我在 MySql 服务器上运行的查询遇到问题。 这是查询:
SELECT itms.Gender,itms.Age, (CASE WHEN (plv.Discount = 0 OR t1.EverGreen = 1) THEN 'A' ELSE 'S' END) as SCode, itms.SubLineID, min(t1.DayDelivery)
FROM item as t1
INNER JOIN item_contest_summary as itms
on (t1.SeasonID=itms.SeasonID and t1.CollectionID=itms.CollectionID and t1.ItemID=itms.ItemID and itms.JoinType<2)
INNER JOIN pricelist_summary as plc
on (plc.CountryID = 'IT' AND plc.SeasonID = itms.PriceSeasonID AND plc.CollectionID = itms.PriceCollectionID AND plc.ItemID = itms.PriceItemID )
INNER JOIN pricelist AS plv
on (plv.ListCode = plc.ListCode AND plv.SeasonID = itms.PriceSeasonID AND plv.CollectionID = itms.PriceCollectionID AND plv.ItemID = itms.PriceItemID AND (plv.ListPrice > 0 or itms.IsGAG))
WHERE itms.SCode IN ('S', 'A') AND itms.Age in ('A','K','') AND t1.HasPrivateSale = 0 AND itms.ExclLista = 0 AND itms.IsGAG = 0
GROUP BY itms.Gender,itms.Age,
(CASE WHEN (plv.Discount = 0 OR t1.EverGreen = 1) THEN 'A' ELSE 'S' END),
itms.SubLineID
当我们在服务器上禁用严格sql(版本5.1)时,该语句曾经工作正常,然后我们将系统升级到5.6,启用严格sql模式,问题就来了。 此查询的问题似乎是 case when 部分中的表达式:
(plv.Discount = 0 OR t1.EverGreen = 1)
仅使用 OR 中的两个表达式之一,一切正常(保留第一个和第二个表达式)。 似乎不可能在 case when 子句使用的表达式内使用任何 AND/OR/等。为什么? 还有其他方法可以编写这种查询吗?
编辑:
这是我收到的响应错误:
Error Code: 1055. 'plv.Discount' isn't in GROUP BY
最佳答案
我发现使用别名进行分组效果非常好。 因此,工作查询是:
SELECT itms.Gender,itms.Age,
(CASE WHEN (plv.Discount = 0 OR t1.EverGreen = 1) THEN 'A' ELSE 'S' END) as SCode,
itms.SubLineID , min(t1.DayDelivery)
FROM item as t1
INNER JOIN item_contest_summary as itms
on (t1.SeasonID=itms.SeasonID and t1.CollectionID=itms.CollectionID and t1.ItemID=itms.ItemID and itms.JoinType<2)
INNER JOIN pricelist_summary as plc
on (plc.CountryID = 'IT' AND plc.SeasonID = itms.PriceSeasonID AND plc.CollectionID = itms.PriceCollectionID AND plc.ItemID = itms.PriceItemID )
INNER JOIN pricelist AS plv
on (plv.ListCode = plc.ListCode AND plv.SeasonID = itms.PriceSeasonID AND plv.CollectionID = itms.PriceCollectionID AND plv.ItemID = itms.PriceItemID AND (plv.ListPrice > 0 or itms.IsGAG))
WHERE itms.SCode IN ('S', 'A') AND itms.Age in ('A','K','') AND t1.HasPrivateSale = 0 AND itms.ExclLista = 0 AND itms.IsGAG = 0
GROUP BY itms.Gender,itms.Age,
SCode,
itms.SubLineID
我仍然不明白为什么只有在 case when 语句中使用复杂表达式时才需要这样做。 此外,即使 select 上没有聚合函数,此版本的查询也能正常工作。 问题解决了,但还是很困惑...
关于mysql - 当在 mysql 5.6 严格 sql 模式下不起作用时,按情况分组,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/28475097/