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Is there a way to compare two dates in the same table like this:
SELECT * FROM mytable WHERE date_1 = date_2;
I am looking for the simplest approach to do this as part of an update statement.
Yes, you can do that. Simple as that.
Have a look at the
date/timedata types in PostgreSQL.You may have to pay special attention if your “date”, in fact, is a
timestamp. By default up to 6 fractional digits are saved, can be tricky with the equality operator. You might cast totimestamp(0)to round to seconds or usedate_trunc()to truncate to one of various time units.