将多行默认值插入表中 [英] Insert multiple rows of default values into a table

问题描述

我有一个单列的表，这是一个自动生成的身份

I have a table with a single column, which is an auto-generated identity

create table SingleIdTable (
   id int identity(1,1) not null
)

我可以插入带有自动生成的 ID 的单行:

I can insert a single row with an auto-generated id with:

insert into SingleIdTable default values

我想插入多行并使用输出语法来获取它们的 id，例如:

I want to insert many rows and use the output syntax to get their ids, something like:

insert into SingleIdTable
output inserted.Id into @TableOfIds
    select (default values) from SomeOtherTable where Attribute is null

其目的是为 SomeOtherTable 中的每一行在 SingleIdTable 中插入一行，其中 Attribute 使用自动生成的 ID 为空.以上不起作用，但我怎么做.我注意到，如果我的表格不止一列，我可以做到，但我不能选择空行，而这正是我真正想要做的.

Where the intention is to insert a row into SingleIdTable for each row in SomeOtherTable where Attribute is null using an auto-generated id. The above doesn't work, but how could I do it. I note that if my table had more than just a single column I could do it, but I can't select empty rows which is what I really want to do.

我无法更改SomeOtherTable 的定义.

推荐答案

如果 SQL Server 2008+ 你可以使用 MERGE 来解决这个问题.下面的示例语法.

If SQL Server 2008+ you can use MERGE for this. Example syntax below.

MERGE INTO SingleIdTable
USING (SELECT *
       FROM   SomeOtherTable
       WHERE  Attribute IS NULL) T
ON 1 = 0
WHEN NOT MATCHED THEN
  INSERT
  DEFAULT VALUES
OUTPUT INSERTED.id; 

我不确定这个单列表有什么实际用途?

I'm not sure what practical use this single column table has though?

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