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    <p><a href="http://www.postgresql.org/docs/current/interactive/sql-copy.html" rel="nofollow">COPY</a> is a bit odd as it sort of treats its <code>query</code> argument as a string even though it isn't written as a string. The result is that the <code>query</code>:</p> <pre><code>SELECT * FROM retrieve_info($1, $2) </code></pre> <p>isn't executed in the context of the function, it is executed in the context of COPY itself. Even though you say:</p> <pre><code>copy (select * from t) ... </code></pre> <p>it is treated more as though you wrote:</p> <pre><code>copy 'select * from t' ... </code></pre> <p>so by the time the query is executed, the function parameters no longer have any meaning, the <code>query</code> argument to COPY may look like it would behave like a closure in other languages but it doesn't, it acts more like a string that gets passed to <code>eval</code>.</p> <p>You can get around this strangeness by using the usual Kludge of Last Resort: <a href="http://www.postgresql.org/docs/current/interactive/plpgsql-statements.html#PLPGSQL-STATEMENTS-EXECUTING-DYN" rel="nofollow">dynamic SQL</a>. You should get better results if you write your function to use string wrangling and EXECUTE:</p> <pre><code>create or replace function print_out(text, text) returns void as $$ begin execute 'copy (' || 'select * from retrieve_info' || '(' || quote_literal($1) || ',' || quote_literal($2) || ')' || ') to ''myfilepath/test.csv'' with csv header;'; end; $$ language plpgsql; </code></pre>
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    1. COThanks for your answer and explanation. The above above code fails at `with` csv. Changing it to just ...`.csv'''';` (think I've seen that somewhere) seems to work, but calling it I get the message `ERROR: function print_test(unknown, unknown) does not exist SQL state: 42883 Hint: No function matches the given name and argument types. You might need to add explicit type casts. Character: 15`
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    2. COI don't see any `print_test` anywhere. It worked for me as in my answer, did you mess up the nested quotes somewhere?
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    3. COYeah, sorry about that. They are called slightly different in the real code. I think it looks correct(?), please have a look at this [print screen](http://i1326.photobucket.com/albums/u642/Awful-Dodger/ScreenShot2013-11-14at75409PM_zps5a693e66.png)
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