SQL

[DmitryS]

Учебники по SQL (Structured Query Language — «язык структурированных запросов»).

Пример кода:

DROP TABLE DROP TABLE ACCESS; CREATE TABLE ACCESS ( id INTEGER, person_id INTEGER, object_id INTEGER, serial TEXT, date_from DATE, date_to DATE, about INTEGER ); SELECT first.cname, second.cname, first.rating FROM Customers first, Customers second WHERE first.rating = second.rating AND first.cname < second.cname;