On Mon, Oct 12, 2015 at 10:58 AM, Israel Brewster <israel@xxxxxxxxxxxxxx> wrote:
Is there any way to do a pattern match against the elements of an array in postgresql (9.4 if the version makes a difference)? I have a grouped query that, among other things, returns an array of values, like:
SELECT lognum, array_agg(flightnum) as flightnums FROM logs GROUP BY lognum;
Where the flightnum field is a varchar containing either a text string or a three-or-four digit number. Now say I want to select all logs that have a flight number starting with an '8' (so '800' or '8000' series flights). My first thought was to do something like this:
SELECT * FROM (SELECT lognum,array_agg(flightnum) as flightnums FROM logs GROUP BY lognum) s1 WHERE '8%' like ANY(flightnums);
But while this doesn't give an error, it also doesn't return any results. I'm guessing that this is because the wildcard is on the left of the operator, and needs to be on the right. Of course, turning it around to be:
WHERE ANY(flightnum) like '8%'
gives me a syntax error. So is there any way I can run this query such that I get any rows containing a flight number that starts with an 8 (or whatever)?
Are you looking for this ?
SELECT lognum array_agg(flightnum) FROM logs WHERE flightnum ~ '^8' GROUP BY lognum;
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Israel Brewster
Systems Analyst II
Ravn Alaska
5245 Airport Industrial Rd
Fairbanks, AK 99709
(907) 450-7293
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