sql server - Inserting distinct value in one column and repeated value in other -


I have a database table with only 2 columns: TaskID & amp; Email When a user clicks on a button, he inserts a value in the table. I have written a stored procedure: 

  proc spTaskPerformed @TaskId int, @mail varchar (100) Insert into TblTaskPerformed values ​​(@ TaskID, @ Email) end   
 But I want to add only when TaskId distict. If I use the distict keyword for TaskId for a particular email, it allows me to include the same workcard, even if the email is changed . help.  
  
 
 
 If you want the pairs to be unique, you should have a unique force on prices:  
  create tblTaskPerformed (task id, email) at tblTaskPerformed_TaskId_Email;   
 This will prevent duplicates in the table.  
 If you do not want the stored procedure to generate an error, then you  try  /  hold  statement to catch such errors.

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