Question

我有一张像

这样的表

select SupplierID,ProductIDs from T_ProductSupplierTable

输出

SupplierID  ProductIDs
1             1,2,3
2             2,3,4
3             1,5,2

我需要像

这样的答案

SupplierID  ProductIDs
1           1
1           2
1           3
2           2
2           3
2           4
3           1
3           5
3           2

如何生成查询......？

Answer 1

您可以使用一些准备在Internet上使用的功能来拆分字符串并转换为表格，以后您可以加入SubpplierID。

不使用功能的另一个选项是Sample in SQL Fiddle

SELECT supplierid,
LTRIM(RTRIM(m.n.value('.[1]','varchar(8000)'))) AS ProductIDs 
FROM
(
SELECT supplierid,CAST('<XMLRoot><RowData>' + REPLACE(ProductIDs ,',','</RowData><RowData>') + '</RowData></XMLRoot>' AS XML) AS x
FROM   tab
)t
CROSS APPLY x.nodes('/XMLRoot/RowData')m(n)

Answer 2

此外，你可以使用递归cte。 Sample

with cte as (
  select SupplierID, ProductIDs as IDs, cast(null as varchar(8000)) as Product, charindex(',',ProductIDs) as nxt
  from tab
  union all
  select SupplierID, substring(IDs,nxt+1,8000), left(IDs,nxt-1), charindex(',',IDs,nxt+1)-nxt
  from cte where nxt > 0
  union all
  select SupplierID, null, IDs, null
  from cte where nxt <= 0
)
select supplierid, Product from cte where Product is not null

在SQL中拆分逗号

2 个答案: