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Asked: 2026-05-15T13:10:55+00:00

I’d like to update all NULL fields in one table to 0. Of course

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I’d like to update all NULL fields in one table to 0. Of course 

UPDATE mytable SET firstcol=0 WHERE firstcol IS NULL

would do the job. But I wonder if there´s a smarter solution than just c&p this line for every column.

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1 Answer

  1. Editorial Team

    Can you just ALTER the columns to NOT NULL DEFAULT 0?

    You can do this in a single statement, as per MySQL documentation:

    You can issue multiple ADD, ALTER, DROP, and CHANGE clauses in a single ALTER TABLE statement, separated by commas. This is a MySQL extension to standard SQL, which allows only one of each clause per ALTER TABLE statement.

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