what are variable ports and list two situations when they
can be used?

Answer Posted / pooja ahmed

variable ports can be created in many trans.... the value
of the values will be used only with in that trans...

porpuse: to store the values n to perfoorm cal

for ex: in exp we take variable port to cal the
caluation.like sal+comm
or decode( partcost< 100,y,s)

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