mysql多个值()包含，需要根据条件更新

Question

如果一列值等于某个值，我需要更新重复键上的字段。现在我有这样的东西:

INSERT INTO `table` (metric,amount,something1,something2)
VALUES              (metric,amount,something1,something2),
                    (metric,amount,something1,something2),
                    (metric,amount,something1,something2)
ON DUPLICATE KEY UPDATE 
amount = IF (metric = '6', amount = amount + ( '"+amount+"'),'')
         ELSEIF (metric = '8' ,     amount = amount + ( '"+impressions+"') ,'')  
         ELSEIF (metrtic = '11' ,   amount = amount + ( '"+impressions+"') ,'');

我在这里做错了什么？

Answer 1

如果我理解正确，您可以使用 UPDATE 、 self JOIN 和 CASE WHEN

[DUPLICATE KEY]可以填写您要检查的DUPLICATE列。

UPDATE `table` r
JOIN (
    SELECT Count(*) cnt,[DUPLICATE KEY] 
    from `table`
    group by [DUPLICATE KEY]
) t1 on r.[DUPLICATE KEY] = t1.[DUPLICATE KEY] and t1.cnt > 1
SET r.amount = (CASE WHEN r.metric = '6' THEN r.amount+ ( '"+amount+"'),'' 
                  WHEN r.metric = '8' THEN r.amount + ( '"+impressions+"') ,''
                  WHEN r.metric = '11' THEN r.amount+ ( '"+impressions+"') ,''
                  ELSE r.amount
            END)