Syntax of function

Question

hey hii
i just wanted to know that is there any way to just find the syntax a inbuilt function in oracle??
like we have in cmd in windows or ny other thing the help command so we can know waht r the arguments required in that function.

Answer 1

810345 wrote:
say my function is substr how can i know abt its arguments using dictionaryIn general, there is no way to get SQL function arguments from data dictionary. However, for SQL functions that have a matching PL/SQL function, you could use USER/ALL/DBA_ARGUMENTS:
SELECT  CASE ROW_NUMBER() OVER(PARTITION BY OVERLOAD ORDER BY POSITION)
          WHEN 1 THEN 'FUNCTION ' || OBJECT_NAME || ' RETURNS ' || DATA_TYPE
        END FUNCTION,
        CASE ROW_NUMBER() OVER(PARTITION BY OVERLOAD ORDER BY POSITION)
          WHEN 1 THEN NULL
          ELSE ARGUMENT_NAME || ' ' || DATA_TYPE || ' ' || IN_OUT
        END AGRUMENT,
                CASE ROW_NUMBER() OVER(PARTITION BY OVERLOAD ORDER BY POSITION)
          WHEN 1 THEN NULL
          ELSE DEFAULT_VALUE
        END DEFAULT_VALUE
  FROM  DBA_ARGUMENTS
  WHERE OWNER = 'SYS'
    AND PACKAGE_NAME = 'STANDARD'
    AND OBJECT_NAME = 'SUBSTR'
FUNCTION                                 AGRUMENT                       DEFAULT_VALUE
FUNCTION SUBSTR RETURNS VARCHAR2
                                         STR1 VARCHAR2 IN
                                         POS BINARY_INTEGER IN
                                         LEN BINARY_INTEGER IN
FUNCTION SUBSTR RETURNS CLOB
                                         STR1 CLOB IN
                                         POS NUMBER IN
                                         LEN NUMBER IN
8 rows selected.
SQL> However, it will not work for function like NVL2 which does not exist in PL/SQL:
SELECT  CASE ROW_NUMBER() OVER(PARTITION BY OVERLOAD ORDER BY POSITION)
          WHEN 1 THEN 'FUNCTION ' || OBJECT_NAME || ' RETURNS ' || DATA_TYPE
        END FUNCTION,
        CASE ROW_NUMBER() OVER(PARTITION BY OVERLOAD ORDER BY POSITION)
          WHEN 1 THEN NULL
          ELSE ARGUMENT_NAME || ' ' || DATA_TYPE || ' ' || IN_OUT
        END AGRUMENT,
                CASE ROW_NUMBER() OVER(PARTITION BY OVERLOAD ORDER BY POSITION)
          WHEN 1 THEN NULL
          ELSE DEFAULT_VALUE
        END DEFAULT_VALUE
  FROM  DBA_ARGUMENTS
  WHERE OWNER = 'SYS'
    AND PACKAGE_NAME = 'STANDARD'
    AND OBJECT_NAME = 'NVL2'
no rows selected
SQL>SY.