how to write the query comparing two table values and insert and update into third table

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Studenteducation table as follows

Studid Mobilenum
1
2
3
4

Student table as follows

Studid
1
2
3
4
5
6
7

Temptable as follows

Studid Mobilenum
1 9789512450
2 9789512650
3 9789455564
4 9785654450
5 9785657888
6 9789518780
7 9789518899
8 9789518890
9 9785654870

I want to compare the Temptable and Studenttable studid.
if Temptable and Studenttable studid matches update the mobileno of particular studid in Studenteducation table

if Temptable and Studenttable studid not matches insert the student id and mobileno of particular studid in Studenteducation table.

for that how can i write the query in sql server.

Rgds,
Narasiman P.

Posted 28-Apr-14 0:35am

Member 8054539

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ArunRajendra · Answer 1 · 2014-04-28T01:28:00

Solution 1

Try this queries.

SQL

UPDATE   se
 SET     se.Mobilenum = t.Mobilenum
FROM    Temptable t INNER JOIN Student s ON t.studid = s.studid inner join  Studenteducation se on se.studid = s.studid

 select *from Studenteducation
 insert into Studenteducation
 select *   from Temptable
 where studid not in (select Studid from Studenteducation  )

Posted 28-Apr-14 1:28am

ArunRajendra

Comments

King Fisher 28-Apr-14 8:23am

skilful ;)

Amin Rizwan Nakhwa · Answer 2 · 2014-04-28T05:20:00

You can use merge also :

SQL

MERGE INTO STUDENTEDUCATION SE USING (SELECT t.studid,t.mobilenum 
                                         FROM TEMPTABLE T,STUDENTTABLE S 
                                        WHERE T.STUDID=S.STUDID) ST 
                                  ON (ST.STUDID=SE.STUDID)
         WHEN NOT MATCHED THEN INSERT (SE.STUDID,SE.MOBILENUM) 
                               VALUES (ST.STUDID,ST.MOBILENUM)
         when matched     then update set se.Mobilenum = st.Mobilenum;