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These are used to limit the type of data that can go into a table.

This ensures the accuracy and reliability of the data in the database.

The fields in the CUSTOMERS table consist of ID, NAME, AGE, ADDRESS and SALARY.

A field is a column in a table that is designed to maintain specific information about every record in the table.

A column is a vertical entity in a table that contains all information associated with a specific field in a table.SQL is a language to operate databases; it includes database creation, deletion, fetching rows, modifying rows, etc.SQL is an ANSI (American National Standards Institute) standard language, but there are many different versions of the SQL language.For example, a column in the CUSTOMERS table is ADDRESS, which represents location description and would be as shown below − A NULL value in a table is a value in a field that appears to be blank, which means a field with a NULL value is a field with no value.It is very important to understand that a NULL value is different than a zero value or a field that contains spaces.

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RDBMS is the basis for SQL, and for all modern database systems like MS SQL Server, IBM DB2, Oracle, My SQL, and Microsoft Access. The data in an RDBMS is stored in database objects which are called as tables.