Consider the following extended relational-algebra operators. Sort and hash each step. Semi-joining (): The multiset semijoin operator r's definition is as follows: if a tuple ri occurs n times in r, it appears n times in r's result if there is at least one tuple sj such that ri and sj meet predicate ; otherwise, ri does not appear.

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
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Consider the following extended relational-algebra operators. Sort and hash each step. Semi-joining (): The multiset semijoin operator r's definition is as follows: if a tuple ri occurs n times in r, it appears n times in r's result if there is at least one tuple sj such that ri and sj meet predicate ; otherwise, ri does not appear.

 

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