The @Column annotation is used to specify the details of the column to which a field or property will be mapped. You can use column annotation with the following most commonly used attributes:

• name attribute permits the name of the column to be explicitly specified.
• length attribute permits the size of the column used to map a value particularly for a String value.
• nullable attribute permits the column to be marked NOT NULL when the schema is generated.
• unique attribute permits the column to be marked as containing only unique values.

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