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How to concatenate strings of a string field in a PostgreSQL 'group by' query?
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PostgreSQL 9.0 or later:
Recent versions of Postgres (since late 2010) have the string_agg(expression, delimiter) function which will do exactly what the question asked for, even letting you specify the delimiter string:
SELECT company_id, string_agg(employee, ', ')
FROM mytable
GROUP BY ...
Server.UrlEncode vs. HttpUtility.UrlEncode
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answered Mar 2 '09 at 15:03
Mehrdad AfshariMehrdad Afshari
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How to find a min/max with Ruby
... so anything that includes Enumerable will have those methods available.
v2.4 introduces own Array#min and Array#max, which are way faster than Enumerable's methods because they skip calling #each.
@nicholasklick mentions another option, Enumerable#minmax, but this time returning an array of [min,...
onCreateOptionsMenu inside Fragments
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edited Jun 29 '15 at 21:17
Michael
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Sequence contains no elements?
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answered Aug 24 '09 at 19:23
Ryan LundyRyan Lundy
181k3232 gold badges170170 silver badges203203 bronze badges
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Access parent URL from iframe
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21
You're correct. Subdomains are still considered separate domains when using iframes. It's possi...
How can I efficiently select a Standard Library container in C++11?
... you need an ordered associative container
Otherwise, jump to the question 2.
Question 1.1: Ordered ?
If you do not need a specific order, use an unordered_ container, otherwise use its traditional ordered counterpart.
Question 1.2: Separate Key ?
If the key is separate from the value, use a...
How to send email to multiple recipients using python smtplib?
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320
This really works, I spent a lot of time trying multiple variants.
import smtplib
from email.m...
Measuring text width to be drawn on Canvas ( Android )
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227
Have you looked at android.graphics.Paint.measureText(String txt)?
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Number of days between two NSDates [duplicate]
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edited Nov 18 '15 at 16:25
Sam
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answered Jan 19 ...