1.行列转换
--测试环境
Create table T(日期 datetime,时间 varchar(20),售货金额 int)
insert into T select '2006-01-02','早上',50
union all select '2006-01-02','中午',20
union all select '2006-01-02','晚上',30
union all select '2006-01-02','零晨',40
union all select '2006-01-03',60
union all select '2006-01-03',50
union all select '2006-01-03',50
union all select '2006-01-04',80
union all select '2006-01-04',60
union all select '2006-01-04',20
union all select '2006-01-04',40
--查询
select *,金额小计=(select sum(售货金额) from T where 日期=PT.日期 ) from T as TAB
PIVOT
( max(售货金额)
for 时间 in ([早上],[中午],[晚上],[零晨])
) as PT
--结果
/*
日期 早上 中午 晚上 零晨 金额小计
----------------------- ----------- ----------- ----------- ----------- -----------
2006-01-02 00:00:00.000 50 20 30 40 140
2006-01-03 00:00:00.000 40 60 50 50 200
2006-01-04 00:00:00.000 80 60 20 40 200
(3 行受影响)
*/
2.xml处理
测试环境
Create table tb_test(id int,value varchar(20))
insert into tb_test(id,value) values (1,'aaa');
insert into tb_test(id,'bbb');
insert into tb_test(id,'ccc');
sql-------
select distinct id,[values]=stuff((select ','+[value] from tb_test t where id=tb_test.id
for xml path('')),1,'')
from tb_test
测试结果：
id values
1 aaa,bbb
2 vvv
(2 row(s) affected)
