SQL交叉表實(shí)例

很簡單的一個(gè)東西,，見網(wǎng)上好多朋友問“怎么實(shí)現(xiàn)交叉表？”,，以下是我寫的一個(gè)例子,，數(shù)據(jù)庫基于SQL SERVER 2000。

-- ======================================================
--交叉表實(shí)例
-- ======================================================

建表：

在查詢分析器里運(yùn)行：
CREATE TABLE [Test] (
[id] [int] IDENTITY (1, 1) NOT NULL ,
[name] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[subject] [nvarchar] (50) COLLATE Chinese_PRC_CI_AS NULL ,
[Source] [numeric](18, 0) NULL
) ON [PRIMARY]
GO

INSERT INTO [test] ([name],[subject],[Source]) values (N‘張三‘,N‘語文‘,60)
INSERT INTO [test] ([name],[subject],[Source]) values (N‘李四‘,N‘?dāng)?shù)學(xué)‘,70)
INSERT INTO [test] ([name],[subject],[Source]) values (N‘王五‘,N‘英語‘,80)
INSERT INTO [test] ([name],[subject],[Source]) values (N‘王五‘,N‘?dāng)?shù)學(xué)‘,75)
INSERT INTO [test] ([name],[subject],[Source]) values (N‘王五‘,N‘語文‘,57)
INSERT INTO [test] ([name],[subject],[Source]) values (N‘李四‘,N‘語文‘,80)
INSERT INTO [test] ([name],[subject],[Source]) values (N‘張三‘,N‘英語‘,100)

Go

交叉表語句的實(shí)現(xiàn)：
--用于：交叉表的列數(shù)是確定的（用了這個(gè)很不錯(cuò)?。?br>select name,sum(case subject when ‘?dāng)?shù)學(xué)‘ then source else 0 end) as ‘?dāng)?shù)學(xué)‘,
sum(case subject when ‘英語‘ then source else 0 end) as ‘英語‘,
sum(case subject when ‘語文‘ then source else 0 end) as ‘語文‘
from test
group by name


--用于：交叉表的列數(shù)是不確定的

不確定列,，字段2的值范圍不固定。

create table a
(id VARchar(4),
F2 VARCHAR(2),
F3 INT)

insert a(ID,F2,F3)
select ‘A001‘,‘01‘,12
UNION ALL SELECT ‘A001‘,‘02‘,24
UNION ALL SELECT ‘A002‘,‘01‘,10
UNION ALL SELECT ‘A002‘,‘03‘,5
UNION ALL SELECT ‘A003‘,‘02‘,6
UNION ALL SELECT ‘A004‘,‘04‘,13


--SELECT * FROM A


--不確定列數(shù)
declare @sql varchar(8000)
set @sql = ‘select ID,‘
select @sql = @sql + ‘sum(case F2 when ‘‘‘ +F2+‘‘‘
then F3 else ‘‘‘‘ end) as ‘‘‘+ ‘字段(‘+F2+‘)‘‘,‘
from (select distinct F2 from A) as B
select @sql = left(@sql,len(@sql)-1) + ‘ from A group by ID‘

--PRINT @SQL
exec(@sql)

go

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交叉表：