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coalesce - script and chart function

The coalesce function returns the first of the parameters that has a valid non-NULL representation. Any number of parameters can be used.

Syntax:  

coalesce(expr1[ , expr2 , expr3 , ...])

Arguments:  

Arguments
Argument Description
expr1 The first expression to check for a valid non-NULL representation.
expr2 The second expression to check for a valid non-NULL representation.
expr3 The third expression to check for a valid non-NULL representation.