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You get in touch with a Perform process by using the process name, accompanied by the argument listing in parentheses, in an expression. You may omit the parentheses only if you aren't giving any arguments. Having said that, your read more code is a lot more readable if You usually incorporate the parentheses.
From doc: Executes the question, and returns the first column of the primary row in The end result established returned because of the query. Extra columns or rows are dismissed.}