2 coloumns in table have depend upon each other to avoid data duplication? How

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SQL-Server-2008R2

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I want to avoid duplication of data suppose i have a table name Schema_tbl that holds 2 coloums
Schema_tbl columns are :
tblNames | primaryKeysCol
data:
tblCustomer | cmpid
tblCustomer | brchid
tblCustomer | pkid
--duplicated values --
tblCustomer | cmpid

now how to make a composite key that avoids the duplicated of data in primary key coloumns agains composite key

What I have tried:

NOTHING ONLY DEVELOPED SCHEMA I GOOGLED BUT FOUND SOLUTION THAT COMPOSITE KEYS WILL BE APPLIED BUT HOW TO

Posted 13-Jul-16 22:33pm

Engr Nouman

Updated 13-Jul-16 23:24pm

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Suvendu Shekhar Giri · Answer 1 · 2016-07-13T23:24:00

Solution 1

Try-

SQL

ALTER TABLE Schema_tbl
    ADD CONSTRAINT pk_myConstraint PRIMARY KEY (tblNames,primaryKeysCol)

Hope, it helps :)

Posted 13-Jul-16 23:24pm

Suvendu Shekhar Giri