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19 sie 2010 · coalesce is supported in both Oracle and SQL Server and serves essentially the same function as nvl and isnull. (There are some important differences, coalesce can take an arbitrary number of arguments, and returns the first non-null one.
The SQL Server ISNULL() function lets you return an alternative value when an expression is NULL: SELECT ProductName, UnitPrice * (UnitsInStock + ISNULL(UnitsOnOrder, 0)) FROM Products;
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. We know that COL1 in the test table contains null in all rows except the first.
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 )
In this tutorial, you will learn how to use the Oracle IS NULL and IS NOT NULL operators to check if a value in a column or an expression is NULL or not.
This tutorial shows you how to use the Oracle NVL2() function to substitute a null value with different options.
31 gru 2009 · Use: IF Var IS NULL THEN var := 5; END IF; Oracle 9i+: var := COALESCE (Var, 5) Other alternatives: var := NVL (var, 5)
