Is there a way in MySQL to reverse a boolean field with one query?

Question

I have a column in my table titled \'authorised\'. Its default is 0. It needs to be changed to 1 when the user is authorised, but it must be able to be reset to 0. I know I

Answer 1

Its also possible to use XOR if your 'boolean' field is implemented as a TINYINT:

UPDATE users SET authorised = authorised XOR 1 WHERE id = 2;

This will set 'authorised' to 0 if currently 1, and to 1 if currently 0. It will also zeroise all non-zero values, so is an ideal solution if you (like me) use several positive values to reflect a variety of 'on' levels, but always need to revert to 0 when 'off'.

Answer 2

There are multiple ways to do this, here's a simple one:

UPDATE users SET authorised = ABS(authorised - 1) WHERE id = 2;

Answer 3

UPDATE users SET `authorised` = IF (`authorised`, 0, 1)

Answer 4

UPDATE `users` SET `authorised` = NOT `authorised` WHERE id = 2

This query will also work to negate the field, and is more inline with boolean syntax.