用于INFORMATION_SCHEMA的SQL Server中的等效查询

Question

我正在开发一个页面,我们需要在两个数据库中可视地比较同一个表的模式 - 一个在sql server中,另一个在mysql中.我也必须包含索引.

现在mysql查询显示信息和索引 -

select column_name,column_type,table_name,column_key 
  from INFORMATION_SCHEMA.COLUMNS where table_name = 'tbl_ClientDN'

但对于sql server,相同的查询不会返回索引 -

 select * from INFORMATION_SCHEMA.COLUMNS where table_name = 'tbl_ClientDN'

所以我需要查询来计算结果 -

 sp_helpindex 'tbl_ClientDN'

如何让column_key在mssql查询中显示索引.有什么建议吗？

Answer 1

远离INFORMATION_SCHEMA.COLUMNS,尤其是索引,因为过滤索引和包含列之类的东西不是定义的一部分.我在这里更详细地讨论这个问题:

针对INFORMATION_SCHEMA视图的案例

你想使用sys.indexes和sys.index_columns为此.例如:

DECLARE @tablename NVARCHAR(512) = 'dbo.tbl_ClientDN';

SELECT
    [Index]  = i.name,
    [Column] = c.Name, 
    [Type]   = i.type_desc,
    PK = i.is_primary_key,
    [Unique] = i.is_unique,
    [Unique Constraint] = i.is_unique_constraint,
    [DESC] = ic.is_descending_key,
    [INCLUDE] = ic.is_included_column,
    [Filtered] = i.filter_definition -- only for SQL Server 2008+
FROM
    sys.indexes AS i 
INNER JOIN 
    sys.index_columns AS ic 
    ON i.[object_id] = ic.[object_id] 
    AND i.index_id = ic.index_id
INNER JOIN 
    sys.columns c
    ON ic.column_id = c.column_id
    AND ic.[object_id] = c.[object_id]
WHERE 
    i.[object_id] = OBJECT_ID(@tablename)
ORDER BY [Index], ic.index_column_id;

如果要一次对所有表执行此操作,那么只需进行简单的更改:

SELECT
    [Table] = QUOTENAME(OBJECT_SCHEMA_NAME(i.[object_id]))
      + '.' + QUOTENAME(OBJECT_NAME(i.[object_id])),
    [Index]  = i.name,
    [Column] = c.Name, 
    [Type]   = i.type_desc,
    PK = i.is_primary_key,
    [Unique] = i.is_unique,
    [Unique Constraint] = i.is_unique_constraint,
    [DESC] = ic.is_descending_key,
    [INCLUDE] = ic.is_included_column,
    [Filtered] = i.filter_definition -- only for SQL Server 2008+
FROM
    sys.indexes AS i 
INNER JOIN 
    sys.index_columns AS ic 
    ON i.[object_id] = ic.[object_id] 
    AND i.index_id = ic.index_id
INNER JOIN 
    sys.columns c
    ON ic.column_id = c.column_id
    AND ic.[object_id] = c.[object_id]
ORDER BY [Table], [Index], ic.index_column_id;

您没有指定您正在使用的SQL Server版本,因此以下是有关sys.indexes和的主题的所有链接sys.index_columns:

SYS.INDEXES

SQL Server 2005 http://technet.microsoft.com/en-us/library/ms173760%28SQL.90%29.aspx
SQL Server 2008 http://technet.microsoft.com/en-us/library/ms173760%28SQL .100%29.aspx
SQL Server 2008 R2 http://technet.microsoft.com/en-us/library/ms173760%28SQL.105%29.aspx
SQL Server 2012 http://technet.microsoft.com/en-我们/库/ ms173760%28SQL.110%29.aspx

sys.index_columns

SQL Server 2005 http://technet.microsoft.com/en-us/library/ms175105%28SQL.90%29.aspx
SQL Server 2008 http://technet.microsoft.com/en-us/library/ms175105%28SQL .100%29.aspx
SQL Server 2008 R2 http://technet.microsoft.com/en-us/library/ms175105%28SQL.105%29.aspx
SQL Server 2012 http://technet.microsoft.com/en-我们/库/ ms175105%28SQL.110%29.aspx

您还可以查看一下Kimberley L. Tripp的sp_helpindex2.

编辑

总的来说,我同意@ BrianWhite的评论.如果您正在为此付出任何努力,那么您应该使用一个工具来代替重新发明轮子并尝试自己编写.对这个问题进行疑难解答,就时间而言,您可能已经花费了一个好工具的成本.请阅读这篇文章:

http://bertrandaaron.wordpress.com/2012/04/20/re-blog-the-cost-of-reinventing-the-wheel/