Sql server 假表左连接

1.

select k1,name1,k2,name2 from(select '2'as k1, 'fan' as name1) as a
left join
(select k2,name2 from(select '2'as k2, 'hui' as name2) as b) as c
on a.k1 = c.k2

 

 

 

2.

SELECT M.TITLE, WEEK1,w1,w2 from(
SELECT * FROM(
 SELECT
 '前年販売数' AS TITLE,
 '' AS WEEK1,
 '' AS WEEK2,
 '' AS WEEK3,
 '' AS WEEK4,
 '' AS WEEK5,
 '' AS WEEK6,
 '' AS WEEK7,
 '' AS WEEK8,
 '' AS WEEK9,
 '' AS WEEK10,
 '' AS WEEK11,
 '' AS WEEK12,
 '' AS WEEK13,
 '' AS WEEK14,
 '' AS WEEK15,
 '' AS WEEK16,
 '' AS WEEK17,
 '' AS WEEK18,
 '' AS WEEK19,
 '' AS WEEK20,
 '' AS WEEK21,
 '' AS WEEK22,
 '' AS WEEK23,
 '' AS WEEK24,
 '' AS WEEK25,
 '' AS WEEK26,
 '' AS WEEK27,
 '' AS WEEK28,
 '' AS WEEK29,
 '' AS WEEK30,
 '' AS T1,
 '' AS T2,
 '' AS T3,
 '' AS T4,
 '' AS T5
) AS T1
 UNION ALL
 SELECT * FROM(
 SELECT
 '当年販売数' AS TITLE,
 '' AS WEEK1,
 '' AS WEEK2,
 '' AS WEEK3,
 '' AS WEEK4,
 '' AS WEEK5,
 '' AS WEEK6,
 '' AS WEEK7,
 '' AS WEEK8,
 '' AS WEEK9,
 '' AS WEEK10,
 '' AS WEEK11,
 '' AS WEEK12,
 '' AS WEEK13,
 '' AS WEEK14,
 '' AS WEEK15,
 '' AS WEEK16,
 '' AS WEEK17,
 '' AS WEEK18,
 '' AS WEEK19,
 '' AS WEEK20,
 '' AS WEEK21,
 '' AS WEEK22,
 '' AS WEEK23,
 '' AS WEEK24,
 '' AS WEEK25,
 '' AS WEEK26,
 '' AS WEEK27,
 '' AS WEEK28,
 '' AS WEEK29,
 '' AS WEEK30,
 '' AS T1,
 '' AS T2,
 '' AS T3,
 '' AS T4,
 '' AS T5
) AS T2
) as M
left join
(
SELECT TITLE,w1,w2 FROM(
 SELECT
 '前年販売数' AS TITLE,
 '1' AS W1,
 '2' AS W2
) AS N
) AS N1
on M.TITLE = N1.TITLE