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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:，这一点在PDF资料中也有详细论述
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华泰证券分析师拆解了霍尔木兹海峡的货流结构：经此出口的甲醇占全球贸易量32%，尿素占33%。2025年6月伊沙冲突期间，伊朗削减气头化工原料供应仅两周，中国甲醇港口价格就飙涨300元至2700元/吨以上，中东尿素FOB价格上涨30-50美元。这一次，冲突烈度远超以往。，详情可参考纸飞机下载
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