SQL Server Linked Server Example Query

Question

While in Management Studio  I am trying to run a query do a join between two linked servers  Is this a correct syntax using linked db servers   select foo id  from databaseserver1 db1 table1 foo        databaseserver2 db1 table1 bar  where foo name bar name   Basically  do you just preface the db server name to the db table

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select name from drsql01 test dbo employee    drslq01 is servernmae --linked serer test is database name dbo is schema    -default schema employee is table name   I hope it helps to understand  how to execute query for linked server

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If you still find issue with  lt server gt   lt database gt   lt schema gt   lt table gt   Enclose server name in

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The format should probably be    lt server gt   lt database gt   lt schema gt   lt table gt    For example  DatabaseServer1 db1 dbo table1    Update  I know this is an old question and the answer I have is correct  however  I think any one else stumbling upon this should know a few things   Namely  when querying against a linked server in a join situation the ENTIRE table from the linked server will likely be downloaded to the server the query is executing from in order to do the join operation   In the OP s case  both table1 from DB1 and table1 from DB2 will be transferred in their entirety to the server executing the query  presumably named DB3     If you have large tables  this may result in an operation that takes a long time to execute   After all it is now constrained by network traffic speeds which is orders of magnitude slower than memory or even disk transfer speeds   If possible  perform a single query against the remote server  without joining to a local table  to pull the data you need into a temp table   Then query off of that     If that s not possible then you need to look at the various things that would cause SQL server to have to load the entire table locally   For example using GETDATE   or even certain joins   Others performance killers include not giving appropriate rights   See http   thomaslarock com 2013 05 top-3-performance-killers-for-linked-server-queries  for some more info

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For what it s worth  I found the following syntax to work the best   SELECT   FROM  LINKED SERVER     TABLE   I couldn t get the recommendations of others to work  using the database name  Additionally  this data source has no schema

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SELECT   FROM OPENQUERY  SERVER NAME    SELECT   FROM DATABASE NAME  TABLENAME     This may help you

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Following Query is work best      Try this Query    SELECT   FROM OPENQUERY  LINKED SERVER NAME    SELECT   FROM  DATABASE NAME   SCHEMA   TABLE NAME         It Very helps to link MySQL to MS SQL

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right click on a table and click script table as select

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select   from  Server   database   schema   tablename     This is the correct way to call   Be sure to verify that the servers are linked before executing the query   To check for linked servers call   EXEC sys sp linkedservers

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I have done to find out the data type in the table at link server using openquery and the results were successful  SELECT   FROM OPENQUERY  LINKSERVERNAME    SELECT DATA TYPE  COLUMN NAME FROM  DATABASENAME  INFORMATION SCHEMA COLUMNS WHERE       TABLE NAME     TABLENAME       Its work for me

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You need to specify the schema owner  dbo by default  as part of the reference  Also  it would be preferable to use the newer  ANSI-92  join style   select foo id      from databaseserver1 db1 dbo table1 foo         inner join databaseserver2 db1 dbo table1 bar              on foo name   bar name

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For those having trouble with these other answers   try OPENQUERY  Example    SELECT   FROM OPENQUERY  LinkedServer    select   from  DBName   schema   tablename

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Usually direct queries should not be used in case of linked server because it heavily use temp database of SQL server  At first step data is retrieved into temp DB then filtering occur  There are many threads about this  It is better to use open OPENQUERY because it passes SQL to the source linked server and then it return filtered results e g   SELECT   FROM OPENQUERY Linked Server Name    select   from TableName where ID   500

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PostgreSQL    You  must provide a database name in the Data Source DSN  Run Management Studio as Administrator You must omit the DBName from the query   SELECT   FROM OPENQUERY  LinkedServer    select   from schema  tablename

[sql-server] SQL Server Linked Server Example Query

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