Mavzu: Agrеgat funksiyalardan

VIEW yaratish va o‟chirishning so‟rovi sintaksisi CREATE VIEW tasavvur_nomi AS

SELECT ustun1, ustun2, ... FROM jadval_nomi WHERE shartli_tenglik;

DROP VIEW tasavvur_nomi; Masalan:
CREATE VIEW Braziliya_xaridorlari AS SELECT xaridor_familiyasi, xaridor_ismi FROM xaridorlar
WHERE mamlakat = "Braziliya"; DROP VIEW Braziliya;

Ishni bajarish tartibi

1. 
   Maxsulot jadvalidan 4000 dan ko‘p maxsulotlarni aks ettiruvchi Viewni yaratamiz:
   

So`rov: Create view 2000_dan_kattalarini as select FIO from xodimlar where tugulgan_yili>2000;

Natija:

1. 
   – rasm. View yaratilishi.
   

2. 
   Tasavvur (view)ni ko‘ramiz:
   

So`rov: Select * from 2000_dan_kattalarini;

Natija:

2. 
   – rasm. Yaratilgan Viewdagi ma‘lumotlarni ko‘rish.
   

3. 
   Tasavvurni o‘chirish:
   

So`rov: Drop view 2000_dan_kattalarini;

Natija:

3. 
   – rasm. Viewni ma‘lumotlar bazasidan o‘chirish.