COST-BASED SUBQUERY CORRELATION AND DECORRELATION

COST-BASED SUBQUERY CORRELATION AND DECORRELATION

Techniques are provided that determine that a query includes at least one subquery that may be correlated or decorrelated. An internal representation of the query that represents the subquery in both correlated and decorrelated form is generated, wherein the internal representation includes at least...

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Bibliographische Detailangaben
Hauptverfasser: LIU IRENE CHING-HUA, NI DEMAI, BEAVIN THOMAS ABEL, MUKAI JERRY, LIN FEN-LING, XIA LI, CHEN YAOING STEPHEN, TSUJI YOICHI, CAI MENGCHU, CHENG HSIUYING YEN, ZENG YING
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
PHYSICS
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Beschreibung
Zusammenfassung:Techniques are provided that determine that a query includes at least one subquery that may be correlated or decorrelated. An internal representation of the query that represents the subquery in both correlated and decorrelated form is generated, wherein the internal representation includes at least one virtual table.