unique constraint mssql

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Charissa
14 Nov 2019
1ALTER TABLE table_name ADD CONSTRAINT cst_name UNIQUE (col_name); 
2ALTER TABLE table_name ADD CONSTRAINT cst_name UNIQUE (col1, col2); -- Multiple
3ALTER TABLE table_name ADD col_name NUMBER UNIQUE;				  	-- New field
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Laurine
24 Aug 2020
1USE AdventureWorks2012;  
2GO  
3CREATE TABLE Production.TransactionHistoryArchive4  
4 (  
5   TransactionID int NOT NULL,   
6   CONSTRAINT AK_TransactionID UNIQUE(TransactionID)   
7);   
8GO  
9
10
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