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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Functions
Like a procedure, a function is also a derivative of a PL/SQL block structure which is physically stored within a database. Unlike procedures, they are the "workforce" in PL/SQL and meant for calculative and computational activities in the applications.
The characteristics of functions are as follows:
- Functions can be called from SQL statements (
SELECTand DMLs). Such functions must accept onlyINparameters of valid SQL types. Alternatively, a function can also be invoked fromSELECTstatements if the function body obeys the database purity rules. - Functions can accept parameters in all three modes (
IN,OUT, andINOUT) and mandatorily return a value. The type of the return value must be a valid SQL data type (not be ofBOOLEAN,RECORD ...
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