JPH01234931A - Projection processing system for relational data base - Google Patents

Projection processing system for relational data base

Info

Publication number
JPH01234931A
JPH01234931A JP63060350A JP6035088A JPH01234931A JP H01234931 A JPH01234931 A JP H01234931A JP 63060350 A JP63060350 A JP 63060350A JP 6035088 A JP6035088 A JP 6035088A JP H01234931 A JPH01234931 A JP H01234931A
Authority
JP
Japan
Prior art keywords
projection processing
projection
circuit
processing system
data base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP63060350A
Other languages
Japanese (ja)
Inventor
Masami Enohara
Kiyoshi Yada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP63060350A priority Critical patent/JPH01234931A/en
Publication of JPH01234931A publication Critical patent/JPH01234931A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To speed up projection processing by executing the projection processing by means of hardware based upon an exclusive circuit.
CONSTITUTION: A processor 1, a memory 2 and an exclusive circuit 3 for projection processing are connected through various buses. The processor 1 controls the whole data processor and the memory 2 is provided with an input table 21 for a record group to be projected and an output table 22 for storing projected record group in its inside. The circuit 3 is provided with a projection column information buffer 31, an input address counting circuit 32 and an output address counting circuit 33 to execute the reading and writing of a projection column. Since the projecting function is based upon hardware, the projection processing can be rapidly executed.
COPYRIGHT: (C)1989,JPO&Japio
JP63060350A 1988-03-16 1988-03-16 Projection processing system for relational data base Pending JPH01234931A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63060350A JPH01234931A (en) 1988-03-16 1988-03-16 Projection processing system for relational data base

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63060350A JPH01234931A (en) 1988-03-16 1988-03-16 Projection processing system for relational data base

Publications (1)

Publication Number Publication Date
JPH01234931A true JPH01234931A (en) 1989-09-20

Family

ID=13139623

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63060350A Pending JPH01234931A (en) 1988-03-16 1988-03-16 Projection processing system for relational data base

Country Status (1)

Country Link
JP (1) JPH01234931A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5208204A (en) * 1991-10-07 1993-05-04 Ford Motor Company Three-way catalyst for treating emissions from compressed natural gas fueled engines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5208204A (en) * 1991-10-07 1993-05-04 Ford Motor Company Three-way catalyst for treating emissions from compressed natural gas fueled engines

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