0
code, attr, val, precedence
(0, 'key', 'value1', 1)
(1, 'key', 'value2', 1)
(2, 'key', 'value3', 1)
(3, 'key2', 'value1', 1)
(4, 'key3', 'value1', 1)
(5, 'key', 'nothis', 2)
(6, 'key', 'final_value', 3)
我想是這樣的:
(6, 'key', 'final_value', 3)
(3, 'key2', 'value1', 1)
(4, 'key3', 'value1', 1)
如何做到這一點,在MySQL的?