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All MySQL error codes
MySQL error code

MySQL error 1222

MySQL server error 1222 is ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT, reported with SQLSTATE 21000.

The used SELECT statements have a different number of columns
Error1222
NameER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT
SQLSTATE21000
GroupServer errors

How to fix it

Explained step by step, with a query you can run
each UNION query must have the same number of columns

In other databases

Source: MySQL 8.4 Error Reference