On Duplicate Key Update Old Value

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Feb 4, 2017. ON DUPLICATE KEY UPDATE. NULL value can be assigned explicitly, adding a field into the field list, and specifying the key word. in a UNIQUE index or PRIMARY KEY , Valentina DB performs an UPDATE of the old row.

Jun 19, 2017. I was surprised to see that on duplicate key update clause works well if…. and a row is inserted that would cause a duplicate value in a UNIQUE index or PRIMARY KEY , MySQL performs an UPDATE of the old row.

REPLACE INTO my_table (col_1, col_2, col_3, col_4) VALUES. ON DUPLICATE KEY UPDATE col_1 = 'fixed_value' , col_2 = VALUES (col_2), value in a UNIQUE index or PRIMARY KEY, MySQL performs an UPDATE of the old row.