通过删除光标

Speeading了查询我的查询，看起来像这样通过删除光标

declare @tmpTable Table(id int) 
insert into @tmpTable(id) values (3) 
insert into @tmpTable(id) values (5) 
insert into @tmpTable(id) values (11) 

declare @tmp int 
declare @finalString varchar(MAX) 

DECLARE c1 CURSOR READ_ONLY FOR SELECT ID FROM @tmpTable 
OPEN c1 
FETCH NEXT FROM c1 INTO @tmp 
set @finalString=cast(@tmp as varchar) 
FETCH NEXT FROM c1 INTO @tmp 
WHILE @@FETCH_STATUS = 0 
begin 
    set @[email protected]+','+cast(@tmp as varchar) 
    FETCH NEXT FROM c1 INTO @tmp 
end  
close c1 
deallocate c1 

select @finalString

我想创建一个字符串从表列值格式化这样“-3,5,11-”，此代码的工作，但有一个更好的方法来做到这一点？

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2011-04-08 Milos

是的。几种方法。建议您搜索SO ... – 2011-04-08 08:16:57

：http://stackoverflow.com/questions/1071022/fastest-way-to-loop-thru-a-sql-query – 2011-04-08 08:19:36

http://stackoverflow.com/questions/4019942/concatenating-string – 2011-04-08 08:20:23

当然 - 使用此方法（STUFF与FOR XML PATH合并）：

SELECT 
    STUFF((SELECT ','+CAST(id AS VARCHAR(10)) 
      FROM @tmpTable  
      FOR XML PATH('')), 1, 1, '')

返回的输出：

3,5,11

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2011-04-08 08:25:42

您可以使用CTE或XQuery。

CTE: 
with t1(rowNum, id) as 
(
    select rowNum, id from Temp1 
), 
t2(rowNum, str) as 
(
    select 1, cast(id as varchar(250)) from t1 where rowNum=1 
    union all 
    select t1.rowNum, str || ',' || cast(t1.id as varchar(3)) from t1,t2 
    where t2.rowNum+1 = t1.rowNum 
) 
select str from t2 order by rownum desc FETCH FIRST 1 ROWS ONLY;

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2011-04-08 08:33:47 massther

通过删除光标

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