Constraint ( NOT NULL ) The NOT NULL constraint enforces a column to NOT accept NULL values. The NOT NULL constraint enforces a field to always contain a v…

Select Into   The SELECT INTO statement selects data from one table and inserts it into a different table. The SELECT INTO statement is most often used to c…

Structured Query Language tutorial( where clause ) The WHERE clause is used to extract only those records that fulfill a specified criterion. SQL WHERE S…

Structured Query Language tutorial (select command ): This  will explain the SELECT and the SELECT * statements. The SELECT statement is used to select data …