获取 dbs 和 pivot sql server 2012 中所有表的行数

Question

我正在使用以下脚本获取所有数据库的行数这些数据库在结构上都是相同的。

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'

在运行从 c# 开始，我构建了 sql 脚本，具体取决于我比较的数据库数量，然后执行。

考虑到我想比较同一台服务器上多个数据库的行我似乎无法实现以下 output.I 相信这是我需要的支点但似乎无法解决。

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

关于如何return以上格式的任何suggestion/help？

非常感谢。

Answer 1

是的。此时您需要PIVOT。

首先声明一个变量动态获取列名

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]

现在将结果转换为列中的数据库名称和行中的 table 名称。

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：

为了便于理解，我已经将数据插入到临时table中。 CTE1 将 csv 转换为行，CTE2 从 sys.... 获取数据。在最后一部分，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数据透视表的列

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,'')

现在转向查询

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 dbs 和 pivot sql server 2012 中所有表的行数

Get row count for all tables across dbs and pivot sql server 2012

sql

sql-server

sql-server-2012

pivot-table