On 12 Apr 2019, at 5:00pm, Tony Papadimitriou <to...@acm.org> wrote:

> update t set s = replace(s, 'USA', '___'),
>             s = replace(s,'US','USA'),
>             s = replace(s,'___','USA');

To add to the answers other people gave, there's no set order for SQL to 
process these changes.  The SQL definition doesn't specify that they'll be done 
in any particular order.
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