JPH0342773A - Data base retrieving system - Google Patents

Data base retrieving system

Info

Publication number
JPH0342773A
JPH0342773A JP17873389A JP17873389A JPH0342773A JP H0342773 A JPH0342773 A JP H0342773A JP 17873389 A JP17873389 A JP 17873389A JP 17873389 A JP17873389 A JP 17873389A JP H0342773 A JPH0342773 A JP H0342773A
Authority
JP
Grant status
Application
Patent type
Prior art keywords
number
retrieving
cases
order
column
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
JP17873389A
Inventor
Minoru Tamura
Original Assignee
Nec Corp
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

Links

Abstract

PURPOSE: To shorten retrieving time by storing previously the number of cases of the different column values of all records for every column, and determining comparing order to decrease the number of times of evaluation required for the decision of all conditions from this number of cases of the different values, and retrieving a data base in conformity to this order.
CONSTITUTION: The information of the length of each column in which the data of each data attribution, etc., is stored is stored in a storage area 103, and the number of cases of the different values of the corresponding column for all the records in a table definition is stored previously in the storage area 104. Then, the retrieving order to decrease the number of times of the evaluation of the conditions is determined by a determining means 105 from the number of cases of the different values in the area 104, and the record to satisfy a retrieving condition 101 is retrieved from among the records in a record storage area 106 by a retrieving means 107 in conformity to this order, and its result is outputted from an output means 108.
COPYRIGHT: (C)1991,JPO&Japio
JP17873389A 1989-07-11 1989-07-11 Data base retrieving system Pending JPH0342773A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17873389A JPH0342773A (en) 1989-07-11 1989-07-11 Data base retrieving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17873389A JPH0342773A (en) 1989-07-11 1989-07-11 Data base retrieving system

Publications (1)

Publication Number Publication Date
JPH0342773A true true JPH0342773A (en) 1991-02-22

Family

ID=16053634

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17873389A Pending JPH0342773A (en) 1989-07-11 1989-07-11 Data base retrieving system

Country Status (1)

Country Link
JP (1) JPH0342773A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07219825A (en) * 1993-01-07 1995-08-18 Internatl Business Mach Corp <Ibm> Method for selecting connection selectiveness for reference optimizer and relational data base managing system

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07219825A (en) * 1993-01-07 1995-08-18 Internatl Business Mach Corp <Ibm> Method for selecting connection selectiveness for reference optimizer and relational data base managing system

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