PSY631 FINAL TERM PAST PAPER
The consequence of such a cycle is another connection comprising of the tuples chose from the parent connection. The result of choosing data about a specific worker brings about a connection containing only one tuple from the EMPLOYEE connection.
The result of choosing the tuples related with a specific office brings about a connection that likely contains a few tuples from the JOB connection.
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One activity we should perform on a connection is to choose tuples having specific attributes and to put these chose tuples in another connection. To communicate this activity, we take on the grammar. PSY631 FINAL TERM PAST PAPER
NEW <-SELECT from EMPLOYEE where EmplId = ’34Y70′ The semantics of this assertion is to make another connection called NEW containing those tuples (there should be only one for this situation) from the connection EMPLOYEE whose EmplId property rises to 34Y70 (Figure 113).
PSY631 FINAL TERM PAST PAPER
As opposed to the SELECT activity, which concentrates lines from a connection, the PROJECT activity separates sections. Assume, for instance, that in looking for the gig titles in a specific office, we had previously chosen the tuples from the JOB connection that related to the objective office and set these tuples in another connection called NEW1.
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