Sql server 动态SQL Pivot:基于列值创建新列并解析列名
使用以下代码:Sql server 动态SQL Pivot:基于列值创建新列并解析列名,sql-server,tsql,pivot,dynamic-sql,Sql Server,Tsql,Pivot,Dynamic Sql,使用以下代码: create table temp ( date datetime, category varchar(3), amount money ) insert into temp values ('1/1/2012', 'ABC', 1000.00) insert into temp values ('2/1/2012', 'DEF', 500.00) insert into temp values ('2/1/2012', 'GHI', 800.00) i
create table temp
(
date datetime,
category varchar(3),
amount money
)
insert into temp values ('1/1/2012', 'ABC', 1000.00)
insert into temp values ('2/1/2012', 'DEF', 500.00)
insert into temp values ('2/1/2012', 'GHI', 800.00)
insert into temp values ('2/10/2012', 'DEF', 700.00)
insert into temp values ('3/1/2012', 'ABC', 1100.00)
DECLARE @cols AS NVARCHAR(MAX),
@query AS NVARCHAR(MAX);
SET @cols = STUFF((SELECT distinct ',' + QUOTENAME(c.category)
FROM temp c
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = 'SELECT date, ' + @cols + ' from
(
select date
, amount
, category
from temp
) x
pivot
(
max(amount)
for category in (' + @cols + ')
) p '
execute(@query)
drop table temp
我得到的结果如下:
Date ABC DEF GHI
2012-01-01 00:00:00.000 1000.00 NULL NULL
2012-02-01 00:00:00.000 NULL 500.00 800.00
2012-02-10 00:00:00.000 NULL 700.00 NULL
2012-03-01 00:00:00.000 1100.00 NULL NULL
但是,我的列值命名约定不同。例如,我的数据集可能如下所示:
create table temp
(
date datetime,
category varchar(3),
amount money
)
insert into temp values ('1/1/2012', 'ABC-CO', 1000.00)
insert into temp values ('2/1/2012', 'DEF', 500.00)
insert into temp values ('2/1/2012', 'GHI', 800.00)
insert into temp values ('2/10/2012', 'DEF', 700.00)
insert into temp values ('3/1/2012', 'ABC-PR', 1100.00)
“-CO”和“-PR”可以出现在任何值之后,而不仅仅是“ABC”。但我需要做的是,当任何列标题出现时,从中删除“-%”,以便创建与上面相同的结果表。有人知道该怎么做吗?请注意,“ABC-CO”不能存储在varchar(3)字段中-您需要varchar(6) 如果'-CO'和'-PR'是唯一的后缀,则可以使用REPLACE函数:
create table temp
(
date datetime,
category varchar(6),
amount money
)
insert into temp values ('1/1/2012', 'ABC-CO', 1000.00)
insert into temp values ('2/1/2012', 'DEF', 500.00)
insert into temp values ('2/1/2012', 'GHI-PR', 800.00)
insert into temp values ('2/10/2012', 'DEF', 700.00)
insert into temp values ('3/1/2012', 'ABC', 1100.00)
DECLARE @cols AS NVARCHAR(MAX),
@query AS NVARCHAR(MAX);
SET @cols = STUFF((SELECT distinct ',' + QUOTENAME(REPLACE(REPLACE(c.category, '-PR',''),'-CO',''))
FROM temp c
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,1,'')
set @query = 'SELECT date, ' + @cols + ' from
(
select date
, amount
, REPLACE(REPLACE(category, ''-PR'',''''),''-CO'','''') as category
from temp
) x
pivot
(
max(amount)
for category in (' + @cols + ')
) p '
execute(@query)
drop table temp