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REPLACE
REPLACE [LOW_PRIORITY | DELAYED] [IGNORE] [INTO] tbl_name
{ [(col_name, ...)] VALUES (expression, ...), ...
| [(col_name, ...)] SELECT ...
| SET col_name=expression, col_name=expression, ... }
REPLACE is identical to INSERT,
except that if an inserted row clashes with an existing row in a PRIMARY
KEY or UNIQUE column, the old entry is replaced
with the new.
