发明名称 |
FUNCTIONAL DATABASE SYSTEM |
摘要 |
A functional database system accessible by means of functional expressions. A functional expression in a database is evaluated by compiling the expression into a relational algebra expression in terms of an extended relational algebra and evaluating thecompiled expression by referring to data stored in the database. A function may be called during compilation or interpretation, and the compiler or interpreter may be called recursively as necessary to compile or evaluate the function. The extended relational algebra includes a database update operator, a foreign function operator and a sequence operator.
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申请公布号 |
CA2007391(A1) |
申请公布日期 |
1990.07.10 |
申请号 |
CA19902007391 |
申请日期 |
1990.01.09 |
申请人 |
HEWLETT-PACKARD COMPANY |
发明人 |
LYNGBAEK, PETER;WILKINSON, KEVIN |
分类号 |
G06F9/45;G06F12/00;G06F17/30;(IPC1-7):G06F7/544 |
主分类号 |
G06F9/45 |
代理机构 |
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代理人 |
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地址 |
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