Web Reference: SQL COALESCE (), IFNULL (), ISNULL (), and NVL () Functions Operations involving NULL values can sometimes lead to unexpected results. SQL has some built-in functions to handle NULL values, and the most common functions are: COALESCE() - The preferred standard. (Works in MySQL, SQL Server and Oracle) IFNULL() - (MySQL) ISNULL() - (SQL Server) 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: 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. The two arguments e1 and... Part 1: SQL Null Function NVL learn the concepts of NVL null function in this tutorial with examples and all the Interview concepts covered ...
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