Question

通过此查询，我获得了所有数据库CHECK，FOREIGN_KEY，PRIMARY_KEY和UNIQUE_KEY约束的列表。

SELECT 
    o.object_id as ID, o.name AS Name, 
    OBJECT_NAME(o.parent_object_id) AS TableName, 
    o.type_desc AS TypeName, 
    cs.COLUMN_NAME as ColumnName
FROM 
    sys.objects o 
LEFT JOIN 
    INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE cs ON o.name = cs.CONSTRAINT_NAME 
WHERE 
    o.type = 'C' or o.type = 'F' or o.type = 'PK' or o.type = 'UQ'

然而，其中有一些有很多'ColumnName'，我想结束这个。

例如：

  'PK_ENTITE_SIGN_DOSSIER_ID_DOSSIER_ID_ENTITE_ID_GROUPE_SIGN_ID_PERSONNE_ID_SCHEMA'

是表PRIMARY_KEY上的ENTITE_SIGN_DOSSIER，其中包含ID_DOSSIER，ID_ENTITE，ID_GROUPE_SIGN，ID_PERSONNE和ID_SCHEMA（5）在这种情况下，我的查询为此约束返回5行。

如何在查询结果上连接这些列名？

非常感谢你的帮助

Answer 1

这是标准xml和stuff功能技巧：

SELECT  o.object_id AS ID ,
        o.name AS Name ,
        OBJECT_NAME(o.parent_object_id) AS TableName ,
        o.type_desc AS TypeName ,
        ca.ColumnName
FROM    sys.objects o
        CROSS APPLY ( SELECT    STUFF(( SELECT  ', ' + cs.COLUMN_NAME
                                        FROM    INFORMATION_SCHEMA.CONSTRAINT_COLUMN_USAGE cs
                                        WHERE   o.name = cs.CONSTRAINT_NAME
                                      FOR
                                        XML PATH('')
                                      ), 1, 2, '') AS ColumnName
                    ) ca
WHERE   o.type = 'C'
        OR o.type = 'F'
        OR o.type = 'PK'
        OR o.type = 'UQ'
ORDER BY ID

获取SQL Server的约束列表，没有冗余

1 个答案: