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Snippet Name: FUNCTIONS: Nested Functions

Description: Oracle functions can be placed within other Oracle functions, extending their capability.

Also see:
» FUNCTIONS: Deterministic
» FUNCTIONS: IF statement
» FUNCTIONS: date/time
» FUNCTIONS: Sample functions
» FUNCTIONS: drop
» FUNCTIONS: Recompile
» FUNCTIONS: DEBUG mode
» FUNCTIONS: IN OUT parameter
» FUNCTIONS: with output parameters
» FUNCTIONS: with parameters
» FUNCTIONS: without parameters
» FUNCTIONS: Create function
» FUNCTIONS: special restrictions
» FUNCTIONS: System Privileges
» IN Function
» Built-In Functions: CASE
» Built-In Functions: DECODE
» SUBST and INSTR together
» INSTR (InString)
» SUBSTR (SubString)
» String Functions: REVERSE
» String Functions: LENGTH
» String Functions: INSTR
» String Functions: CONCAT
» String Functions: CHAR
» String Functions: INITCAP
» String Functions: LOWER
» String Functions: UPPER
» Date Functions: NUMTOYMINTERVAL
» Date Functions: NUMTODSINTERVAL

Comment: (none)

Author: CoderZone
Language: PL/SQL
Highlight Mode: PLSQL
Last Modified: March 13th, 2009

CREATE OR REPLACE FUNCTION nested(some_date DATE) RETURN VARCHAR2 IS
 yrstr VARCHAR2(4);
 
-- beginning of nested function in declaration section 
FUNCTION turn_around (
  year_string VARCHAR2)
  RETURN VARCHAR2
IS
 
BEGIN
  yrstr := TO_CHAR(TO_NUMBER(year_string)*2);
  RETURN yrstr;
END;
-- end of nested function in declaration section
 
-- beginning of named function
BEGIN
  yrstr := TO_CHAR(some_date, 'YYYY');
  yrstr := turn_around(yrstr);
  RETURN yrstr; 
END nested;
 
 
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