Thanks.  So  round(before1550/colfreq::numeric, 2)  produces the desired result.

The explanations and examples of string functions in the Postgres documentation 
are a model of clarity. The explanations and examples of basic arithmetic 
operations  are not.  There is room for improvement there.

From: "David G. Johnston" <[email protected]>
Date: Wednesday, March 7, 2018 at 11:23 AM
To: Martin Mueller <[email protected]>
Cc: "[email protected]" <[email protected]>
Subject: Re: a very primitive question about division

On Wed, Mar 7, 2018 at 10:21 AM, Martin Mueller 
<[email protected]<mailto:[email protected]>> wrote:
Given two values defined as integers, how do I divide one by the other and get 
an answer with two decimals, e.g 3 /4 = 0.75.

​Case one of them to numeric.

​select 3/4::numeric
​
​David J.​

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