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Carnegie Mellon Univ. Dept. of Computer Science 15-415 - Database Applications

Carnegie Mellon Univ. Dept. of Computer Science 15-415 - Database Applications. C. Faloutsos Rel. model - SQL part1. General Overview - rel. model. Formal query languages rel algebra and calculi Commercial query languages SQL QBE, (QUEL). Overview - detailed - SQL. DML

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666 views • 48 slides

Carnegie Mellon Univ. Dept. of Computer Science 15-415 - Database Applications

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510 views • 48 slides

Query Optimization

sname. rating &gt; 5. bid=100 . (Simple Nested Loops). sid=sid. Sailors. Reserves. Query Optimization. Goal:. Declarative SQL query. Imperative query execution plan:. SELECT S.sname FROM Reserves R, Sailors S WHERE R.sid=S.sid AND R.bid=100 AND S.rating&gt;5.

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