Question

Msg 137, Level 16, State 1.
Must declare the scalar variable "@tempNums".
Msg 137, Level 16, State 1.
Must declare the scalar variable "@tempNames". (Line 25)

导致以下错误消息：

{{1}}

如何从WITH子句中访问临时表？

随机文字制作愚蠢的＃34;主要代码＆＃34;警告开始。

Answer 1

这些不是临时表，它们是表变量，必须稍微区别对待。您需要在查询中使用别名，而不是尝试再次使用表变量的名称。无论如何，你真的应该养成使用别名的习惯。

DECLARE @tempNums TABLE(
    id INT PRIMARY KEY IDENTITY(1,1),
    val INT
);

DECLARE @tempNames TABLE(
    id INT PRIMARY KEY IDENTITY(1,1),
    name VARCHAR(10)
);

DECLARE @combined TABLE(
    val INT,
    name VARCHAR(10)
);

INSERT INTO @tempNums(val) VALUES (1),(2),(3);
INSERT INTO @tempNames(name) VALUES ('one'),('two'),('three');

WITH cte AS (
    SELECT 
        tNum.val AS 'val',
        tName.name AS 'name'
    FROM @tempNums tNum
        INNER JOIN @tempNames tName
            ON tNum.val = tName.id
)
MERGE INTO @combined
    USING cte ON 1 = 0
WHEN NOT MATCHED THEN
    INSERT (val,name)
    VALUES(cte.val, cte.name);

SELECT * from @combined;

从WITH子句内部访问临时表

1 个答案: