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关于数据库随机查询问题

2007-02-14 15:21 302 查看

IF EXISTS(SELECT name

FROM sysobjects

WHERE name = N'T'

AND type = 'U')

DROP TABLE T

CREATE TABLE T (

C1 INT,

C2 CHAR(8),

C3 CHAR(8)

)

INSERT INTO T

SELECT 1,'AA','K' UNION ALL

SELECT 2,'AA','L' UNION ALL

SELECT 3,'BB','K' UNION ALL

SELECT 4,'BB','L' UNION ALL

SELECT 5,'CC','K' UNION ALL

SELECT 6,'CC','L' UNION ALL

SELECT 7,'DD','K' UNION ALL

SELECT 8,'DD','L' UNION ALL

SELECT 9,'EE','K' UNION ALL

SELECT 10,'FF','L'

select * from t

select C1,

CD=(select Case C2 when 'AA' then 10

when 'BB' then 20

when 'CC' then 30

when 'DD' then 40

when 'EE' then 50

when 'FF' then 60 end from t t1 where t1.c1=t3.c1 group by C2)*10

+(select Case C3 when 'K' then 1

when 'L' then 2 end from t t2 where t2.c1=t3.c1 group by C3),C2,C3 from t t3

select top 1 newid(), * from t order by newid()

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标签： 数据库 go table insert c

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