The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 03, 2021
Filed:
Nov. 02, 2018
International Business Machines Corporation, Armonk, NY (US);
Michal Bodziony, Tegoborze, PL;
Marcin Luczynski, Cracow, PL;
Tomasz Zatorski, Cracow, PL;
Andrzej Laskawiec, Cracow, PL;
Lukasz S. Studzienny, Cracow, PL;
Marcin Filip, Cracow, PL;
Monika Piatek, Cracow, PL;
International Business Machines Corporation, Armonk, NY (US);
Abstract
An approach is provided for encrypting data. Using an encryption function, values of keys in a first database table are encrypted. The encryption function is determined to be homomorphic to sorting operators. A decryption function that decrypts the encrypted keys is determined to be homomorphic to sorting operators. Responsive to the encryption and decryption functions being determined to be homomorphic, a merge join operation is selected. The merge join operation operates on the first database table and a second database table and includes the decryption function in a joining condition. Using the merge join operation, an execution of a query is optimized. The query accesses one or more data items in the first or second database table.