Query statement execution device, query statement execution method, and query statement execution program

摘要

To improve execution performance of an inquiry sentence, and to make it possible to refer to appropriate data on the basis of content of the inquiry sentence.SOLUTION: A database management device 2 comprises: an acquisition part 224 for acquiring an inquiry sentence corresponding to a database; a determination part 225 for, when an extraction condition for extracting data is included in the acquired inquiry sentence, determining whether or not there is a difference between data corresponding to the extraction condition included in a materialized view preliminarily created correspondingly to one or more tables as a reference destination of the inquiry sentence and data corresponding to the extraction condition included in the table corresponding to the materialized view; and an execution part 226 for, when it is determined that there is difference, executing processing corresponding to the inquiry sentence by referring to the table corresponding to the materialized view, and for, when it is determined that there is not any difference, executing the processing corresponding to the inquiry sentence by referring to the materialized view.SELECTED DRAWING: Figure 2