Question

希望将另一个表加入到现有的工作示例中：

使用SQL：

SELECT u.UserName, u.LastName
     , (e.UserName IS NOT NULL) as user_exists_in_EnrollmentsTbl 
  FROM UsersDataTbl u
  LEFT 
  JOIN EnrollmentsTbl e
    ON u.UserName = e.UserName 
        AND e.ClassName LIKE 'Word%'
 WHERE u.Career = 1 AND Active = 1 ORDER BY u.LastName

我的尝试：

(SELECT u.UserName, u.LastName, d.Station
  , (e.UserName IS NOT NULL) as completedl 
  FROM UsersDataTbl u
  LEFT 
  JOIN EnrollmentsTbl e
    ON u.UserName = e.UserName 
        AND e.ClassName LIKE 'Word%') 
  INNER JOIN UsersDataCareerTbl d 
  ON u.UserName = d.UserName
  WHERE u.Career = 1 AND Active = 1 ORDER BY u.LastName

Answer 1

想通了：

SELECT u.UserName, u.LastName, d.Station, (e.UserName IS NOT NULL) as completed 
  FROM (UsersDataTbl u
INNER JOIN UsersDataCareerTbl d ON u.UserName = d.UserName)  
LEFT 
  JOIN EnrollmentsTbl e
    ON u.UserName = e.UserName 
        AND e.ClassName LIKE 'Word%' 
 WHERE u.Career = 1 AND Active = 1 ORDER BY u.LastName

将第二个表连接到工作示例

1 个答案: