Correct Oracle Nvl function usage

The following articles mainly introduce Oracle Nvl functions. This article mainly introduces the actual application syntax and actual application parameters. The following describes the specific content, I hope it will be helpful for your future study after you browse.

Nvl () function

Returns a non-null value from two expressions.

Syntax

 
 

  
  
NVL(eExpression1, eExpression2) 
 
 

Parameters

 
 

  
  
eExpression1, eExpression2 
 
 

If the calculation result of eExpression1 is null, NVL () returns eExpression2. If the calculation result of eExpression1 is not null, eExpression1 is returned. EExpression1 and eExpression2 can be any data type. If both eExpression1 and eExpression2 are null values, NVL () returns. NULL ..

Return Value Type

Numeric, currency, logical, or null

Description

If null or null values are not supported, you can use NVL () to remove null values in the calculation or operation.

 
 

  
  
Select nvl (a. name, 'blank ') as name from student a join school B on a. ID = B. ID
 
 

Note: The two parameters must be of the same type.

The above content is a description of the Oracle Nvl function, hoping to help you in this regard.