I have two tables:
table1: (ID, Code, Name)
table2: (ID, Code, Name) with same columns
I want to to insert data from table1 to table2 or update columns if that exists in table2 (table1.ID = table2.ID)
What is the simple way to do this?
WITH OUT MERGE
Merge table2 as target
using table1 as source
on
target.id=source.id
When matched
Then
update
set target.id=source.id,
target.name=source.name
When not matched by Target Then
INSERT (id, name) VALUES (id, name);
There are some issues with Merge statement,so it should be used with caution..
Further i recommend ,using merge as two seperate DML statements like below..
insert into table2
select * from table1 t1 where not exists (select 1 from table2 t2 where t2.id=t1.id)
update t2
set
t2.id=t1.id,
t2.name=t1.name
from
table1 t1
join
table2 t2
on t1.id=t2.id
Reasons being stated by Paul White here in his detailed answer..
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