Database management system, device and manner

摘要

The value of ID of the record adaptation to conditional expression concerning each conditional expression where DBMS, logical expression and each conditional expression specifies from search kueri, specifies, is selected. DBMS inside information of the logical expression decision which is the information which includes the decision set which possesses with the value of record ID and the multiple compatible result values which correspond to multiple conditional expressions respectively, alteration the record ID value which is selected and the compatible result value which corresponds to conditional expression, in the 1st value which means adaptation, logic operation the multiple compatible result values which decision set has concerning each decision set in the information of logical expression decision, on the basis of logical expression. As for DBMS, the record which corresponds to the record ID value adaptation to the record ID value which the decision set to which you can obtain the 1st value which means adaptation as a result of logical operation has, is searched from the table which is specified with search kueri, the search result information regarding the result of that search is output.