Question

我使用以下脚本来获取所有数据库的行数这些数据库的结构完全相同。

USE [MyTestDb1];

SELECT 
    'MyTestDb1'as [Database Name], so.name AS [Table Name],   
    rows AS [RowCount]   
FROM 
    sysindexes AS si   
JOIN 
    sysobjects AS so on si.id = so.id   
WHERE 
    indid IN (0,1)   
    AND xtype = 'U'

USE [MyTestDb2];

SELECT 
   'MyTestDb2'as [Database Name], so.name AS [Table Name],   
    rows AS [RowCount]   
FROM 
    sysindexes AS si   
JOIN 
    sysobjects AS so on si.id = so.id   
WHERE 
    indid IN (0,1)  
    AND xtype = 'U'

在c＃的运行时，根据我要比较的dbs数量来构建sql脚本，然后执行。

鉴于我想在同一台服务器上比较多个dbs的行我似乎无法实现以下输出。我相信是我需要的支点但似乎无法解决这个问题。

TableName   Db1     Db2   Db3    Db4
------------------------------------
Table1      10      10    10     10
Table2      13      13    13     13
Table3      10      10    10     10
Table4      10      10    10     10
Table5      10      10    10     10

有关如何以上述格式退货的任何建议/帮助吗？

非常感谢。

Answer 1

是。此时您需要PIVOT。

首先声明一个变量来动态获取列名

DECLARE @cols NVARCHAR (MAX)

SELECT @cols = COALESCE (@cols + ',[' + [Database Name] + ']', '[' + [Database Name] + ']')
               FROM    
               (
                    SELECT DISTINCT 'MyTestDb1'as [Database Name]   
                    FROM sysindexes AS si   
                        join sysobjects AS so on si.id = so.id   
                    WHERE indid IN (0,1)   
                    AND xtype = 'U'
                ) PV 
               ORDER BY [Database Name]

现在将结果作为数据库名称在行中的列和表名中进行。

DECLARE @query NVARCHAR(MAX)
SET @query = '-- This outer query forms your pivoted result
             SELECT * FROM 
             (
                SELECT ''MyTestDb1'' as [Database Name], so.name AS [Table Name],   
                rows AS [RowCount]   
                FROM sysindexes AS si   
                    join sysobjects AS so on si.id = so.id   
                WHERE indid IN (0,1)   
                AND xtype = ''U''
             ) x
             PIVOT 
             (
                 --Defines the values in each dynamic columns
                 MIN([RowCount])
                 -- Get the names from the @cols variable to show as column
                 FOR [Database Name] IN (' + @cols + ')
            ) p            
            ORDER BY [Table Name];' 

EXEC SP_EXECUTESQL @query

编辑：

我已将数据插入临时表以便于理解。 CTE1将csv转换为行，CTE2从sys....获取数据。在最后一部分中，我们使用CROSS JOIN，因为根据您的要求，不需要INNER JOIN。

DECLARE @PARAM VARCHAR(MAX)='DB1 | DB2 | DB3'

;WITH CTE1 AS
(
    SELECT LTRIM(RTRIM(Split.a.value('.', 'VARCHAR(100)'))) 'Database Name' 
    FROM  
    (         
         SELECT CAST ('<M>' + REPLACE(@PARAM, '|', '</M><M>') + '</M>' AS XML) AS Data              
    ) AS A 
    CROSS APPLY Data.nodes ('/M') AS Split(a)
)
,CTE2 AS
(
    SELECT so.name AS [Table Name],   
        rows AS [RowCount]   
    FROM sysindexes AS si   
        join sysobjects AS so on si.id = so.id   
    WHERE indid IN (0,1)   
    AND xtype = 'U'
)
SELECT [Database Name],[Table Name],[RowCount]
INTO #NEWTABLE
FROM CTE1 
CROSS JOIN CTE2

现在声明变量以获取pivot

的列

DECLARE @cols NVARCHAR (MAX)

SELECT @cols = STUFF((SELECT distinct ',' + QUOTENAME(DatabaseName) 
            FROM 
            (
                SELECT LTRIM(RTRIM(Split.a.value('.', 'VARCHAR(100)'))) 'DatabaseName' 
                FROM  
                (         
                     SELECT CAST ('<M>' + REPLACE(@PARAM, '|', '</M><M>') + '</M>' AS XML) AS Data              
                ) AS A 
                CROSS APPLY Data.nodes ('/M') AS Split(a)
            ) c
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

现在转动查询

DECLARE @query NVARCHAR(MAX)
SET @query = '
SELECT * 
FROM
(
    SELECT [Database Name],[Table Name],[RowCount]
    FROM #NEWTABLE  
)TAB
PIVOT 
(
     MIN([RowCount])
     for [Database Name] in (' + @cols + ')
) as P' 

EXEC SP_EXECUTESQL @query

获取跨dbs和pivot sql server 2012的所有表的行数

1 个答案: