registers. Register allocation decides which variables live in registers and
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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Kosmos 482, which launched in 1972 on a mission to Venus, never made it out of Earth's orbit and instead broke into four pieces that have been circling the planet for more than five decades.
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熏豆腐、孔府菜一字排开，百余米的长街宴座无虚席。“人多吃着香。”来自辽宁的张丽英说，“这热闹劲儿，像我们小时候过年。”
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