What is NVL in Oracle SQL?
The Oracle NVL() function allows you to replace null with a more meaningful alternative in the results of a query. The NVL() function accepts two arguments. If e1 evaluates to null, then NVL() function returns e2 . If e1 evaluates to non-null, the NVL() function returns e1 .
How do I write NVL in SQL?
Another example using the NVL function in Oracle/PLSQL is: SELECT supplier_id, NVL(supplier_desc, supplier_name) FROM suppliers; This SQL statement would return the supplier_name field if the supplier_desc contained a null value. Otherwise, it would return the supplier_desc.
What is NVL in SQL full form?
The abbreviation NVL stands for “Null Value”.
IS NULL function in Oracle SQL?
The NULLIF function was introduced in Oracle 9i. It accepts two parameters and returns null if both parameters are equal. If they are not equal, the first parameter value is returned.
What is NVL used for?
NVL lets you replace null (returned as a blank) with a string in the results of a query. If expr1 is null, then NVL returns expr2 . If expr1 is not null, then NVL returns expr1 .
Where is NVL used?
The NVL Function. In Oracle, the NVL function allows you to replace a NULL value with another value. It’s helpful when you want to store the fact that there is no data for a particular column, but you want to display something else.
What is NVL and nvl2 in SQL?
Nvl(arg1,arg2) nvl is used for converting null values. In nvl if argument 1 is null then it returns argument 2 but argument 1 is not null it returns itself. In nvl2 (arg1,arg2,arg3) in nvl2 it converts any number into according to given number with null also .
What is difference between NVL and nvl2?
What is the difference between nvl and nvl2? Answer: The nvl function only has two parameters while the nvl parameter has three arguments. The nvl2 like like combining an nvl with a decode because you can transform a value: NVL ( expr1 , expr2 ): If expr1 is null, then NVL returns expr2.
What is decode in Oracle?
DECODE compares expr to each search value one by one. If expr is equal to a search , then Oracle Database returns the corresponding result . If no match is found, then Oracle returns default . If default is omitted, then Oracle returns null.
What is NVL in database?
Unlike a lot of programming/database terms, NVL is not an acronym for anything. It’s just NVL, though it can help to think of it as Null VaLue. NVL is a substitution function; that is, it is used to display one value if another value is NULL. And not just zero, but NULL, empty, void.
What is the difference between NVL and nvl2?
How NVL function works in SQL?
How to use the NVL function in Oracle?
Description. The Oracle/PLSQL NVL function lets you substitute a value when a null value is encountered.
What are the NVL and the nvl2 functions in Oracle?
NVL (expr1,expr2) : In SQL,NVL () converts a null value to an actual value.
How to use NVL?
The NVL function. You can use the NVL function to convert an expression that evaluates to NULL to a value that you specify. The NVL function accepts two arguments: the first argument takes the name of the expression to be evaluated; the second argument specifies the value that the function returns when the first argument evaluates to NULL.
How to use NVL SQL?
NVL Function in SQL | NVL in SQL – To evaluate a specified expression and replace a non-NA value or empty string with one value and a NA value with another, use NVL2.The NVL( ) function is available in Oracle, and not in MySQL or SQL Server. This function is used to replace NULL value with another value.It is similar to the IFNULL Function in MySQL and the ISNULL Function in SQL Server.