无法绑定多部分标识符 - 子查询 [英] The multi-part identifier could not be bound - SubQuery

问题描述

架构:

create table TableA (A1 int)
create table TableB (B1 int, B2 int)
create table TableC (C1 int)

有问题的查询:

SELECT * 
FROM TableA a
INNER JOIN TableB b ON b.B1=a.A1
INNER JOIN (SELECT TOP 1 * 
            FROM TableC c
            WHERE c.C1=b.B1 ORDER BY c.C1) d ON d.C2=b.B2
INNER JOIN OtherTable ON OtherTable.Foo=d.C1

构建此架构并在 SQL Server 2008 下的 SQLFiddle 中运行查询会导致:

Building this schema and running the query in SQLFiddle under SQL Server 2008 results in:

The multi-part identifier "b.B1" could not be bound.: SELECT * FROM TableA a INNER JOIN TableB b ON b.B1=a.A1 INNER JOIN (SELECT TOP 1 * FROM TableC c WHERE c.C1=b.B1 ORDER BY c.C1) d ON d.C2=b.B2

对子查询使用 CROSS APPLY 而不是 INNER JOIN 可解决问题

有什么问题?

我添加了TOP 1"，它是实际查询的一部分，它是问题的相关部分.

I added "TOP 1" that was part of the real query and it's a relevant part of the problem.

Edit2:有关问题的更多信息.

Further information about the problem.

推荐答案

你不能从 JOIN 子句引用到 JOIN 的另一部分.

you can't reference from JOIN clause to another part of JOIN.

改用这个.

SELECT * 
FROM TableA a
INNER JOIN TableB b
    ON b.B1=a.A1
INNER JOIN TableC c
    ON d.C2=b.B2
      AND c.C1=b.B1

已编辑

SELECT * 
FROM TableA a
INNER JOIN TableB b ON b.B1=a.A1
WHERE b.B2 = (SELECT TOP 1 c.C2 
               FROM TableC c
               WHERE c.C1=b.B1 ORDER BY c.C1)

为了在 JOIN-s 中进一步使用 TableC，你可以使用这个.

For further use of TableC in JOIN-s you can use this.

SELECT * 
FROM TableA a
    INNER JOIN TableB b
        ON b.B1=a.A1
    INNER JOIN
       (
           SELECT
               ROW_NUMBER() OVER (PARTITION BY C1 ORDER BY C2) RN,
               C2
               --, other columns fromTableC if needed
           FROM TableC
       ) CC
     ON b.B2 = CC.C2
       AND CC.RN = 1

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