sql 的join 经典-CFANZ编程社区

right

WITH Roster AS
 (SELECT 'Adams' as LastName, 50 as SchoolID UNION ALL
  SELECT 'Buchanan', 52 UNION ALL
  SELECT 'Coolidge', 52 UNION ALL
  SELECT 'Davis', 51 UNION ALL
  SELECT 'Eisenhower', 77),



TeamMascot AS
 (SELECT 50 as SchoolID, 'Jaguars' as Mascot UNION ALL
  SELECT 51, 'Knights' UNION ALL
  SELECT 52, 'Lakers' UNION ALL
  SELECT 53, 'Mustangs')



SELECT Roster.LastName  , TeamMascot.Mascot ,Roster.SchoolID as Rs,TeamMascot.SchoolID as Ts
FROM Roster  right JOIN TeamMascot ON Roster.SchoolID = TeamMascot.SchoolID;

sql 的join 经典_其它

left

WITH Roster AS
 (SELECT 'Adams' as LastName, 50 as SchoolID UNION ALL
  SELECT 'Buchanan', 52 UNION ALL
  SELECT 'Coolidge', 52 UNION ALL
  SELECT 'Davis', 51 UNION ALL
  SELECT 'Eisenhower', 77),



TeamMascot AS
 (SELECT 50 as SchoolID, 'Jaguars' as Mascot UNION ALL
  SELECT 51, 'Knights' UNION ALL
  SELECT 52, 'Lakers' UNION ALL
  SELECT 53, 'Mustangs')



SELECT Roster.LastName  , TeamMascot.Mascot ,Roster.SchoolID as Rs,TeamMascot.SchoolID as Ts
FROM Roster  left JOIN TeamMascot ON Roster.SchoolID = TeamMascot.SchoolID;

sql 的join 经典_其它_02

inner

WITH Roster AS
 (SELECT 'Adams' as LastName, 50 as SchoolID UNION ALL
  SELECT 'Buchanan', 52 UNION ALL
  SELECT 'Coolidge', 52 UNION ALL
  SELECT 'Davis', 51 UNION ALL
  SELECT 'Eisenhower', 77),



TeamMascot AS
 (SELECT 50 as SchoolID, 'Jaguars' as Mascot UNION ALL
  SELECT 51, 'Knights' UNION ALL
  SELECT 52, 'Lakers' UNION ALL
  SELECT 53, 'Mustangs')



SELECT Roster.LastName  , TeamMascot.Mascot ,Roster.SchoolID as Rs,TeamMascot.SchoolID as Ts
FROM Roster  inner JOIN TeamMascot ON Roster.SchoolID = TeamMascot.SchoolID;

sql 的join 经典_其它_03