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The Oracle NVL() function allows you to replace null with a more meaningful alternative in the results of a query. The following shows the syntax of the NVL() function: NVL(e1, e2) Code language: SQL (Structured Query Language) ( sql )
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. The arguments expr1 and expr2 can have any data type.
The Oracle/PLSQL NVL function lets you substitute a value when a null value is encountered. Syntax. The syntax for the NVL function in Oracle/PLSQL is: NVL( string1, replace_with ) Parameters or Arguments. string1. The string to test for a null value. replace_with. The value returned if string1 is null. Returns.
10 lut 2023 · Funkcja NVL (ang. Null Value) w języku SQL Oracle służy do zamiany wartości NULL na inne określone przez użytkownika. Składnia funkcji NVL wygląda następująco: NVL(wartość_porównywana, wartość_zamieniana) Przykład: SELECT NVL(NULL, 'brak danych') FROM dual; Wynik:
SQL> NVL. The NVL function allows you to replace null values with a default value. If the value in the first parameter is null, the function returns the value in the second parameter. If the first parameter is any value other than null, it is returned unchanged.
9 lis 2015 · NVL and COALESCE are used to achieve the same functionality of providing a default value in case the column returns a NULL. The differences are: NVL accepts only 2 arguments whereas COALESCE can take multiplearguments. NVL evaluates both the arguments and COALESCE stops at firstoccurrence of a non-Null value.
The Oracle NVL2() function is an extension of the NVL() function with different options based on whether a NULL value exists. The Oracle NVL2() function accepts three arguments. If the first argument is not null, then it returns the second argument.
