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How does MySQL process ORDER BY and LIMIT in a query?
...0. A database will also process anything in the WHERE clause before ORDER BY.
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Group by month and year in MySQL
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GROUP BY YEAR(t.summaryDateTime), MONTH(t.summaryDateTime) DESC;
is what you want.
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Should we pass a shared_ptr by reference or by value?
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This question has been discussed and answered by Scott, Andrei and Herb during Ask Us Anything session at C++ and Beyond 2011. Watch from 4:34 on shared_ptr performance and correctness.
Shortly, there is no reason to pass by value, unless the goal is to share ownership ...
Multiple working directories with Git?
I'm not sure if this is something supported by Git, but in theory it seems like it should work to me.
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Include headers when using SELECT INTO OUTFILE?
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But it will not work if there is an ORDER BY in the SELECT clause. The header line can be anywhere in the generated file depending on the order.
– COil
May 19 '14 at 14:29
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must appear in the GROUP BY clause or be used in an aggregate function
... problem. Before SQL3 (1999), the selected fields must appear in the GROUP BY clause[*].
To workaround this issue, you must calculate the aggregate in a sub-query and then join it with itself to get the additional columns you'd need to show:
SELECT m.cname, m.wmname, t.mx
FROM (
SELECT cname,...
Good ways to sort a queryset? - Django
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What about
import operator
auths = Author.objects.order_by('-score')[:30]
ordered = sorted(auths, key=operator.attrgetter('last_name'))
In Django 1.4 and newer you can order by providing multiple fields.
Reference: https://docs.djangoproject.com/en/dev/ref/models/querysets/#orde...
What is the Sign Off feature in Git for?
...er an appropriate open-source license, or that it has been provided to you by someone else under those terms. This can help establish a chain of people who take responsibility for the copyright status of the code in question, to help ensure that copyrighted code not released under an appropriate fre...
Are there any downsides to passing structs by value in C, rather than passing a pointer?
Are there any downsides to passing structs by value in C, rather than passing a pointer?
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Passing an array by reference
How does passing a statically allocated array by reference work?
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