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From Michael Moore
Subject weird error message
Date
Msg-id CACpWLjMK8J2O_zjrhBgfYoYU=eO=+CNO7DE0BNM6YNTkbYV4Hw@mail.gmail.com
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SELECT COALESCE(dt, i) FROM  (SELECT  null AS dt, null AS i) q;
gives
ERROR:  failed to find conversion function from unknown to text
********** Error **********

ERROR: failed to find conversion function from unknown to text
SQL state: XX000

So, I understand the datatype of 'null' is 'unknown', but what does 'text' have to do with it?

Mike

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