使用while循环在表中插入多条记录

2021-09-10 00:00:00 sql tsql sql-server

我想在指向其他表中 pk 的表中插入几百行.我一直在尝试使用 while 循环在表中插入多条记录.我实际上是在设置我的测试数据.

I want to insert couple of hundred rows into a table that points to pk in other table. I have been trying to use while loops for inserting multiple records in the table. I am actually setting up my test data.

这就是我正在做的:

declare @count int;
set @count = 4018;

while @count <= 5040 
begin
    INSERT INTO [MY_TABLE]
               ([pk_from_other_table]
               ,[..]
               ,[...]
               ,[..]
               ,[..]
               ,[...]
               ,[...]
               ,[..])
        select
               (pk_from_other_table,
               ,[..]
               ,[...]
               ,[..]
               ,[..]
               ,[...]
               ,[...]
               ,[..])
    @count = @count + 1;
end

但这似乎不起作用！任何人都可以帮忙...我想做的就是插入记录数 = 主表中存在的记录数.

but this does not seems to work ! can anyone help please... all I want to do is insert number of records = number of records that exist in primary table.

?关于如何实现这一目标的任何想法?

? any idea on how can I achieve this ?

我要么在计数附近得到错误的语法

I either get incorrect sytax near count

或

消息 102，级别 15，状态 1，第 17 行',' 附近的语法不正确.

Msg 102, Level 15, State 1, Line 17 Incorrect syntax near ','.

推荐答案

您当前的语法问题是 @count = @count + 1; 需要 set @count =@count + 1.

Your current syntax problem is with the @count = @count + 1; which needs to be set @count = @count + 1.

但是……

不需要循环.你可以直接做一个大的插入，比如:

There is no need for a loop. You can simply do one big insert directly, like:

insert into your_table (fk_col, other_col1, other_col2)
select pk_col, 'something', 'something else' 
from your_other_table

如果需要，可以在上面添加where子句.

If you need to, you can add a where clause to the above.

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