update same field of one table to another table

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SQL-Server-2008

hi
i have two table, tablemain and tablesecond

In main table , the fieldname rollno have 20 record.

now i made tablesecond. , table second also have same field name rollno.

i need to update the rollno of table second from roll no of first table.

how i achieve this please help!

Posted 13-Jul-12 21:17pm

balongi

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Sandeep Mewara · Answer 1 · 2012-07-13T22:21:00

I cant change constraint,, can you give me sub query
No body is asking you to change any constraint. You have a wrong design and you are being asked to correct it. This clearly should be Foreign Key candidate.

Instead of trying to update/correct the rollno field in both tables everytime, you should fix the table design and make sure that main table rollno is a foreign key of tablesecond.

Still, if you want to update roll no from table 1 to table 2, then first you need to get the missing rollno in table2 and then insert them.

SQL

Select Rollno FROM mainTable Where rollno NOT IN (Select Rollno from TableSecond)

Either in SP or code, you need to loop through these rollno to insert and match the two tables.

Arjun YK · Answer 2 · 2012-07-13T21:43:00

Solution 1

Use Foreign Key concept u'll be able to solve your problem. make sure the rollno column of first table is made as primary key.

Posted 13-Jul-12 21:43pm

Arjun YK

Comments

balongi 14-Jul-12 3:54am

I cant change constraint,, can you give me sub query

Prosan · Answer 3 · 2012-07-15T19:06:00

Solution 3

use AFTER UPDATE Trigger/AFTRE INSERT Trigger for this problem
for more detail for trigger look this Article[^]

Posted 15-Jul-12 19:06pm

Prosan

Updated 15-Jul-12 19:11pm

v3