Question

我在同一个DB的几个表上执行此查询，所有表都以相同的方式构建。基本上，查询找到Table_xxx中列出的代码，这些代码不在表“组件”中。

SELECT DISTINCT a.Code, a.Description,  a.Quantity FROM Table_321 AS a
                        WHERE NOT EXISTS (SELECT * FROM Components where Components.Code = a.Code)
                        UNION ALL
SELECT DISTINCT a.Code, a.Description, a.Quantity FROM Table_333 AS a
                        WHERE NOT EXISTS (SELECT * FROM Components where Components.Code = a.Code)
                        UNION ALL
                        .............
                        .............
                        order by Code

如何获取最初包含“代码，描述和数量”的表名？

Answer 1

您可以在每个选择查询中添加额外的列tableName

SELECT DISTINCT a.Code, a.Description,  a.Quantity, 'Table_321' as tableName FROM Table_321 AS a
                        WHERE NOT EXISTS (SELECT * FROM Components where Components.Code = a.Code)
                        UNION ALL
SELECT DISTINCT a.Code, a.Description, a.Quantity, 'Table_333' as tableName FROM Table_333 AS a
                        WHERE NOT EXISTS (SELECT * FROM Components where Components.Code = a.Code)
                        UNION ALL
                        .............
                        .............
                        order by Code

Answer 2

以下列格式提出您的查询：

SELECT DISTINCT a.Code, a.Description,  a.Quantity,'Table_321' AS tblName FROM Table_321 AS a 
WHERE a.Code NOT IN (SELECT Components.Code FROM Components)

SQL查询以从发起数据的位置获取表名

2 个答案: