used the follow statements to change the type of the column.

    CREATE TABLE IF NOT EXISTS **TEMP_TABLE** (id integer primary key autoincrement, **col2change integer not null**, ...)

INSERT INTO TEMP_TABLE SELECT * FROM EXISTING_TABLE

DROP TABLE EXISTING_TABLE

ALTER TABLE TEMP_TABLE RENAME TO EXISTING_TABLE

    I changed the int type column in the existing table to integer type. For a few hundred rows, it was reasonably fast.

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