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

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I need to add a specific column if it does not exist. I have something like the following, but it always returns false:

IF EXISTS(SELECT *
          FROM   INFORMATION_SCHEMA.COLUMNS
          WHERE  TABLE_NAME = 'myTableName'
                 AND COLUMN_NAME = 'myColumnName')

How can I check if a column exists in a table of the SQL Server database?

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