Question

How to update row if exist A,B,Tarih and Not exist how to insert?

My original Code:

 Insert X(A,B,C,D,E,Tarih)
select substring(dosya,2,25) as A, 
substring(dosya,27,15) as B,
substring(dosya,70,40) as C,
CONVERT(DECIMAL(17,2),substring(dosya,52,17)) as D,
case when substring(dosya,124,2)='00' then 'TL'
     when substring(dosya,124,2)='01' then 'USD'
     when substring(dosya,124,2)='02' then 'CHF'
     when substring(dosya,124,2)='03' then 'CAD'
     when substring(dosya,124,2)='04' then 'KWD'

     when substring(dosya,124,2)='05' then 'GBP'
     when substring(dosya,124,2)='06' then 'SAR'
     when substring(dosya,124,2)='07' then 'JPY'
     when substring(dosya,124,2)='08' then 'EUR'

     when substring(dosya,124,2)='09' then 'AUD'
     when substring(dosya,124,2)='10' then 'IRR'
     when substring(dosya,124,2)='11' then 'DK'
     when substring(dosya,124,2)='12' then 'SEK'
 else 'Döviz' end  as E,
@tarih as Tarih
 from #TempLog

i want to update existing value

Pseudo code :

if exist ( A,B,C in BankaEntegrasyonLog)

{

       Update Row!

}

else

{

 Insert 

X(A,B,C,D,E,Tarih)

select substring(dosya,2,25) as   . . . . .  

}

Answer 1

You’ll want to use the MERGE statement.

First, let’s create a test table:

CREATE TABLE TestLog( SomeKey INTEGER, SomeAttribute VARCHAR(80));

And we can insert some values into it:

INSERT INTO TestLog( SomeKey, SomeAttribute ) VALUES ( 43, 'Something' );
INSERT INTO TestLog( SomeKey, SomeAttribute ) VALUES ( 55, 'Another' );
INSERT INTO TestLog( SomeKey, SomeAttribute ) VALUES ( 77, 'Demo' );

Now, let’s use MERGE with a key that already exists. If we should update ‘Something’ to ‘updated!’ for SomeKey = 43:

MERGE TestLog AS TARGET
USING (SELECT 43 AS SomeKey, 'Updated!' AS SomeAttribute)
AS SOURCE( SomeKey, SomeAttribute )
ON (TARGET.SomeKey = SOURCE.SomeKey )
WHEN MATCHED THEN
   UPDATE SET SomeAttribute = Source.SomeAttribute
WHEN NOT MATCHED THEN
   INSERT (SomeKey, SomeAttribute)
   VALUES (SOURCE.SomeKey, SOURCE.SomeAttribute);

We can check that it worked:

SELECT * FROM TestLog WHERE SomeKey = 43;

and we indeed see “Updated!” for SomeAttribute. We can try a new value:

MERGE TestLog AS TARGET
USING (SELECT 22 AS SomeKey, 'Newone!' AS SomeAttribute)
AS SOURCE( SomeKey, SomeAttribute )
ON (TARGET.SomeKey = SOURCE.SomeKey )
WHEN MATCHED THEN
   UPDATE SET SomeAttribute = Source.SomeAttribute
WHEN NOT MATCHED THEN
   INSERT (SomeKey, SomeAttribute)
   VALUES (SOURCE.SomeKey, SOURCE.SomeAttribute);

And to check it:

SELECT * FROM TestLog;

We indeed see a new fourth row with (22, ‘Newone!’). It shouldn’t be hard to expand this example to your specific table and insert pattern. Let me know if you need more help.