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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莫納漢強調，正是這些細膩的語用差別，讓那些新興語言學習科技所做的宏大承諾值得打上問號。
Smalltalk’s Browser: Unbeatable, Yet Not EnoughSmalltalk is one of those systems that looks “old” until you realize it was often first. Many things we take for granted in modern IDEs—live inspection, tight feedback loops, powerful navigation—were part of Smalltalk culture decades ago.，推荐阅读safew官方版本下载获取更多信息