Method and apparatus for a complete SQL subquery elimination pro

Details Method and apparatus for a complete SQL subquery elimination pro Method and apparatus for a complete SQL subquery elimination pro

1995-06-07

1998-03-03

Black, Thomas G.

395604, G06F 1730

Patent

active

057245703

ABSTRACT:
A method for subquery elimination for a relational model database based on the SQL language running a database management system (DBMS) under the TANDEM NONSTOP (tm) operating kernel. A series of seven transformation rules are applied to eliminate nested queries in the SQL language. The method and teachings of the present invention generalizes to all types of nested subqueries in SQL, allowing for more efficient computations, allocation and maintenance of system resources.

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