Introduction to Database Systems Queries in SQL The select ...
Introduction to Database Systems Queries in SQL The select ...
Introduction to Database Systems Queries in SQL The select ...
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Intersection by Way of Nest<strong>in</strong>g<br />
<strong>select</strong> name from employee<br />
<strong>in</strong>tersection<br />
<strong>select</strong> lastName as name from employee<br />
<strong>select</strong> name<br />
from employee<br />
where name <strong>in</strong> (<strong>select</strong> lastName<br />
from employee)<br />
<strong>select</strong> name<br />
from employee e<br />
where exists (<strong>select</strong> *<br />
from employee<br />
where lastName = e.name)<br />
95<br />
Intersection Without Nest<strong>in</strong>g<br />
Is it possible <strong>to</strong> express <strong>in</strong>tersection without nest<strong>in</strong>g?<br />
<strong>select</strong> name from employee<br />
<strong>in</strong>tersection<br />
<strong>select</strong> lastName as name from employee<br />
96
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