SQL92 standard SQL99 document is a database ANSI/ISO standards. The predecessor of this standard is SQL92 ANSI/ISO standards, before SQL92 There is also a SQL89 ANSI/ISO standards. It defines a language (SQL) and database behavior (services, isolation level, etc.). Do you know of many commercial databases in a way at least is in line with the SQL99 it? However, inquiries and applications for portability does not mean much, you also clearly? SQL92 standard has four levels.

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SQL92标准1824_ref_858.txt

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