In this example, the NVL2() function checks if the first name is not null, then it returns the full name of the sales employee assigned to the sales order. Otherwise, it returns a literal string Not assigned. D) Oracle NVL2() function with expression example First, the following statement...
Another example using the NVL2 function in Oracle/PLSQL is: select supplier_id, NVL2(supplier_desc, supplier_name, supplier_name2) from suppliers; This SQL statement would return thesupplier_name2field if thesupplier_desccontained a null value. Otherwise, it would return thesupplier_namefield....
oracle中null值问题以及滤空函数(nvl) 1、select语句中的null问题: (1)包含null的表示式都为null (2)null永远不等于null2、oracle的滤空函数(通用函数):nvl(a,b):表示a不为null返回nvl,a为null返回bnvl23、oracle中判空 用is关键字:select*fromemp where comm = null;(错误)select*fromemp ...
If the data types ofexpr2andexpr3are different, OceanBase Database implicitly converts one to the other. If their data types cannot be implicitly converted, the database returns an error. Ifexpr2is of a character or numeric data type, the implicit conversion is implemented in the following w...
parameter if the first parameter is not NULL. Otherwise, it returns the value of the third parameter. It extends the functionality of the NVL function discussed in the previous article. Let’s see how it works. In the example below, we can see that NULL is provided as the first...