Prevent failures when adding NOT NULL constraints with Atlas

by rotemtam 3 years ago

macOS • xterm-256color • zsh 246 views

Modifying nullable column to non-nullable might fail in case it contains NULL values. For example:

ALTER TABLE t MODIFY COLUMN c int NOT NULL;

The solution, in this case, is to backfill NULL values with a default value:

UPDATE t SET c = 0 WHERE c IS NULL; ALTER TABLE t MODIFY COLUMN c int NOT NULL;

Enforce this kind of safety using the Atlas GitHub Action: https://atlasgo.io/integrations/github-actions

https://asciinema.org/a/522592

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