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:
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法律條文32年來未曾變更，但以「寵物友善」作招徠的餐廳、購物商場已日趨常見。香港餐飲聯業協會主席楊振年對BBC中文說：「譬如啟德那邊，再加上西九文化區那邊，其實整個範圍都是寵物友善的。再加上維多利亞港兩邊有很多海濱，都有很多餐廳，也有很多人拿著寵物來。」。业内人士推荐体育直播作为进阶阅读
type Option struct {
Иран назвал путь к прекращению войны14:05。关于这个话题，体育直播提供了深入分析