Select a value from table for each database [duplicate] - sql

Question

I have (for testing purposes) many dbs with the same schema (=same tables and columns basically) on a sql server 2008 r2 instance.
i would like a query like
SELECT COUNT(*) FROM CUSTOMERS
on all DBs on the instance. I would like to have as result 2 columns:
1 - the DB Name
2 - the value of COUNT(*)
Example:
DBName // COUNT (*)
TestDB1 // 4
MyDB // 5
etc...
Note: i assume that CUSTOMERS table exists in all dbs (except master).

Answer 1

Try this one -
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 ' + QUOTENAME(name, '''') + ', COUNT(1) FROM ' + QUOTENAME(name) + '.' + QUOTENAME(#TableName)
FROM sys.databases
WHERE OBJECT_ID(QUOTENAME(name) + '.' + QUOTENAME(#TableName)) IS NOT NULL
FOR XML PATH(''), TYPE).value('text()[1]', 'NVARCHAR(MAX)'), 1, 1, '')
INSERT INTO #temp (DB, [COUNT])
EXEC sys.sp_executesql #SQL
SELECT *
FROM #temp t
Output (for example, in AdventureWorks) -
COUNT DB
----------- --------------------------------------------------
19972 AdventureWorks2008R2
19975 AdventureWorks2012
19472 AdventureWorks2008R2_Live

Answer 2

Straight forward query
EXECUTE sp_MSForEachDB
'USE ?; SELECT DB_NAME()AS DBName,
COUNT(1)AS [Count] FROM CUSTOMERS'
This query will show you what you want to see, but will also throw errors for each DB without a table called "CUSTOMERS". You will need to work out a logic to handle that.
Raj

Answer 3

How about something like this:
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

Answer 4

declare #userdb_list table (name varchar(4000) not null);
-- fill the db list with custom subset
insert into #userdb_list
select name from sys.databases --can add where condition to filter db names
declare
#curr_userdb varchar(300),
#db_placeholder varchar(300),
#final_db_exec_query varchar(max),
#query varchar(max);
set #query = '' -- <add ur query here>
set #db_placeholder = 'use {db}';
set #curr_userdb = (select min(name) from #userdb_list);
while #curr_userdb is not null
begin
set #final_db_exec_query = replace(#db_placeholder, '{db}', #curr_userdb + ' ' + #query);
exec (#final_db_exec_query);
--print #final_db_exec_query
set #curr_userdb = (select min(name) from #userdb_list where name > #curr_userdb);
end
GO
Solution without cursor - clean and simple

Answer 5

Because I know that a question was just referred to here that asked a slightly different question... if you only want to execute on certain databases, those databases could be stored in some table. Here I stored in a temporary table.
CREATE TABLE #Databases (
DbName varchar(255))
INSERT INTO #Databases (DbName)
Values ('GIS_NewJersey'), ('GIS_Pennsylvania')
DECLARE #command varchar(1000)
SELECT #command = 'Use [' + DbName + '];
Update sde.SAP_Load
SET FullAddress = CONCAT_WS('','', HouseNumber, Street, City, Postal, RegionName)
Update sde.PREMISE
SET FullAddress = CONCAT_WS('', '', HouseNumber, Street, City, Postal, RegionName)
Update sde.PREMISE_GEOCODE
SET FullAddress = CONCAT_WS('', '', HouseNumber, Street, City, Postal, RegionName)'
FROM #Databases
EXEC #command