Question
kavin kumar · Aug 21, 2017

Data and selection expression

Explain data expression and selection expression?

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Discussion (4)3
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Sorry, what's the context? SQL ? COS ?

Please give us more context. Where is the question arising from? It looks a bit like a homework assignment after a class covering a specific area of the COS language.

online docs don't give a direct hint.

so my shot from the hip: 
selection expression - $select(), $case()  where you get a value based  on a condition
data expression - anything that sets, modifies, composes data.

this is  a quite academic view since  data expressions may contain selection expressions
and selection expressions may contain data expressions.
both variants and any mix of it  are quite common in COS 

HTH