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functions similar to SQL Server IsNull functions in Oracle

Source: Internet
Author: User
Tags sql server isnull
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As a result of project requirements, SQL Server must be converted to Oracle, some SQL Server views using the IsNull function, the following several Oracle functions and IsNull have a similar effect:

NVL (EXPR1,EXPR2) If EXPR1 is null, returns the value of EXPR2, otherwise returns the value of EXPR1


NVL2 (EXPR1,EXPR2,EXPR3) If EXPR1 is null, returns the value of EXPR2, otherwise returns the value of EXPR3

Nullif (EXPR1,EXPR2) returns null if EXPR1 and EXPR2 values are equal, otherwise EXPR1 values are returned

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