MySQL ORDER BY 问题

Question

我试图在一个 SQL 声明中做太多事情。我想在输出 table 的适当位置获得小计和总计。这是我的 SQL;

SELECT Date, DOW, Week, Year, logdate, Month, monum, netID, Logins, 
       creds, newb, netCnt, TOD, netCnt, activity
  FROM (SELECT logdate
              ,activity
              ,DATE( logdate )                      AS Date
              ,DAYOFWEEK( logdate )         AS DOW
              ,WEEK( logdate,0 )              AS Week
              ,YEAR( logdate )              AS Year
              ,DATE_FORMAT( logdate, '%M' )         AS Month
              ,DATE_FORMAT( logdate, '%m' )     AS monum
              ,CONVERT( netID,UNSIGNED INTEGER )    AS netID
              ,COUNT( callsign )                    AS Logins
              ,COUNT( IF(creds <> '',1,NULL) )  AS creds
              ,COUNT( IF(comments LIKE '%first log in%',1,NULL) ) AS newb
              ,count( DISTINCT netID )      AS netCnt
              ,SUM(  DISTINCT netID)            AS allCnt
              ,SEC_TO_TIME( SUM(timeonduty) )       AS TOD
         FROM NetLog
        WHERE netID <> 0 
          AND activity NOT LIKE '%TEST%'
          AND netcall LIKE '%W0KCN%'
          AND substr(logdate,1,4) = 2017
    GROUP BY Month, netID WITH ROLLUP ) AS t 
    ORDER BY t.logdate , logins

（缩写）输出如下所示；

您会注意到每个月的顺序都是正确的，直到您到达 10 月。总计在 10 月之前而不是在结束时（12 月之后）进行排序。这是我可以在 SQL 中控制的东西，还是我应该在 PHP 中解决这个问题？我如何在 SQL 中修复它？

Answer 1

您的第二个字段 logins 将仅在第一个已排序列的相等值内进行相应排序。否则，排序优先于第一列。尝试交换 logdate 和 logins 看看会发生什么。

Answer 2

原来我需要一个 CASE 语句来让它工作。

SELECT Date, DOW, Week, Year,  Month, monum, netID, Logins, 
       creds, newb, netCnt, TOD, activity, logdate,
       COALESCE (Month, 'GT') as MonthNM
  FROM (SELECT logdate
              ,activity
              ,DATE( logdate )                      AS Date
              ,DAYOFWEEK( logdate )                 AS DOW
              ,WEEK( logdate,0 )                    AS Week
              ,YEAR( logdate )                      AS Year
              ,MONTHNAME ( logdate )                AS Month
              ,MONTH( logdate )                     AS monum
              ,CONVERT( netID,UNSIGNED INTEGER )    AS netID
              ,COUNT( callsign )                    AS Logins
              ,COUNT( IF(creds <> '',1,NULL) )      AS creds
              ,COUNT( IF(comments LIKE '%first log in%',1,NULL) ) AS newb
              ,count( DISTINCT netID )              AS netCnt
              ,SUM(  DISTINCT netID)                AS allCnt
              ,SEC_TO_TIME( SUM(timeonduty) )       AS TOD
         FROM NetLog
        WHERE netID <> 0 
          AND activity NOT LIKE '%TEST%'
          AND netcall LIKE '%W0KCN%'
          AND substr(logdate,1,4) = 2017
    GROUP BY Month, netID WITH ROLLUP ) AS t 
    ORDER BY 
     CASE
        WHEN MonthNM = 'GT' THEN  1
        ELSE 0
     END
        ,monum
        ,logins

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