php - MySQL 使用不同的 where 子句更新 3 列

Question

我有 6 列的表 - ROW1a、ROW1b、ROW2a、ROW2b、ROW3a、ROW3b。

如何更新 ROW1a WHERE ROW1b = 1 AND ROW2a WHERE ROW2b = 2 AND ROW3a WHERE ROW3b = 3

Answer 1

您需要 3 个UPDATE语句：

UPDATE `table` SET ROW1a = 'something' WHERE ROW1b = 1

UPDATE `table` SET ROW2a = 'something' WHERE ROW2b = 1

UPDATE `table` SET ROW3a = 'something' WHERE ROW3b = 1

Answer 2

最佳 3 更新。

或使用

UPDATE table
SET ROW1a = IF(ROW1b, ..., ROW1a),
    ROW2a = IF(ROW2b, ..., ROW2a),
    ROW3a = IF(ROW2b, ..., ROW3a)
WHERE ROW1b OR ROW2b OR ROW3b

Answer 3

您需要对每个条件进行更新。

UPDATE table_name
   SET ROW1a=value
 WHERE ROW1b=1;

UPDATE table_name
   SET ROW2a=value
 WHERE ROW2b=2;

(...)