如何在实例上的所有数据库上运行相同的查询？

Question

我(在测试目的上)在sql server 2008 r2实例上有许多具有相同模式(基本上相同的表和列)的dbs.

我想要一个查询

SELECT COUNT(*) FROM CUSTOMERS

在实例上的所有DB上.我希望得到2列:

1 - 数据库名称

2 - 的价值 COUNT(*)

例:

DBName  //   COUNT (*)

TestDB1 // 4

MyDB  // 5

etc...

注意:我假设该CUSTOMERS表存在于所有dbs中(除外master).

Answer 1

试试这个 -

SET NOCOUNT ON;

IF OBJECT_ID (N'tempdb.dbo.#temp') IS NOT NULL
   DROP TABLE #temp

CREATE TABLE #temp
(
      [COUNT] INT
    , DB VARCHAR(50)
)

DECLARE @TableName NVARCHAR(50) 
SELECT @TableName = '[dbo].[CUSTOMERS]'

DECLARE @SQL NVARCHAR(MAX)
SELECT @SQL = STUFF((
    SELECT CHAR(13) + 'SELECT ''' + name + ''', COUNT(1) FROM [' + name + '].' + @TableName
    FROM sys.databases 
    WHERE OBJECT_ID('[' + name + ']' + '.' + @TableName) IS NOT NULL
    FOR XML PATH(''), TYPE).value('.', 'NVARCHAR(MAX)'), 1, 1, '')

INSERT INTO #temp (DB, [COUNT])              
EXEC sys.sp_executesql @SQL

SELECT * 
FROM #temp t

输出(例如,输入AdventureWorks) -

COUNT       DB
----------- --------------------------------------------------
19972       AdventureWorks2008R2
19975       AdventureWorks2012
19472       AdventureWorks2008R2_Live

Answer 2

直接查询

EXECUTE sp_MSForEachDB 
        'USE ?; SELECT DB_NAME()AS DBName, 
        COUNT(1)AS [Count] FROM CUSTOMERS'

此查询将显示您想要查看的内容,但也会在没有名为"CUSTOMERS"的表的情况下为每个数据库抛出错误.你需要设计一个逻辑来处理它.

拉吉

Answer 3

这样的事情怎么样:

DECLARE c_db_names CURSOR FOR
SELECT name 
FROM sys.databases
WHERE name NOT IN('master', 'tempdb') --might need to exclude more dbs

OPEN c_db_names

FETCH c_db_names INTO @db_name

WHILE @@Fetch_Status = 0
BEGIN
  EXEC('
    INSERT INTO #report
    SELECT 
      ''' + @db_name + '''
      ,COUNT(*)
    FROM ' + @db_name + '..linkfile
  ')
  FETCH c_db_names INTO @db_name
END

CLOSE c_db_names
DEALLOCATE c_db_names

SELECT * FROM #report