0
DECLARE @a TABLE (code INT, aname VARCHAR(10))
INSERT INTO @a(code, aname) SELECT 1,'A'
INSERT INTO @a(code, aname) SELECT 2,'B'
INSERT INTO @a(code, aname) SELECT 3,'C'
DECLARE @b TABLE (code INT, bname VARCHAR(10))
INSERT INTO @b(code, bname) SELECT 1,'aaa'
INSERT INTO @b(code, bname) SELECT 1,'bbb'
INSERT INTO @b(code, bname) SELECT 2,'ccc'
INSERT INTO @b(code, bname) SELECT 2,'ddd'
DECLARE @c TABLE (code INT, cname VARCHAR(10))
INSERT INTO @c(code, cname) SELECT 1,'xxx'
INSERT INTO @c(code, cname) SELECT 1,'yyy'
INSERT INTO @c(code, cname) SELECT 1,'zzz'
INSERT INTO @c(code, cname) SELECT 2,'www'
我需要下面的輸出如何編寫產生從下面的表下面的輸出查詢
code aname bname cname
----------- ---------- ---------- ----------
1 A aaa xxx
1 A bbb yyy
1 A NULL zzz
2 B ccc www
2 B ddd NULL
3 C NULL NULL
我嘗試此查詢,但它不工作
SELECT * FROM @a as a
LEFT JOIN @b b On b.code = a.code
LEFT JOIN @C c on c.Code = A.Code
你的查詢是正確的,只有一個問題是有代碼id 3我只需要一行。 –
感謝它爲我工作。 –