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Learn how to use the Oracle NVL() function to replace null values with alternative values in SQL queries. See syntax, rules, examples, and comparison with CASE and COALESCE functions.
NVL lets you replace null with a string in the results of a query. Learn the syntax, purpose, examples, and implicit conversion of NVL and related functions.
Learn how to use the SQL NVL() function to return an alternative value when an expression is NULL. See examples for MySQL, SQL Server, MS Access and Oracle databases.
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 . If arg 1 that's given number is null then it returns arg3 And on the other hand if it ...
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. A final example using the NVL function in Oracle/PLSQL is: SELECT NVL(commission, 0) FROM sales;
Learn how to use the NVL and NVL2 functions to replace null values with meaningful values in Oracle databases. See examples with the ProductCatalogue table and the syntax of the functions.
5. How NVL Works. The NVL function checks the value of expression1. If it is NULL, NVL returns the value of replace_with_value. Otherwise, it returns the value of expression1. Returning Non-NULL Values. The beauty of NVL lies in its simplicity. When faced with a potential NULL value, NVL will ensure that a non-NULL value gets returned:
Learn how to use the NVL() function in SQL to replace NULL values with other values. See the syntax and examples for different DBMSs that support NVL() or its synonyms.
Learn how to use the NVL function in Oracle to replace NULL, empty or NA values with meaningful values. See the syntax, examples and situations where NVL function is necessary.
NVL is an advanced function that the Oracle database supports. It is used to substitute a value, when a NULL value is encountered. The NVL function is supported in the various versions of the Oracle/PLSQL, including, Oracle 12c, Oracle 11g, Oracle 10g, Oracle 9i and Oracle 8i.