Лабораторная работа: Новые операторы языка манипулирования данными (DML)

insert into Cosmetics

values(200,'Garnier Light','Day cream',1900,120,'3/8/2011','Avon','Nurzhanova Asel')

insert into Cosmetics

values(201,'MaxFactor','Eyelash',2300,209,'7/8/2010','Oriflame','Smailova Saya')

insert into Cosmetics

values(202,'Pharma','Makeupremover',3000,260,'11/18/2010','Maybeeline','Tanabaeva Gulzada')

insert into Cosmetics

values(203,'Baby Body','Lotion',300,80,'9/20/2012','Nivea','Erimbetova Laura')

1) CTE - выражения для упрощения читаемости запросов

with first as

(

select *

from Parfums

where destination like 'for women'

)

select * from first

order by price;

2) Однократный вызов CTE

WITH

maxi AS (SELECT (max (amount))AS v FROM Cosmetics),

mini AS (SELECT (min (price))AS v FROM Cosmetics)

SELECT cosmetic_id, cosmetic_name, amount, price

FROM Cosmetics as co, mini, maxi

WHERE co.amount=maxi.v or co.price= mini.v;

3) Использование CTE для рекурсивного прохода по дереву

WITH alphavit AS(

SELECT ASCII('A') code, CHAR(ASCII('A')) letter

UNION ALL

SELECT code+1, CHAR(code+1) FROM alphavit