update a table with results from other table

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Hi I have a table which consists of a set of students data(Students) and a new table (Applicants). The columns in those tables are:

Students:
Stud_Id
Stud_Name
Institute_Id

Applicants:
App_Id
App_Name
Inst_Id

Stud_Id and App_Id are the same dataset. What I am going to do now is i want to update Applicants table, which I want to insert Institute_Id into Inst_Id using Students.Stud_Id = Applicants.App_Id.

I have tried a little. But error came out. How can i fix this?

SQL

UPDATE a SET a.Inst_Id = (select s.Institute_Id from Applicants a inner join Students s on a.App_Id = s.Stud_Id)
FROM Applicants a
INNER JOIN Students s ON a.App_Id = s.Stud_Id

Posted 10-Aug-11 17:58pm

snamyna

Updated 10-Aug-11 18:03pm

Tarakeshwar Reddy

v2

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walterhevedeich 11-Aug-11 0:10am

Whats the error?
And this is somewhat confusing.
What I am going to do now is i want to update Applicants table, which I want to insert Institute_Id into Inst_Id using Students.Stud_Id = Applicants.App_Id. Update and insert? Elaborate more.

snamyna 11-Aug-11 0:24am

I have Institute_Id data and i want to update the Applicants table by inserting that Institute_Id into Inst_id. But the data must be matched according to their App_Id. The error is, multiple results cannot be inserted. Somehow, the data is different according to Stud_Id.

eg:
Stud_Id : A -----> Institute_Id : UKM
Stud_Id : B -----> Institute_Id : OUM
Stud_Id : C -----> Institute_Id : Nott
Stud_Id : D -----> Institute_Id : BioCorp

I want it to be like this:

App_Id : A -----> Inst_Id : UKM
App_Id : B -----> Inst_Id : OUM
App_Id : C -----> Inst_Id : Nott
App_Id : D -----> Inst_Id : BioCorp

I just want to insert the data into Inst_Id

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Simon_Whale · Answer 1 · 2011-08-10T20:10:00

Solution 1

Without seeing sample data for all tables In the query I would look at the select statement as I believe that it is returning more than one result.

You might be able to change your query to this also (but this has'nt been tested!)

SQL

UPDATE a SET a.Inst_Id = s.Institute_Id 
FROM Applicants a
INNER JOIN Students s ON a.App_Id = s.Stud_Id

Posted 10-Aug-11 20:10pm

Simon_Whale

Updated 10-Aug-11 20:18pm

v2

Comments

snamyna 11-Aug-11 3:05am

ok done with success. thanks simon. :)

Simon_Whale 11-Aug-11 3:54am

your welcome :)