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(57) ABSTRACT A streaming database management system may provide Sup port for creating a new continuous query operator for on-the fly addition of a new query, eg, a new SQL query and/or new continuous query operator, into a shared continuous query plan. Alternatively, the streaming database management sys tem may associate the new query on-the-fly with an existing continuous query operator, Such as a relational operator and expression evaluator, to reuse the existing continuous query operator. In some embodiments, multiple operators are grouped for on-the-fly addition to the shared continuous query plan. Alternatively, the streaming database manage ment system may identify a group of multiple operators in the shared continuous query plan for reuse by the new query. 17 Claims, 10 Drawing Sheets