May 2012
Intermediate to advanced
440 pages
9h 1m
English
Content preview from Oracle Advanced PL/SQL Developer Professional GuideBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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PL/SQL collection methods
Oracle provides a set of methods which can be used in conjunction with collections in PL/SQL blocks. These methods access a collection type variable and perform relevant activities such as extension, trimming, and deleting collection elements. Besides these activities, few methods also provide information about the collection such as COUNT and EXISTS. These utilities are known as collection methods and they are not a built-in subprogram, because they can be used exclusively in conjunction with collections.
The common syntax for all the collection methods is as follows:
[COLLECTION].METHOD (PARAMETERS)
EXISTS
The EXISTS function checks the existence of an element in a collection. The general syntax of this function is EXISTS(<index>) ...
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