Your example suggests that the "GW-22" is a substring of the field followed by
trailing spaces so you'll want something that searches substrings, whereas "="
will always just test on matching the entire field.
Try "like" by default, such as "where site_id like 'GW-22 %'". I added the
space between the 22 and the wildcard % so that the field containing just
'GW-22' isn't also matched.
If you need something more specific than simple substring match, you can use a
regular expression, which I think is spelled like "where site_id ~ '...'" but
check the manual to be sure about regexp syntax. But "like" will probably do
you here.
-- Darren Duncan
Rich Shepard wrote:
I run this SELECT statement on a table:
select distinct(site_id) from chemistry order by site_id;
and in the returned set I see:
GW-21
GW-22
GW-22 +
GW-24
I want to find that row returning 'GW-22 +' because I believe it
should be 'GW-23'. However, my attempts to retrieve that row keep failing.
I've tried these statements:
select count(*) from chemistry where site_id = 'GW-22 +';
count -------
0
(1 row)
yet,
select count(*) from chemistry where site_id = 'GW-22';
count -------
803
(1 row)
Looking for the blank row also fails when I try to specify site_id as is
null, = ' ', or =''.
Please point me to the proper way of finding this rogue row so I can
correct the value in the site_id column.
TIA,
Rich
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