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Need update TSQL with two tables

Posted on 2016-10-28
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Last Modified: 2016-10-28
Hi

I have two tables, identical structures

CREATE TABLE [dbo].[TempA](
      [RPN] [int] NULL,
      [LanID] [nvarchar](50) NULL
) ON [PRIMARY]

CREATE TABLE [dbo].[TempB](
      [RPN] [int] NOT NULL,
      [LanID] [nvarchar](50) NULL
) ON [PRIMARY]

In TableA  LanID  is blank
In TableB Every LanID has a value


I need an TSQL UPDATE that will update the value of TableA.LanID  from TableB.LanID only when the RPN is equal in both

Thank You
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Question by:charlesbaldo
3 Comments
 
LVL 12

Accepted Solution

by:
Dustin Saunders earned 500 total points
ID: 41864243
Something like this would work:
UPDATE tablea
SET tablea.lanid = tableb.lanid
from tablea
inner join tableb
ON tableb.rpn = tablea.rpn

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0
 
LVL 20

Expert Comment

by:Daniel Van Der Werken
ID: 41864260
Essentially the same as Dustin Saunders said, but with table aliases, which I like a lot.

UPDATE A
SET A.lanid = B.lanid
FROM tablea A
INNER JOIN tableb B
   ON B.rpn = A.rpn

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1
 

Author Closing Comment

by:charlesbaldo
ID: 41864263
That worked, thanks
0

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