sql循环语句怎么写

Transact-SQL附加语言Transact-SQL附加语言元素不是SQL的标准内容，而是Transact-SQL语言为了编程方便而增加的语言元素。

这些语言元素包括变量、运算符、函数、流程控制语句和注释等内容。1. 变量变量对1种语言来讲是必不可少的组成部份。

Transact-SQL语言允许使用两种变量：1种是用户自己定义的局部变量（Local Variable），另外一种是系统提供的全局变量（Global Variable）。(1) 局部变量局部变量使用户自己定义的变量，它的作用范围近在程序内部。

通常只能在1个批处理中或存储进程中使用，用来存储从表中查询到的数据，或当作程序履行进程中暂存变量使用。局部变量使用DECLARE语句定义，并且指定变量的数据类型，然后可使用SET或SELECT语句为变量初始化；局部变量必须以“@”开头，而且必须先声明后使用。

其声明格式以下：DECLARE @变量名 变量类型[，@变量名 变量类型…]其中变量类型可以是SQL Server 2000支持的所有数据类型，也能够是用户自定义的数据类型。局部变量不能使用“变量=变量值”的格式进行初始化，必须使用SELECT或SET语句来设置其初始值。

初始化格式以下：SELECT @局部变量=变量值SET @局部变量=变量值。

**************

修改了一下：

**************

declare @month_tmp varchar(2);

declare @day_tmp varchar(2);

set @month_tmp = '1';

set @day_tmp = '1';

while(@month_tmp < '13')

begin

while(@day_tmp < '30')

begin

select * from table1 where month=@month_tmp and day=@day_tmp

set @day_tmp = @day_tmp + 1

end

set @month_tmp = @month_tmp + 1

set @day_tmp = 1

end

*********************************************************

select * from table1 where

month in('1','2','3','4','5','6','7','8','9','10','11','12'

and

day in('1','2','3','4','5','6','7','8','9','10','11','12','13','14','15','16','17','18','19','20','21','22','23','24','25','26','27','28','29','30');

---

以上，希望对你有所帮助。

declare

sql_tem Varchar2(4000);

a number;

b number;

i number;

begin

a := 1;

for i in 1 .. 3 loop

b := a + 4;

sql_tem := 'insert into A2 (ID,NAME) (select ID,NAME from A1 WHERE ROWNUM between :1 and :2)';

EXECUTE IMMEDIATE sql_tem

USING a, b;

commit;

a := a + 5;

end loop;

end;

试试上面的代码看一下能不能满意你的要求先呗。

tsql（就是sqlserver的），亲测成功：-----------------------------------declare @res varchar(100)declare @c varchar(10)set @res=''declare c1 cursor for select B from topen c1fetch next from c1 into @cwhile @@fetch_status=0begin set @res=@res+@c fetch next from c1 into @cendclose c1deallocate c1select @res。

DECLARE @IDS VARCHAR(100)

SET @IDS = '100,200,30,8,3459,1'

DECLARE @ID INT

DECLARE @INDEX INT

WHILE LEN(@IDS) > 0

BEGIN

SET @INDEX = CHARINDEX(',',@IDS,1)

IF @INDEX > 1

BEGIN

SET @ID = CAST(LEFT(@IDS,@INDEX - 1) AS INT)

SET @IDS = SUBSTRING(@IDS,@INDEX+1, LEN(@IDS) - @INDEX)

END

ELSE

BEGIN

SET @ID = CAST(@IDS AS INT)

SET @IDS = NULL

END

INSERT INTO TABLES(ID) VALUES(@ID)

SET @INDEX = CHARINDEX(',',@IDS,1)

END

create table a_lyh_test

as

select 'A' as "字段1" , 500 as "字段2" from dual

union all

select 'B' as "字段1" , 300 as "字段2" from dual

union all

select 'B' as "字段1" ,400 as "字段2" from dual

union all

select 'B' as "字段1" , 600 as "字段2" from dual

union all

select 'A' as "字段1" , 200 as "字段2" from dual

;

select f.字段1

,ltrim(max(sys_connect_by_path(f.字段2,','))

keep (dense_rank last order by f.pnum),',') as 字段2

from

(

select t.字段1

,t.字段2

,row_number() over(partition by t.字段1 order by t.字段1) as pnum

,row_number() over(partition by t.字段1 order by t.字段1)-1 as lnum

from

(

select a.字段1,a.字段2

from a_lyh_test a

) t

) f

group by f.字段1

connect by f.lnum = prior f.pnum and f.字段1 = prior f.字段1

start with f.pnum = 1;

可以使用游标。MS SQL语句如下：

--定义一个接收数值及一个累加数值的临时变量

DECLARE @level INT,

@levelcount INT

SET @levelcount = 0

--定义游标，表名及列名根据实际进行修改

DECLARE cus_count CURSOR FOR

SELECT level FROM dbo.grouptemp

--打开游标

OPEN cus_count

--定位到下一行。打开后未定位游标定位到首行

FETCH NEXT FROM cus_count INTO @level

--循环游标，条件为小于某个数值并且游标循环未结束。@@FETCH_STATUS = 0表示游标未循环结束。

WHILE (@levelcount < 100) AND (@@FETCH_STATUS = 0)

BEGIN

SET @levelcount = @levelcount+@level

FETCH NEXT FROM cus_count INTO @level

END

--关闭游标

CLOSE cus_count

--释放游标

DEALLOCATE cus_count

--数值打印出来以便调试，正式方法中可不打印

PRINT @levelcount