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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:
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Early nesting birds have lost eggs, and conservationists warn spring may bring noticeably fewer butterflies and insects as floodwaters have swept away eggs and overwintering larvae.
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第七十八条 除依据本法第七十六条的规定作出批注外，承运人或者代其签发提单的人签发的提单，是承运人已经按照提单所载状况收到货物或者货物已经装船的初步证据；承运人向包括收货人在内的善意第三人提出的货物状况与提单记载不同的证据，不予承认。，这一点在爱思助手下载最新版本中也有详细论述
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