为啥我不能从我的查询中选择？

Posted 2023-02-16

【中文标题】为啥我不能从我的查询中选择？

【英文标题】：Why can't I select from my query?为什么我不能从我的查询中选择？

【发布时间】：2011-05-12 01:56:41

【问题描述】：

我有一个类似这样的查询（不，我的表和字段不是由这些名称调用的，但结构是相同的）-

SELECT table1.id, table2.id, table1.phone1
FROM table1 LEFT OUTER JOIN
    table3 ON table3.id = table1.id LEFT OUTER JOIN
    table2 ON table3.id2 = table2.id    
    WHERE table1.phone1 IS NOT NULL AND LTRIM(RTRIM(table1.phone1)) <> ''

UNION

SELECT table1.id, table2.id, table1.phone2
FROM table1  LEFT OUTER JOIN
    table3 ON table3.id = table1.id LEFT OUTER JOIN
    table2 ON table3.id2 = table2.id    
WHERE table1.phone2 IS NOT NULL AND LTRIM(RTRIM(table1.phone2)) <> ''

UNION

SELECT table1.id, table2.id, table2.phone
FROM table1 LEFT OUTER JOIN
    table3 ON table3.id = table1.id LEFT OUTER JOIN
    table2 ON table3.id2 = table2.id    
WHERE table2.phone IS NOT NULL AND LTRIM(RTRIM(table2.phone)) <> ''

运行良好。但是，当我尝试从中选择时（我最终会尝试使用 group bys 等进行操作，但现在只是尝试了一个简单的选择），如下所示：

SELECT * FROM
    ( SELECT table1.id, table2.id, table1.phone1
    FROM table1 LEFT OUTER JOIN
        table3 ON table3.id = table1.id LEFT OUTER JOIN
        table2 ON table3.id2 = table2.id    
        WHERE table1.phone1 IS NOT NULL AND LTRIM(RTRIM(table1.phone1)) <> ''

    UNION

    SELECT table1.id, table2.id, table1.phone2
    FROM table1  LEFT OUTER JOIN
        table3 ON table3.id = table1.id LEFT OUTER JOIN
        table2 ON table3.id2 = table2.id    
    WHERE table1.phone2 IS NOT NULL AND LTRIM(RTRIM(table1.phone2)) <> ''

    UNION

    SELECT table1.id, table2.id, table2.phone
    FROM table1 LEFT OUTER JOIN
        table3 ON table3.id = table1.id LEFT OUTER JOIN
        table2 ON table3.id2 = table2.id    
    WHERE table2.phone IS NOT NULL AND LTRIM(RTRIM(table2.phone)) <> '' )

我得到错误：

Incorrect syntax near ')'.

我做错了什么？

【参考方案1】：

您错过了子选择的命名。以...) sub_query_name 之类的方式结束。

【讨论】：

+1：我知道现在是早上，我看的时候没有想到。

非常感谢！我知道这是我忘记的东西……现在可以了:)