Oracle International Corporation

Christopher Evans

Paolo Fragapane

Andrew P Osborn

James Adam Steadman

Stephen D Cave

Suresh Mali

Kathryn Nash

Jitendra Dhamija

A query generator for generating a query for retrieving data from a database comprising at least one table is disclosed. The query refers to one or more data items in a first view defined to expose a portion of the database and to one or more data items that are not exposed by the first view, at least one of which has an associated reach through flag set thereby defining it as a reach through item. The query generator is adapted to: receive user input indicating selected items to be retrieved from the database; ascertain whether any of the selected items that are not exposed by the first view are defined as reach through items; and, if so: create a second view that is a copy of the first view and add a copy of each reach through item to it; and create a query that refers only to the second view and the items exposed by it.

Query generator

A method of modifying a Structured Query Language (SQL) statement in order to reduce the number of joins executed by a database is disclosed. The method includes presenting the SQL statement to the database and identifying joins in the SQL statement for removal in accordance with one or more predetermined criteria. For each identified join, the SQL statement may be modified so as to remove the identified join and to change references to a first instance of a table which is referred to by the identified join to a second instance of the table.

Structured query language table merging

A method of rewriting a Structured Query Language (SQL) statement in order to prevent processing of a join between a master table and a detail table in a database is disclosed. The method includes determining in the SQL statement a unique identifier to a row of the master table. The unique identifier is then equated to an identifier to related rows of the detail table using the join condition. A revised SQL statement may then be produced that only refers to the detail table using the identifier to the rows of the detail table. Subsequently, the revised SQL statement is processed.

SQL predicate migration

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Bristol, United Kingdom

Christopher Evans