Preamble
Oracle PL/SQL Functions
| Function | Description |
| BFILENAME | The Oracle/PLSQL function returns the BFILENAME locator corresponding to the operating system’s physical filename file name. |
| CARDINALITY | Oracle/PLSQL function CARDINALITY returns the number of elements in the nested table. |
| COALESCE | Oracle/PLSQL function COALESCE returns the first non-zero expression from the list. If all expressions are defined as Null, the COALESCE function will return Null. |
| DECODE | Oracle/PLSQL function DECODE has functionality of IF-THEN-ELSE operator. |
| EMPTY_BLOB | Oracle/PLSQL function EMPTY_BLOB can be used to initialize empty LOB columns in INSERT or UPDATE operators or it can be used to initialize LOB variable. |
| EMPTY_CLOB | Oracle/PLSQL function EMPTY_CLOB can be used to initialize empty LOB columns in INSERT or UPDATE operators or it can be used to initialize LOB variable. |
| GROUP_ID | Oracle/PLSQL function GROUP_ID assigns a number to each group as a result of GROUP BY operator. GROUP_ID function is most often used to identify duplicate groups in query results. |
| LNNVL | Oracle/PLSQL function LNNVL is used in the WHERE SQL query sentence to evaluate the state when one of the operands may contain the value NULL. |
| NANVL | The Oracle/PLSQL function NANVL allows you to replace a value for a floating point number such as BINARY_FLOAT or BINARY_DOUBLE when Nan (Not a number) is encountered. This is most often used to convert the value Nan (Not a number) to NULL or 0. |
| NULLIF | Oracle/PLSQL function NULLIF compares expr1 and expr2. If expr1 and expr2 are equal, the function NULLIF returns NULL. Otherwise, it returns expr1. |
| NVL | Oracle/PLSQL function NVL allows you to replace the value when there is a Null value. |
| NVL2 | Oracle/PLSQL function NVL2 extends the functionality of the NVL function. It replaces the value when a Null value is encountered and also when a non-Null value is encountered. |
| SQLCODE | The SQLCODE function returns the error number associated with an exceptional situation. This function can only be used in the exception handling section of your code. |
| SQLERRM | The SQLERRM function returns an error message related to an exceptional situation. This function can only be used in the exception handling section of your code. |
| SYS_CONTEXT | Oracle/PLSQL function SYS_CONTEXT is used to get information about the state of Oracle environment. |
| UID | Oracle/PLSQL function UID returns an integer number identifying the current database user. |
| USER | Oracle/PLSQL function USER returns user_id from the current Oracle session. |
| USERENV | Oracle/PLSQL function USERENV is used to get information about the current Oracle session. Although this function still exists in Oracle for backward compatibility, it is recommended to use the sys_context function instead. |
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