Compare data between two tables and update one table data - sql

Question

I have two tables and i need to compare data and update one table records. Please let me know how this can be done, i am trying to not use merge. This is the scenario
Proj1 Table
This is the first table where data needs to be synchronized
ID Text
1 R1
2 R2
3 R3
Proj2 Table
This is the table where data updates are taking place
ID Text Active
3 R1 1
4 R3 1
5 R4 1
After a compare is done on Text field between both these tables result should be similar to below. We are syncing data in Proj2 to similar to Proj1.
ID Text Active
3 R1 1 (Ignore as it exists in both tables)
4 R3 1 (Ignore as it exists in both tables)
5 R4 0 (Update to inactive as it does not exist Proj1 table)
6 R2 1 (Insert as it does not exist in Proj2 table)

Answer 1

If you really can't use MERGE, you can simply split it into an update and an insert query :
INSERT INTO #Proj2(Text, Active)
SELECT Text,1 FROM #Proj1 p1
WHERE NOT EXISTS(
SELECT *
FROM #Proj2 p2
WHERE p2.Text = p1.Text
);
UPDATE
p2
SET
p2.Active = CASE WHEN p1.id is null THEN 0 ELSE 1 END
FROM
#Proj2 p2
LEFT JOIN
#Proj1 p1
ON
p2.Text = p1.Text;
This assumes that your ID is an auto-increment.
Thsi is pretty much like Zak's new answer, but with the 2 update queries merged.

Answer 2

merge [Proj2Table] target
using ( select [id], [text] from [Proj1Table] ) source ([id], [text] )
on target.[id] = source.[id]
when not matched by source
then update
set target.[Active] = 0
when not matched by target
then insert
([id], [text] )
values( source.[id], source.[text] )

Answer 3

-- update records in table 2 that cannot be found in table 1
update P2
set P2.[Active] = 0
from [Proj2Table] as P2
left join [Proj1TAble] as P1 on P1.[text] = P2.[text]
where P1.[id] is null;
-- update records in table 2 that can be found in table 1
update P2
set P2.[Active] = 1
from [Proj2Table] as P2
join [Proj1TAble] as P1 on P1.[text] = P2.[text];
-- insert missing records from table 1 into table 2 with active bit set
insert into [Proj2Table] ([id] , [text] , [active] )
select [id] , [text] , [active] = 1
from [Proj1Table] as P1
where not exists (select 1 from [Proj2Table] as P2 where P2.[text] = P1.[text])
;
Not sure if [id] column should match or is a pk/identity/sequence

Answer 4

Another approach would be to use a cursor, if you really don't want to use MERGE
-declare a cursor on the first table and scroll the row, then for each row selct the corresponding row in the second table and ac accordingly, if found/not found...
not the best performance-related suggestion though...