Update Query with INNER JOIN between tables in 2 different databases on 1 server

Question

Need some SQL syntax help :-)

Both databases are on the same server

db1 = DHE
db2 = DHE_Import

UPDATE DHE.dbo.tblAccounts 
INNER JOIN DHE_Import.dbo         


        

Answer 1

You could call it just style, but I prefer aliasing to improve readability.

UPDATE A    
  SET ControllingSalesRep = RA.SalesRepCode   
from DHE.dbo.tblAccounts A
  INNER JOIN DHE_Import.dbo.tblSalesRepsAccountsLink RA
    ON A.AccountCode = RA.AccountCode

For MySQL

UPDATE DHE.dbo.tblAccounts A 
  INNER JOIN DHE_Import.dbo.tblSalesRepsAccountsLink RA 
      ON A.AccountCode = RA.AccountCode 
SET A.ControllingSalesRep = RA.SalesRepCode

Answer 2

Sorry its late, but I guess it would be of help to those who land here finding a solution to similar problem. The set clause should come right after the update clause. So rearranging your query with a bit change does the work.

UPDATE DHE.dbo.tblAccounts 
SET DHE.dbo.tblAccounts.ControllingSalesRep
    = DHE_Import.dbo.tblSalesRepsAccountsLink.SalesRepCode
from DHE.dbo.tblAccounts 
INNER JOIN DHE_Import.dbo.tblSalesRepsAccountsLink 
    ON DHE.dbo.tblAccounts.AccountCode
        = DHE_Import.tblSalesRepsAccountsLink.AccountCode 

Answer 3

Update one table using Inner Join

  UPDATE Table1 SET name=ml.name
FROM table1 t inner JOIN
Table2 ml ON t.ID= ml.ID  

Answer 4

//For Access Database:
UPDATE ((tblEmployee
LEFT JOIN tblCity ON (tblEmployee.CityCode = tblCity.CityCode))
LEFT JOIN tblCountry ON (tblEmployee.CountryCode = tblCountryCode))
SET tblEmployee.CityName = tblCity.CityName, 
tblEmployee.CountryName = tblCountry.CountryName
WHERE (tblEmployee.CityName = '' OR tblEmployee.CountryName = '')

Answer 5

It is explained here http://erabhinavrana.blogspot.in/2014/01/how-to-execute-update-query-by-applying.html

It also has other useful code snippets which are commonly used.

update <dbname of 1st table>.<table name of 1st table> A INNER JOIN <dbname of 2nd table>.<table name of 2nd table> RA ON A.<field name of table 1>=RA.<field name of table 2> SET A.<field name of table 1 to be updated>=RA.<field name of table 2 to set value in table 1>

Replace data in <> with your appropriate values.

That's It. source:

http://www.dynamic-coders.com/how-to-update-two-different-tables-in-different-databases-on-same-server

Answer 6

Worked perfectly for me.

UPDATE TABLE_A a INNER JOIN TABLE_B b ON a.col1 = b.col2 SET a.col_which_you_want_update = b.col_from_which_you_update;