How to use the nvl () function in Oracle

In view of how to use the nvl () function in Oracle, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible method.

1. Introduction:

Nvl () function

Returns a non-null value from two expressions.

Grammar

NVL (eExpression1, eExpression2)

Parameters.

EExpression1, eExpression2

If eExpression1 evaluates to null, NVL () returns eExpression2. If eExpression1 evaluates to a value other than null, eExpression1 is returned. EExpression1 and eExpression2 can be any data type. If the result of both eExpression1 and eExpression2 is a null value, NVL () returns .null.

Return value type

Character type, date type, date-time type, numerical type, monetary type, logical type or null value

Description

In cases where the null value is not supported or the null value is irrelevant, you can use NVL () to remove the null value from the calculation or operation.

Select nvl (a.nameme 'empty') as name from student a join school b on a.ID=b.ID

Note: the types of the two parameters should match

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