は、既存の作業例に別のテーブルを結合するために探して実施例

Question

に2つ目のテーブルのJOIN：

ワーキング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 

私の試みを：

(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

はそれを考え出した：

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