unique key

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showing results for - "unique key"
Paul
04 May 2018
1CREATE TABLE students  
2(  
3S_Id int NOT NULL,  
4LastName varchar (255) NOT NULL,  
5FirstName varchar (255),  
6City varchar (255),  
7UNIQUE (S_Id)  
8)  
Natalia
13 Aug 2020
1ALTER TABLE students  
2ADD UNIQUE (S_Id)  
Celeste
13 Nov 2016
1Unique Key:
2Only unique value and also can contain NULL
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