[英]MySql different order by conditions
我有我的MySQL查詢
SELECT `adddate`, `pexpdate`, `level` FROM `localhost-tests` WHERE 1 ORDER BY `level` DESC, `pexpdate` DESC, `adddate` DESC
還給我
問題是,如果級別> 0的部分很好,並按pexpdate排序,則級別= 0的第二部分必須按adddate而不是pexpdate排序。
我試過了:
WHERE 1 ORDER BY ORDER BY `level` desc, `PExpDate` desc, `AddDate` desc
WHERE 1 ORDER BY IF(`level`, `PExpDate`, `AddDate`) DESC
WHERE 1 ORDER BY level DESC, ifnull(PExpDate, AddDate) DESC LIMIT 5
問題:如何通過adddate對level = 0的部分結果進行排序。
首先, WHERE 1
部分沒有用。 您不需要WHERE
來指定ORDER
子句。
然后,使用UNION
。
SELECT `adddate`, `pexpdate`, `level` FROM `localhost-tests` WHERE `level` <> 0 ORDER BY `level` DESC, `pexpdate` DESC, `adddate` DESC
UNION
SELECT `adddate`, `pexpdate`, `level` FROM `localhost-tests` WHERE `level` = 0 ORDER BY `adddate` DESC
您可以使用UNION
SELECT `adddate`, `pexpdate`, `level` FROM `localhost-tests` WHERE `level`>0 ORDER BY `level` DESC, `pexpdate` DESC
UNION
SELECT `adddate`, `pexpdate`, `level` FROM `localhost-tests` WHERE `level`=0 ORDER BY `adddate`
嘗試不帶UNION
SELECT `adddate`, `pexpdate`, `level` FROM `localhost-tests`
ORDER BY CASE WHEN `level`>0 THEN `level` , `pexpdate` , `adddate`
WHEN `level`=0 THEN `adddate`
END DESC
解決方案很簡單,將2列相乘並按結果排序
SELECT *, `level` * UNIX_TIMESTAMP(`pexpdate`) as `BonusDate` FROM `localhost-tests` WHERE 1 ORDER BY `BonusDate` DESC, `adddate` DESC
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