17:41, 27 февраля 2026Наука и техника
“These alerts are designed to make sure parents are aware if their teen is repeatedly trying to search for this content, and to give them the resources they need to support their teen,” the company said in a release.
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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: