sql - 为什么这个 T-SQL 会重复结果

Question

为什么这个 T-SQL 会重复结果？

这个查询相当通用，因此应该可以在任何数据库中复制。

我在 TextLine 列中看到重复的 USP...

SELECT DISTINCT b.name as TableName,  
        STUFF((
             SELECT ', ' + OBJECT_NAME(a.object_id)
             FROM sys.sql_dependencies a 
             WHERE a.referenced_major_id = b.object_id
             ORDER BY 1
             For XML PATH ('')
            ), 1, 1, '') AS [TextLine]
FROM sys.sql_dependencies a JOIN sys.tables b ON a.referenced_major_id = b.object_id
ORDER BY 1 ASC

Answer 1

将DISTINCT添加到子查询

SELECT DISTINCT b.name                               AS TableName,
                Stuff((SELECT DISTINCT ', ' + Object_name(a.object_id) --Here
                       FROM   sys.sql_dependencies a
                       WHERE  a.referenced_major_id = b.object_id
                       ORDER  BY 1
                       FOR XML PATH ('')), 1, 1, '') AS [TextLine]
FROM   sys.sql_dependencies a
       JOIN sys.tables b
         ON a.referenced_major_id = b.object_id
ORDER  BY TableName ASC 

现在，对于每个表，只有不同依赖的对象将被连接