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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