Sql server 添加引用标识列的列

在我的表

table1

中，我添加了一列

taxonomy\u id

引用

taxonomy\u id

列，该列是一个标识列。 现在，我需要插入尽可能多的

taxonomy

记录，就像表

table1

中的记录一样，并且我需要更新

table1.taxonomy\u id

以引用

taxonomy.taxonomy\u id

如何在SQL server中实现这一点？我可以运行一个游标，逐个插入行，然后使用

scope\u identity（）

，但这是唯一的解决方案吗

示例数据集和结构：

--drop table taxonomy
create table taxonomy(taxonomy_id int identity, data varchar(50))

--drop table table1
create table table1(table1_id int, taxonomy_id int)

insert into table1 (table1_id) values (999), (777), (555), (22), (54423)

我没有按照你的插入细节，但上面是获得iden的机制

?

---

这就是我所做的：

-- declare a temp table
declare @temptab table(taxonomy_id int);

-- insert new rows into taxonomy table
-- return the IDs so we know which ones are the new ones
insert into taxonomy(data)
output inserted.taxonomy_id into @temptab
select 'table1 taxonomy data' from table1

-- update table1 with the IDs from the temp table
update table1
set taxonomy_id = t2.taxonomy_id
from (
    -- using the row_number makes little sense but..
    -- I needed a way to pair @temptab and table1 rows
    select table1_id, ROW_NUMBER() over (order by table1_id) from table1 
) t1(table1_id, rownum)
inner join (
    select taxonomy_id, ROW_NUMBER() over (order by taxonomy_id) from @temptab
) t2(taxonomy_id, rownum)
on t1.rownum = t2.rownum
where table1.table1_id = t1.table1_id

---

现在，每个

table1

记录都连接到

taxonomy

表中的一个记录。

请参阅输出，欢迎使用。恐怕这个问题没有给我太多的帮助。

insert into taxonomy (col1, col2)  
select col1, col2 from table1 
output inserted.id, inserted.col1, inserted.col2
update table1
   set table1.taxonomy_id  = inserted.id
  from table1 
  join inserted 
        on inserted.col1 = table1.col1 
       and inserted.col2 = table1.col2

-- declare a temp table
declare @temptab table(taxonomy_id int);

-- insert new rows into taxonomy table
-- return the IDs so we know which ones are the new ones
insert into taxonomy(data)
output inserted.taxonomy_id into @temptab
select 'table1 taxonomy data' from table1

-- update table1 with the IDs from the temp table
update table1
set taxonomy_id = t2.taxonomy_id
from (
    -- using the row_number makes little sense but..
    -- I needed a way to pair @temptab and table1 rows
    select table1_id, ROW_NUMBER() over (order by table1_id) from table1 
) t1(table1_id, rownum)
inner join (
    select taxonomy_id, ROW_NUMBER() over (order by taxonomy_id) from @temptab
) t2(taxonomy_id, rownum)
on t1.rownum = t2.rownum
where table1.table1_id = t1.table1_id