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How to check if a column exists in table -SQL Server

In this tutorial i will check  'TestCulumns' column exists in a table, when its not exist, add this column.


IF EXISTS(
    SELECT *
    FROM sys.columns 
    WHERE Name      = N'TestCulumns'
      AND Object_ID = Object_ID(N'Categories'))
BEGIN    
   SELECT * FROM Categories;
END

ELSE
BEGIN
 ALTER TABLE Categories
 ADD TestCulumns VARCHAR(20);
END

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