Question

我正在开发一个页面，我们需要在两个数据库之间直观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查询显示信息以及索引 -

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

但是对于sql server，同一个查询不会返回索引 -

 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，特别是索引，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：

The case against INFORMATION_SCHEMA views

您想使用sys.indexes和sys.index_columns。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;

如果您想一次为所有表执行此操作，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;

您没有指定所使用的SQL Server版本，因此以下是指向sys.indexes和sys.index_columns主题的所有链接：

<强> 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-us/library/ms173760%28SQL.110%29.aspx

<强> 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-us/library/ms175105%28SQL.110%29.aspx

您也可以查看一下Kimberley L. Tripp的sp_helpindex2。

修改

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/

Answer 2

也许你在sp_help

之后

http://msdn.microsoft.com/en-us/library/ms187335.aspx

只需输入

sp_help myTableName

应该为您提供所需的所有数据。

用于INFORMATION_SCHEMA的SQL Server中的等效查询

2 个答案: