Oracle function:
NVL (arg, value) representative if the front of the value of arg is null then the return value is the value behind the;
NVL (arg, value)=0 this represent?

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NVL (arg, value) to calculate a value of 0,
1, arg value is 0
2, arg value is null, the value to 0

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NVL (arg, value)=0 this represent?


Is the statement, before and after the two expressions, are equal;

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Returns a Boolean value, depending on NVL (arg, value) of the value

CodePudding user response:

NVL (arg, value) to calculate a value of 0,
1, arg value is 0
2, arg value is null, the value to 0

CodePudding user response:

A outlining when arg is not empty, whether arg is 0; When arg is empty, whether the value is 0

CodePudding user response:

NVL (arg, value)=0
This is a statement, which is used to determine if arg values to 0; Or is empty, if the value is defined as 0, also said whether arg is empty, the other is not established

CodePudding user response:

(1) the NVL (arg, 0), said: arg field is empty, all the empty assignment 0
(2) the NVL (arg, 0)=0 if placed in the where statement,
Said judgment field first, then assign fields blank value of 0, after=0, take this as the condition is that as long as is empty,

CodePudding user response:

Arg is 0, or arg is empty value is 0