关系型数据库的英文：
SQL database
abbr.
=structured query language 结构化查询语言
- A DBMS compatible with both the ANSI-standard and IBM-standard SQL data base l anguage
一种数据库管理系统(DBMS),它与美国国家标准局(ANSI)的标准和IBM的标准SQL数据库语言都相兼容。Business managers asking this simple question do not know that to implement it, an RDBMS programmer must churn out and test several pages of SQL code to first calculate the profitability of products, then rank them by profitability, and then calculate the13- week average sales.
问这个简单问题的业务经理不知道为实现之，rdbms程序员必须艰苦地编出和测试几页的sql程序代码，以首先算出产品的利润率，再按利润率给它们排队，然后算出它们十三周的平均销售额。
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