Data base virtual result

 ² Data base virtual result :- 

1. Virtual table is a predefined table in a database.

Ex:-SELECT 10+20-30+40 AS result;

SELECT CAST(10.5 AS INT ) AS result;

 

SELECT TOP 2 * FROM STUDENT_DETAIL;

 

SELECT * FROM STUDENT_DETAIL WHERE ROLL IS NULL;

 

SELECT * FROM STUDENT_DETAIL WHERE ROLL IS  NOT NULL;

 

 

SELECT BRANCH + '' + NAME AS 'STUDENT NAME' FROM STUDENT_DETAIL; 

 

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