如何获得累计和条件

Question

Here is desire output :

I want to cum_sum the STEPID value (0-99). BUT, there are two pattern as can see from pic above.

Set LEFT : will multiply*1000 when STEPID is 14. And will continue with cum_sum until STEPID is 99.
Set RIGHT : normal cumulative sum until STEPID 99.

Fiddle : http://sqlfiddle.com/#!6/06e4c/1

Answer 1

If this is a SQL question then you can use a CASE syntax in your Query. Here is an example of the method:

Select Sum(Case when X < Y Then A when X=Y then B Else C end) From Table

This allows you to add up the values only when you think that they apply. You can also so math in the output as well.

Select Sum(Case when X <= Y Then A Else B*1000 end) From Table

See: https://msdn.microsoft.com/en-us/library/ms181765.aspx