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SQL SERVER - does not exist in - Help with sql  insert

Posted on 2014-02-17
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Last Modified: 2014-02-17
Hi..
I have 2 identical tables   A and B. both with an ID

I want to insert the records from B into A that are not in A.

what is the correct SQL syntax

thx
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Question by:JElster
3 Comments
 
LVL 16

Assisted Solution

by:Surendra Nath
Surendra Nath earned 200 total points
ID: 39865270
try this out

INSERT INTO A
SELECT * FROM B 
WHERE NOT EXISTS ( SELECT 1 FROM A WHERE A.id = B.id)

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by:
Jim Horn earned 200 total points
ID: 39865278
Just to be safe...

INSERT INTO A (id, column1, column2, ..., columnN)
SELECT id, column1, column2, ..., columnN
FROM B
   LEFT JOIN A ON B.id = a.id
WHERE a.id IS NULL

The above FROM .. WHERE NOT EXISTS will also work, although I would recommend

WHERE NOT EXISTS ( SELECT id FROM A WHERE A.id = B.id)
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LVL 10

Assisted Solution

by:PadawanDBA
PadawanDBA earned 100 total points
ID: 39865281
assuming the IDs are aligned the following should work...

insert into A
  select
      *
  from
      B as B
           left join A as A on B.ID = A.ID
  where
      A.ID is null;

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Edit:
As an addendum, if the ID is an identity, you will have to turn identity insert on and may have to reseed the identity column
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