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2012-11-16T23:40:53.717
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This is pretty straight forward if you wanted to use a composite type, such as the native Point type, in your array. Something like this: <pre><code>select dt.id, array_agg(point(p.x, p.y)) from pointtable p join ( select id, unnest(points) as p from linetable ) as dt on p.id = dt.p group by dt.id order by dt.id; </code></pre> would give you this sort of output: <pre><code> id | array_agg ----+------------------------------------------- 1 | {"(1,0)","(2,1)","(5,6)","(7,0)","(2,4)"} 2 | {"(2,4)","(4,4)","(7,0)","(5,6)","(2,1)"} 3 | {"(1,0)","(5,9)"} </code></pre> Then you could work with the points. If you really want a two dimensional array then you can <a href="http://www.postgresql.org/docs/current/static/sql-createaggregate.html" rel="nofollow">create your own aggregate function</a>: <pre><code>create aggregate array_cat_agg(int[]) (sfunc = array_cat, stype = int[], initcond = '{}'); </code></pre> and then: <pre><code>select dt.id, array_cat_agg(array[[p.x, p.y]]) from pointtable p join ( select id, unnest(points) as p from linetable ) as dt on p.id = dt.p group by dt.id order by dt.id; </code></pre> to get this: <pre><code> id | array_cat_agg ----+--------------------------------- 1 | {{1,0},{2,1},{5,6},{7,0},{2,4}} 2 | {{2,1},{5,6},{7,0},{2,4},{4,4}} 3 | {{1,0},{5,9}} </code></pre> Note the <code>array[[...]]</code> trickery, you need that to make sure you get the right version of <code>array_cat</code>, if you just <code>array[...]</code> then you'll end up with a flattened array and that will make you sad. You can't just use <a href="http://www.postgresql.org/docs/current/static/functions-aggregate.html#FUNCTIONS-AGGREGATE-TABLE" rel="nofollow"><code>array_agg</code></a> here as there's no such thing as an array-of-arrays and <code>array_agg(array[p.x, p.y])</code> wants to create an array-of-arrays. Hence the custom aggregate.
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1. POConverting id's in int[] elements in another table Postgres
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1. COHey Thanks. I was able to apply that to my database. I appreciate the help.
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