Convert signed to unsigned int column

Heng Ye :

How can I convert a signed int column to unsigned in MySQL?

I set a column to signed in CREATE TABLE and need to set it to UNSIGNED now.

Ahmed ElMetwally :

Syntax:

ALTER TABLE tbl_name MODIFY [COLUMN] col_name column_definition [FIRST | AFTER col_name]

Example:

ALTER TABLE tbl_name MODIFY col_name bigint(20) unsigned NOT NULL default '0';

Reference

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edited at2020-07-13

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