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Database training
2.2.16. Query optimisation
SQL query
SELECT lname, fname
FROM employee
WHERE salary > (
SELECT MAX(salary)
FROM employee
WHERE dno=5
);
Worst-case
Process inner for each outer
Best-base
Canonical algrebraic form
‹ 2.2.15. Query processing
up
2.2.16b. Query optimisation implementation ›
s5 slideshow
