Full Answer
What is nvl2 function in PL/SQL?
Function nvl2 in PL/SQL extends the functionality of nvl function provided by Oracle. 2. Function nvl2 basically decides the value to be returned from the query based on the null and not null value. 3.
How many arguments does the Oracle nvl2 () function accept?
The Oracle NVL2 () function accepts three arguments. If the first argument is not null, then it returns the second argument. In case the second argument is null, then it returns the third argument.
Can we use string in nvl2?
The Oracle NVL function can use string, date, and number values, for both the check_value and replace_value. However, they both need to be the same type. If a string is used for the check_value, a string also needs to be used for the replace_value. Oracle NVL2 Function Syntax and Parameters
What is the difference between NVL and nvl2?
NVL2 allows you to specify a value to check, and then specify a value to use if it is null, as well as a value to use if it is not null. It’s similar to NVL because NVL allows you to check a value and return something else if it is null.
What does NVL2 do in Oracle?
NVL2 lets you determine the value returned by a query based on whether a specified expression is null or not null. If expr1 is not null, then NVL2 returns expr2 . If expr1 is null, then NVL2 returns expr3 .
What is the difference between NVL and NVL2 in Oracle?
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 the difference between NVL and NVL2 and coalesce?
NVL : Converts null value to an actual value. NVL2 : If first expression is not null, return second expression. If first expression is null, return third expression. the first expression can have any data type.
Can NVL2 return null?
NVL2 returns one value when the value of a specified expression is not null, or another value when the value of the specified expression is null. To replace a null value with a string, use NVL .
What is difference between NVL NVL2 and NULL if?
NVL : Converts null value to an actual value. NVL2 : If first expression is not null, return second expression. If first expression is null, return third expression. the first expression can have any data type.
What is difference between Case and decode in Oracle?
From performance perspective, In Oracle decode and CASE does not make any difference. But in Exadata , Decode is faster than CASE. The Decode operation is done at storage Server level where the data is present BUT CASE is done at DB Instance level which receives data from DB storage Level.
Is coalesce the same as NVL?
NVL() The COALESCE() function is a part of SQL ANSI-92 standard while NVL() function is Oracle specific. Both statements return the same result which is one. However, the COALESCE() function only evaluates the first expression to determine the result while the NVL() function evaluates both expressions.
How does NVL work in Oracle?
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 .
Can we use NVL in decode?
The DECODE function is not specifically for handling null values, but it can be used in a similar way to the NVL function, as shown by the following example.
Can NVL take 3 arguments?
Oracle NVL2() overview The Oracle NVL2() function accepts three arguments. If the first argument is not null, then it returns the second argument. In case the second argument is null, then it returns the third argument.
What is NVL?
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 coalesce in Oracle?
COALESCE returns the first non-null expr in the expression list. At least one expr must not be the literal NULL . If all occurrences of expr evaluate to null, then the function returns null. Oracle Database uses short-circuit evaluation.
How does NVL work in Oracle?
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 .
What means NVL?
NVL. No Visible Lesion (pathology) NVL. Not Very Likely.
Which function returns the first not null expression in the Nulkf coalesce NVL2 NVL?
NVL2(expr1, expr2, expr3) : The NVL2 function examines the first expression. If the first expression is not null, then the NVL2 function returns the second expression.
What is NVL?
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 NVL2 in Oracle?
The Oracle/PLSQL NVL2 function extends the functionality found in the NVL function. It lets you substitutes a value when a null value is encountered as well as when a non-null value is encountered.
What is NVL2 function?
The NVL2 function returns a substitute value.
What does n/a return in SQL?
The SQL statement above would return 'n/a' if the supplier_city field contained a null value. Otherwise, it would return the 'Completed'.
What is NVL2 in Oracle?
In Oracle Database, the NVL2 () function allows us to replace null values with another value.
What does NVL2 return?
If expr1 is not null, then NVL2 returns expr2. If expr1 is null, then NVL2 returns expr3.
What happens if the second or third argument is null?
If the second or third argument is null, then you could end up with a null result.
What does NVL2 do?
NVL2 lets you determine the value returned by a query based on whether a specified expression is null or not null. If expr1 is not null, then NVL2 returns expr2. If expr1 is null, then NVL2 returns expr3.
Can expr1 have any data type?
The argument expr1 can have any data type. The arguments expr2 and expr3 can have any data types except LONG. If the data types of expr2 and expr3 are different, then Oracle Database implicitly converts one to the other. If they cannot be converted implicitly, then the database returns an error.
