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Why all variables and datatypes are kept in '[]'

CREATE TABLE [dbo].[tblExerciseMultiMailTypeStructureDetails](
[ExerciseMultiMailID] [int] NOT NULL

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Any name that are same as SQL Server Keywords or containing embaded space must be enclosed in double quotes("") or square brackets([]). Which words are considered as keyword varies,depending on the compatibility level to which you have set your database.