Update query for 2 table

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Hi All
i have this Query Below

string updateReq = "UPDATE Student SET Student.ID_Request = Request.ID_Request FROM Request where Student.St_Code=Request.St_Code   INNER JOIN  Request ON Student.ID_Request = Request.ID_Request";

but when i excute this i get this error :

The objects "Request" and "Request" in the FROM clause have the same exposed names. Use correlation names to distinguish them.

how can i solve this ?

What I have tried:

i tried to select the records in the temp table but it doesn't work or maybe i do it wrong

string select = "SELECT * INTO #TempTable FROM Student s where ID_Request IS NULL";

string updateReq = "UPDATE TempTable SET s.ID_Request = Request.ID_Request FROM Request where Student.St_Code=Request.St_Code   INNER JOIN  Request ON Student.ID_Request = Request.ID_Request";

when i excute these string i get the same error

Posted 3-Nov-17 9:57am

Member 13019612

Updated 3-Nov-17 17:47pm

v2

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Santosh kumar Pithani 3-Nov-17 23:56pm

Don't post like this question, "filter(where) condition always comes after join.

2 solutions

Solution 1

You have to distinguish between the two instances of the same table. I will try to help but I'm doing this on a phone...

SQL

string updateReq = "UPDATE Student SET Student.ID_Request = R1.ID_Request FROM Request R1 where Student.St_Code=Request.St_Code INNER JOIN Request R2 ON Student.ID_Request = R2.ID_Request";

I can't test this but note that I've given the tables an alias each.

Posted 3-Nov-17 11:58am

CHill60

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Santosh kumar Pithani · Accepted Answer · 2017-11-03T17:47:00

Solution 2

UPDATE Student SET Student.ID_Request = R1.ID_Request
     FROM Request R1  
          INNER JOIN Request R2 
             ON (Student.ID_Request = R2.ID_Request) 
          INNER JOIN  Student 
             ON (Student.St_Code=R2.St_Code)

Posted 3-Nov-17 17:47pm

Santosh kumar Pithani