sql-server - SQL 上的 String.Join 等效项是什么？

Question

Possible Duplicate:
Is there a way to create a SQL Server function to “join” multiple rows from a subquery into a single delimited field?

大家好!

我正在寻找一种简单的方法来连接“n”个值。像这样的东西:

SELECT MyConcat(',', T.TextColumn)
FROM SomeTable AS T
WHERE T.SomeOtherColumn = SomeCondition

所以如果我有一个像这样的表:

SomeTable:
Id  | TextColumn | SomeOtherColumn
----+------------+----------------
1   | Qwerty     | Y
2   | qwerty     | N
3   | azerty     | N
4   | Azerty     | Y

这会导致类似的结果:

SQL:
SELECT MyConcat(';', T.TextColumn)
FROM SomeTable AS T
WHERE T.SomeOtherColumn = 'Y'

RESULT:
'Qwerty;Azerty'

Answer 1

这应该可以解决问题:

DECLARE @Result VARCHAR(MAX);

SELECT
    @Result = CASE
        WHEN @Result IS NULL
        THEN T.TextColumn
        ELSE @Result + ';' + T.TextColumn
    END
FROM
    SomeTable AS T
WHERE
    T.SomeOtherColumn = 'Y';

SELECT @Result