Trouble with text search select statement

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I am having trouble getting a multiple column text search select statement
to work.

I've setup the following:

CREATE TABLE tstest (col1 text, col2 text);
INSERT INTO tstest (col1, col2) VALUES ('bird', 'moon');
CREATE INDEX tstest_ts_idx ON tstest USING gin(to_tsvector('english',
coalesce(col1, '') || '' || coalesce(col2, '')));

I then execute what I believe is the correct select statement:

SELECT * FROM tstest WHERE to_tsvector('english', coalesce(col1, '') || ''
|| coalesce(col2, '')) @[EMAIL PROTECTED]
 to_tsquery('english', 'bird');

If I remove the second column from the to_tsvector in the select statement
then it returns the row.

SELECT * FROM tstest WHERE to_tsvector('english', coalesce(col1, '')) @[EMAIL PROTECTED]
('english', 'bird');

I know I've missed something basic but I can't figure out what.

As a side note I don't understand the purpose of the || '' || between the
columns in the to_tsvector.  I saw it in several examples.  I've tried
both
with and without it with no change.

Thanks in advance.

-Mont

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I am having trouble getting a multiple column text search select statement
to work.<br><br>I&#39;ve setup the following:<br><br><span
style="font-family: courier new,monospace;">CREATE TABLE tstest (col1
text, col2 text);</span><br style="font-family: courier new,monospace;">
<span style="font-family: courier new,monospace;">INSERT INTO tstest
(col1, col2) VALUES (&#39;bird&#39;, &#39;moon&#39;);</span><br
style="font-family: courier new,monospace;"><span style="font-family:
courier new,monospace;">CREATE INDEX tstest_ts_idx ON tstest USING
gin(to_tsvector(&#39;english&#39;, coalesce(col1, &#39;&#39;) ||
&#39;&#39; || coalesce(col2, &#39;&#39;)));</span><br style="font-family:
courier new,monospace;">
<br>I then execute what I believe is the correct select
statement:<br><br><span style="font-family: courier new,monospace;">SELECT
* FROM tstest WHERE to_tsvector(&#39;english&#39;, coalesce(col1,
&#39;&#39;) || &#39;&#39; || coalesce(col2, &#39;&#39;)) @[EMAIL PROTECTED]
(&#39;english&#39;, &#39;bird&#39;);</span><br
style="font-family: courier new,monospace;">
<br>If I remove the second column from the to_tsvector in the select
statement then it returns the row.<br><br><span style="font-family:
courier new,monospace;">SELECT * FROM tstest
WHERE to_tsvector(&#39;english&#39;, coalesce(col1, &#39;&#39;)) @[EMAIL PROTECTED]
(&#39;english&#39;, &#39;bird&#39;);</span><br
style="font-family: courier new,monospace;">
<br>I know I&#39;ve missed something basic but I can&#39;t figure out
what.<br><br>As a side note I don&#39;t understand the purpose of the ||
&#39;&#39; || between the columns in the to_tsvector.&nbsp; I saw it in
several examples.&nbsp; I&#39;ve tried both with and without it with no
change.<br>
<br>Thanks in advance.<br><br>-Mont<br><br>

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