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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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但在保证宽类的前提下，真正考验零售商判断力的，是另一半：“窄品”。
In The Tonight Show clip above he pulls Jimmy Fallon out from behind his desk for an impromptu dance lesson, resulting in much giggling and some impressively quick learning from Fallon.
将基础模型和应用统一在“千问”品牌之下，增强市场辨认度。