How to use the decode function to judge the situation that is greater than or equal to

Editor to share with you how to use the decode function to judge the situation that is greater than or equal to. I hope you will get something after reading this article. Let's discuss it together.

The decode function replaces the results of the query, and decode actually functions like an if statement.

Decode (var,var1,value1,var2,value2,var3,value3) is equivalent to if var=var1 then... else if var=var2 then... else var=var3 then...

But it is only equal to the situation, if it is judged to be greater than less than the case, such as if a > b, only using decode can not be achieved, you need to add the sign () function.

The function of the sign function is very simple: sign (var). If var > 0, 1 is returned. If varb is the case, rewrite as follows:

Decode (sign (a murb),-1)

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