In SQL, we have tables containing individual rows. Tables have strict schemas that every row must obey; there are columns with types and other possible constraints: unique, not null, value checks or references to rows of other tables. Referential integrity lies at the heart of this data approach - guarantee that if row B1 of table B references row A1 of table A, referred row (A1) must exist; orphan rows are not allowed. If we want to delete A1 row, there are two options:
He knows that many critics and academics will take issue with his complete dismissal of historical consciousness and sociopolitical context: “The freedom to apprehend aesthetic value may rise from class conflict, but the value is not identical with the freedom,” he says. “There is always guilt in achieved individuality; it is a version of the guilt of being a survivor and is not productive of aesthetic value.” In these passages, Bloom’s arguments against the legacy of late-twentieth-century literary study are the most lucid they would ever be:，这一点在新收录的资料中也有详细论述
。关于这个话题，新收录的资料提供了深入分析
Leader’s centre-right CDU party is hoping to beat Greens in Sunday’s election in Baden-Württemberg，更多细节参见新收录的资料
Он случился в офисе на улице Вольной. Предварительно, неизвестный подорвал банкомат. На месте уже находятся несколько машин спасателей и скорая помощь, уточняет «Осторожно, новости».