Question

以下是存储过程中的SQL语句，它返回记录正常。但是，我还需要MEMBER_ID的值。当我将它添加到select语句时，则不返回任何记录。我尝试过CAST和CONVERT，但没有结果。作为参考，字段MEMBER_ID是两个表中的键值。这是一个INT。

SELECT
  CONCAT(WEBFSS.MEMBERS.LAST_NAME, ", " ,WEBFSS.MEMBERS.FIRST_NAME) As Name,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _mon THEN WEBFSS.SCHEDULE.QTY END) AS MEALS1,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _mon THEN WEBFSS.SCHEDULE.ENSURE END) AS ENS1,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _tue THEN WEBFSS.SCHEDULE.QTY END) AS MEALS2,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _tue THEN WEBFSS.SCHEDULE.ENSURE END) AS ENS2,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _wed THEN WEBFSS.SCHEDULE.QTY END) AS MEALS3,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _wed THEN WEBFSS.SCHEDULE.ENSURE END) AS ENS3, 
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _thu THEN WEBFSS.SCHEDULE.QTY END) AS MEALS4,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _thu THEN WEBFSS.SCHEDULE.ENSURE END) AS ENS4,   
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _fri THEN WEBFSS.SCHEDULE.QTY END) AS MEALS5,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _fri THEN WEBFSS.SCHEDULE.ENSURE END) AS ENS5
 FROM WEBFSS.SCHEDULE
  INNER JOIN WEBFSS.MEMBERS
    ON WEBFSS.SCHEDULE.MEMBER_ID = WEBFSS.MEMBERS.MEMBER_ID
WHERE
  (WEBFSS.SCHEDULE.DATE BETWEEN _mon AND _fri) 
GROUP BY
 WEBFSS.MEMBERS.LAST_NAME, WEBFSS.MEMBERS.FIRST_NAME ;

这不起作用：

SELECT
  SCHEUDLE.MEMBER_ID,
  CONCAT(WEBFSS.MEMBERS.LAST_NAME, ", " ,WEBFSS.MEMBERS.FIRST_NAME) As Name,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _mon THEN WEBFSS.SCHEDULE.QTY END) AS MEALS1,

Answer 1

尝试按SCHEUDLE.MEMBER_ID和CONCAT(WEBFSS.MEMBERS.LAST_NAME, ", " ,WEBFSS.MEMBERS.FIRST_NAME)分组：

SELECT
  SCHEUDLE.MEMBER_ID,
  CONCAT(WEBFSS.MEMBERS.LAST_NAME, ", " ,WEBFSS.MEMBERS.FIRST_NAME) As Name,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _mon THEN WEBFSS.SCHEDULE.QTY END) AS MEALS1,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _mon THEN WEBFSS.SCHEDULE.ENSURE END) AS ENS1,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _tue THEN WEBFSS.SCHEDULE.QTY END) AS MEALS2,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _tue THEN WEBFSS.SCHEDULE.ENSURE END) AS ENS2,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _wed THEN WEBFSS.SCHEDULE.QTY END) AS MEALS3,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _wed THEN WEBFSS.SCHEDULE.ENSURE END) AS ENS3, 
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _thu THEN WEBFSS.SCHEDULE.QTY END) AS MEALS4,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _thu THEN WEBFSS.SCHEDULE.ENSURE END) AS ENS4,   
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _fri THEN WEBFSS.SCHEDULE.QTY END) AS MEALS5,
  SUM(CASE WHEN WEBFSS.SCHEDULE.DATE = _fri THEN WEBFSS.SCHEDULE.ENSURE END) AS ENS5
 FROM WEBFSS.SCHEDULE
  INNER JOIN WEBFSS.MEMBERS
    ON WEBFSS.SCHEDULE.MEMBER_ID = WEBFSS.MEMBERS.MEMBER_ID
WHERE
  (WEBFSS.SCHEDULE.DATE BETWEEN _mon AND _fri) 
GROUP BY SCHEUDLE.MEMBER_ID, CONCAT(WEBFSS.MEMBERS.LAST_NAME, ", " ,WEBFSS.MEMBERS.FIRST_NAME);

当你在select中包含一个聚合函数时，如果没有包含在group by中的额外列，那么mysql将为那些既不包含在聚合函数中也不包含在group by子句中的列选择随机值。

SQL语句问题

1 个答案: