mysql on delete set null

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Mirko
21 Apr 2020
1SET foreign_key_checks = 0;
2UPDATE languages SET id='xyz' WHERE id='abc';
3UPDATE categories_languages SET language_id='xyz' WHERE language_id='abc';
4SET foreign_key_checks = 1;
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Lya
10 Feb 2016
1
2    FOREIGN KEY (child_col1, child_col2, ... child_col_n)
3    REFERENCES parent_table (parent_col1, parent_col2, ... parent_col_n)
4    ON DELETE SET NULL
5    [ ON UPDATE { NO ACTION | CASCADE | SET NULL | SET DEFAULT } ] 
6
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