Created
March 16, 2011 10:19
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16.03.2011 - Exercise2 - Unit3
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SET SCHEMA PC; | |
--Напишете заявка, която извежда производителите на персонални компютри с честота поне 500. | |
SELECT DISTINCT MAKER | |
FROM PRODUCT | |
WHERE TYPE = 'PC' | |
AND MODEL IN ((SELECT MODEL | |
FROM PC | |
WHERE SPEED >= 500)); | |
--Напишете заявка, която извежда принтерите с най-висока цена. | |
SELECT DISTINCT MODEL | |
FROM PRINTER AS P | |
WHERE PRICE >= ALL (SELECT PRICE | |
FROM PRINTER | |
WHERE P.CODE = CODE AND PRICE IS NOT NULL); | |
--Напишете заявка, която извежда лаптопите, чиято честота е по-ниска от | |
--честотата на който и да е персонален компютър. | |
SELECT MODEL | |
FROM LAPTOP | |
WHERE SPEED < ALL (SELECT SPEED | |
FROM PC); | |
--Напишете заявка, която извежда производителя на цветния принтер с най-ниска цена. | |
SELECT PROD.MAKER | |
FROM PRODUCT AS PROD, PRINTER AS PRINT | |
WHERE PRINT.MODEL = PROD.MODEL AND PRINT.COLOR = 'y' | |
AND PRINT.PRICE <= ALL (SELECT PRICE | |
FROM PRINTER | |
WHERE COLOR = 'y'); | |
--Напишете заявка, която извежда производителите на тези персонални компютри | |
--с най-малко RAM памет, които имат най-бързи процесори | |
SELECT DISTINCT MAKER | |
FROM PC AS P, PRODUCT AS PR | |
WHERE P.MODEL = PR.MODEL | |
AND P.SPEED <= ALL (SELECT SPEED | |
FROM PC | |
WHERE RAM <= ALL (SELECT RAM | |
FROM PC)) | |
AND RAM <= ALL (SELECT RAM | |
FROM PC); |
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