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" <>
Date: Wednesday, March 7, 2018 at 11:23 AM
To: Martin Mueller <>
Cc: "" <>
Subject: Re: a very primitive question about division

On Wed, Mar 7, 2018 at 10:21 AM, Martin Mueller 
<<>> 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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