SQL – VIEW AND DUAL

SQL - VIEW AND DUAL

SQL – VIEW SQL – DUAL: Here, we will realize what is VIEW, how to make VIEW and how it thinks about the tables?

A VIEW is a virtual table, through wish we can choose a little part of the information from at least one table, and it limits the entrance on the first table/information. Any progressions done on the information in view will ponder the tables from which information is taken.

A DUAL is an exceptional one section and one line which can be utilized to do little estimations and tasks and so on.

Test table (Student),

SQL - VIEW AND DUAL

1) Create a view from the understudy table

CREATE VIEW first_view AS SELECT student_name, City from Student;

To see this table we have to utilize the SELECT query.

SELECT * FROM first_view;

Here, first_view: it is the name of the virtual table

SQL - VIEW AND DUAL

2) Use DUAL to get the current date

SELECT SYSDATE() FROM DUAL;

Will return the current date from the framework.

SQL - VIEW AND DUAL

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