mysql check constraint code example

Example 1: mysql find db contarint

select *
from information_schema.key_column_usage
where constraint_name='[CONSTRAINT_NAME]'

Example 2: check constraint is violated

CONSTRAINT ck_ni_number
  CHECK (REGEXP_LIKE(ni_number, '[a-z][a-z][0-9][0-9][0-9][0-9][0-9][0-9][a-z]'))

Example 3: mysql show check constraints

select COLUMN_NAME, CONSTRAINT_NAME, REFERENCED_COLUMN_NAME, REFERENCED_TABLE_NAME
from information_schema.KEY_COLUMN_USAGE
where TABLE_NAME = 'users';

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