Oracle SQL & PL/SQL

> The " DUAL " table is a one row and one column table. The owner of this table is "SYS" but it's accessible to all the db users.  > It is having single column called as " DUMMY " > It is used to test SQL expression with out querying to the main/real tables.  Eg : 1> SELECT SYSDATE FROM DUAL; O.P : It will print current date and time.       2> SELECT 'Hello, Welcome to SQL' from DUAL; O.P :  3> SELECT 5*9 AS RESULT FROM DUAL; O.P:  #SQL #LEARNSQL #DUALTABLE