Question

I have a database, and I need to alter every single

tinyint(1) default null

column (and incidentally, every value in those columns set to null) in every single table in that database to:

tinyint(1) not null default 0

as soon as possible.

What is the fastest / most efficient way to achieve this, (programmatically or otherwise)?

Answer 1

Query information_schema.COLUMNS view for a list of tables/columns, then use your programming language of choice to loop through the results and perform ALTER TABLE queries.

SELECT TABLE_NAME, COLUMN_NAME 
FROM information_schema.COLUMNS
WHERE TABLE_SCHEMA = 'yourDatabase'
AND COLUMN_TYPE = 'tinyint(1)'