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About nvl functions in Oracle databases

Source: Internet
Author: User
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When we used to display the database query results on the page, we always had to judge the null field. If it was null, it would display "". Suddenly we found this method stupid, in addition, "null" appears on the page ".

When using the Oracle database, I found that the nvl function is very useful, so I sorted it out.

Nvl () function
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 ..

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