我正在尝试在 SQLServer 中聚合一个STRING"字段.我想在 Oracle 中找到与 LISTAGG 相同的函数.
I'm trying to aggregate a 'STRING' field in SQLServer. I would like to find the same function LISTAGG like in Oracle .
你知道如何做同样的功能或另一种方法吗?
Do you know how to do the same function or an another method?
例如
Field A | Field B
1 | A
1 | B
2 | A
我希望这个查询的结果是
And I would like that the result of this query will be
1 | AB
2 | A
从 SQL Server 2017 STRING_AGG
函数可用,大大简化了逻辑:
Starting in SQL Server 2017 the STRING_AGG
function is available which simplifies the logic considerably:
select FieldA, string_agg(FieldB, '') as data
from yourtable
group by FieldA
参见SQL Fiddle with Demo
在 SQL Server 中,您可以使用 FOR XML PATH
来获取结果:
In SQL Server you can use FOR XML PATH
to get the result:
select distinct t1.FieldA,
STUFF((SELECT distinct '' + t2.FieldB
from yourtable t2
where t1.FieldA = t2.FieldA
FOR XML PATH(''), TYPE
).value('.', 'NVARCHAR(MAX)')
,1,0,'') data
from yourtable t1;
参见SQL Fiddle with Demo
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