How to check duplication is SQL Stored procedure

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I have the values as below and i need to check the duplication.

empno deptid
----- ------
101 1
102 2
103 3

checking duplicates condition
-----------------------------

1) if empno is null and depid = '1'
ERROR "Dept Already Exists"
2) if empno = '101' and depid = ''
ERROR "Emp Already Exists"
3) if empno = '101' and depid = '1'
ERROR "Emp/Dept already exist"
ELSE
INSERT the values into table

Posted 28-Nov-12 0:39am

gani7787

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Corporal Agarn 28-Nov-12 12:28pm

What have you tried? Also is for #2 is depid ever null?
So you can have only unique empno numbers AND unique depid numbers?

DaleMoz 28-Nov-12 19:04pm

Are you dealing with only one table here? What is the relationship between Emp and Dep?

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Nelly2k · Accepted Answer · 2012-11-28T15:24:00

SQL

IF (SELECT COUNT(*) FROM tb WHERE empno=@empno AND deptid=@deptid ) > 0
 PRINT "Emp/Dept already exist&";
ELSE IF (SELECT COUNT(*) FROM tb WHERE empno IS NULL AND deptid=@deptid ) > 0
 PRINT "ERROR Dept already exists";
ELSE IF  (SELECT COUNT(*) FROM tb WHERE empno=@empno AND deptid='') > 0
 PRINT"Emp Already Exists&";
ELSE
 INSERT INTO tb VALUES(@empno, @deptid)

tb - your table, @empno,@deptid - stored procedure input parameters