--- Begin Message ---Hi all this is what Mysql Reference Manual tells me about creating foreign keys. I understood how to use them, except for the restrict here -------\ | [CONSTRAINT symbol] FOREIGN KEY (index_col_name, ...) | REFERENCES table_name (index_col_name, ...) | [ON DELETE {CASCADE | SET NULL | NO ACTION | | RESTRICT}] <----------------------X [ON UPDATE {CASCADE | SET NULL | NO ACTION | | RESTRICT}] <----------------------/WHat are they? what's the use of them ? Thank you ! Alx
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