需要SQL逻辑可能子查询需要

我正在构建一个查询，我需要从MEMBERS表中检索所有记录，其中连接日期（datejoin）在两个日期之间，某个成员资格类型（mtypeid）之一和从一个特定的位置（siteid）。需要SQL逻辑可能子查询需要

然后，我需要从SCSCHEDULER（此表存储所有约会）表中撤回所有预定过去某个日期的成员的约会，具有某种类型的约会，并且仍然是活性。

我有以下，但我相信我需要在子查询中放置一些这种逻辑，因为我只为具有约会的成员返回数据。我需要至少为没有任何约会的成员以及那些有约会的成员和scscheduler数据从成员表中返回数据。

SELECT  MEMBERS.scancode, MEMBERS.lname, MEMBERS.fname, MEMBERTYPES.description, MEMBERS.status, MEMBERS.datejoin, EMPLOYEES.lname AS Expr1, 
         EMPLOYEES.fname AS Expr2, SCSCHEDULES.scheduledatefrom, SCSCHEDULES.timeduration, SCSCHEDULES.scheduledescription, 
         SCSCHEDULES.schedulestatus 
FROM   MEMBERS LEFT OUTER JOIN 
         SCSCHEDULES ON MEMBERS.memid = SCSCHEDULES.memid INNER JOIN 
         MEMBERTYPES ON MEMBERS.mtypeid = MEMBERTYPES.mtypeid INNER JOIN 
         EMPLOYEES ON MEMBERS.employeeid = EMPLOYEES.employeeid 
WHERE  (MEMBERS.datejoin BETWEEN @rvStartDate AND @rvEndDate) AND (MEMBERS.siteid = '779') AND (MEMBERS.mtypeid = '1' OR 
         MEMBERS.mtypeid = '10' OR 
         MEMBERS.mtypeid = '12' OR 
         MEMBERS.mtypeid = '28' OR 
         MEMBERS.mtypeid = '32' OR 
         MEMBERS.mtypeid = '33' OR 
         MEMBERS.mtypeid = '34' OR 
         MEMBERS.mtypeid = '35' OR 
         MEMBERS.mtypeid = '36' OR 
         MEMBERS.mtypeid = '40' OR 
         MEMBERS.mtypeid = '48') AND (SCSCHEDULES.scheduledatefrom >= @rvStartDate) AND (SCSCHEDULES.scheduledescription = 'First' OR 
         SCSCHEDULES.scheduledescription = 'Second') AND (SCSCHEDULES.schedulestatus = '1')

来源

2016-07-05 Merlin

注意@Merlin，你可以通过使用IN（）来缩短你的'WHERE MEMEBER.mtypeid = ...或...'。打字少了很多。 https://msdn.microsoft.com/en-us/library/ms177682.aspx – scsimon

当您尝试WHERE子句中筛选对SCSCHEDULES（等后外连接），你最终会下降，你想保持行。他们需要被放置在连接条件或包裹起来派生表如下内：

SELECT m.scancode, m.lname, m.fname, mt.description, m.status, m.datejoin, 
     e.lname AS Expr1, e.fname AS Expr2, 
     s.scheduledatefrom, s.timeduration, s.scheduledescription, s.schedulestatus 
FROM MEMBERS AS m 
     LEFT OUTER JOIN 
     (
     SELECT * FROM SCSCHEDULES 
     WHERE 
       scheduledatefrom >= @rvStartDate 
      AND scheduledescription IN ('First', 'Second') 
      AND schedulestatus = '1' 
     ) AS s 
      ON m.memid = s.memid 
     INNER JOIN MEMBERTYPES AS mt 
      ON m.mtypeid = mt.mtypeid 
     INNER JOIN EMPLOYEES AS e 
      ON m.employeeid = e.employeeid 
WHERE  m.datejoin BETWEEN @rvStartDate AND @rvEndDate 
     AND m.siteid = '779' 
     AND m.mtypeid IN (
      '1', '10', '12', '28', '32', '33', '34', '35', '36', '40, '48' 
     );

来源

2016-07-05 20:23:34 shawnt00

在LEFT JOIN，环境对所有的，但第一个表应ON子句中去，而不是WHERE条款：

SELECT m.scancode, m.lname, m.fname, mt.description, m.status, m.datejoin, 
     e.lname AS Expr1, e.fname AS Expr2, 
     s.scheduledatefrom, s.timeduration, s.scheduledescription, s.schedulestatus 
FROM MEMBERS m LEFT OUTER JOIN 
    SCSCHEDULES s 
    ON MEMBERS.memid = s.memid AND scheduledatefrom >= @rvStartDate AND 
     scheduledescription IN ('First', 'Second') AND 
     schedulestatus = '1' INNER JOIN 
    MEMBERTYPES mt 
    ON m.mtypeid = mt.mtypeid INNER JOIN 
    EMPLOYEES e 
    ON m.employeeid = e.employeeid 
WHERE m.datejoin BETWEEN @rvStartDate AND @rvEndDate AND 
     m.siteid = '779' AND 
     m.mtypeid IN ('1', '10', '12', '28', '32', '33', '34', '35', '36', '40, '48');

注意：如果您的ID是数字，那么您应该删除单引号。混合类型可能会混淆优化器。

另请注意，表别名使查询更易于编写和读取。

来源

2016-07-05 22:20:32

需要SQL逻辑可能子查询需要

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