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M_PI works with math.h but not with cmath in Visual Studio
...Time.h may be included indirectly in your project. In my case one possible order of including was the following:
project's "stdafx.h" → <afxdtctl.h> → <afxdisp.h> → <ATLComTime.h> → <math.h>
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Redefine tab as 4 spaces
...our tab character width to be different from the width of your indents, in order to reduce the chance of tab characters masquerading as proper indents. (list + expandtab can help here too) Also, 8-char-wide tabs is "the standard" -- your terminal, Python, and many other tools default to 8-char-wide-...
NOT IN vs NOT EXISTS
...ikely to be the ones you want anyway.
When neither Products.ProductID or [Order Details].ProductID allow NULLs the NOT IN will be treated identically to the following query.
SELECT ProductID,
ProductName
FROM Products p
WHERE NOT EXISTS (SELECT *
FROM [Order Details]...
SQL/mysql - Select distinct/UNIQUE but return all columns?
...ect *
from (
select *,
row_number() over (partition by field1 order by field2) as row_number
from table
) as rows
where row_number = 1
On others (MySQL, SQLite), you'll need to write subqueries that will make you join the entire table with itself (example), so not recommended.
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Difference between Document-based and Key/Value-based databases?
...plex queries, your application will have to create and maintain indexes in order to access the desired data.
Document databases support queries by key and map-reduce functions as well, but also allow you to do basic queries by value, such as "Give me all users with more than 10 posts". Document dat...
How do I edit /etc/sudoers from a script?
I need to edit /etc/sudoers from a script to add/remove stuff from white lists.
12 Answers
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capturing self strongly in this block is likely to lead to a retain cycle
...etter read from right to left. Declaring SomeType* __weak variable in this order reads more naturally from right to left as: variable is a weak pointer to SomeType.
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Absolute vs relative URLs
...ink, a relative url s used, and if it is clicked, it has to be resolved in order to follow it. In this case, the current context is
http://myhost/mypath/myresource1.html
so the schema, hostname, and leading path of these are taken and prepended to pages/page1, yielding
http://myhost/mypath/pages...
jQuery event handlers always execute in order they were bound - any way around this? [duplicate]
It can be anoying that jQuery event handlers always execute in the order they were bound. For example:
10 Answers
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Android buildscript repositories: jcenter VS mavencentral
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