Abstract: When a record inserting section inserts a record having a new column value, the record inserting section registers the column value in a CVT such that an extendible array is extended; registers, in a history table, a history value indicating a chronological sequence of array extension; registers, in a coefficient table, coefficients of a linear function for calculating an offset of an element in an subarray; registers an initial value in a record number table; and inserts as a key value a 2-tuple expression of the history value and the offset of the element of the extendible array into RDT. This makes it possible to dynamically add, upon operation, a record having a new column value and to register only an existing record, thereby realizing a relational database allowing for fast record retrieval.

Abstract: A bowling shoe construction having various options for adjustment with removable and replaceable slide parts to attach to the tread surface of a slide shoe. The slide parts can attach interchangeably using hook and pile loop fasteners. A kick shoe includes an interchangeable kick part covering the toe area. The kick part can be attached using adhesives or hook and pile loop fasteners.