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Is it a good idea to index datetime field in mysql?
...ng elimination of rows between conditions: http://dev.mysql.com/doc/refman/5.0/en/mysql-indexes.html
This makes your datetime column an excellent candidate for an index if you are going to be using it in conditions frequently in queries. If your only condition is BETWEEN NOW() AND DATE_ADD(NOW(), ...
Why would one declare a Java interface method as abstract?
.../or abstract modifier for a method declared in an interface."
For Java SE 5.0: "For compatibility with older versions of the Java platform, it is permitted but discouraged, as a matter of style, to redundantly specify the abstract modifier for methods declared in interfaces."
...
Is it better to reuse a StringBuilder in a loop?
...mpiler, which automatically creates StringBuilders (StringBuffers pre-J2SE 5.0) when it sees String concatenations, the first example in the question is equivalent to:
for (loop condition) {
String s = "some string";
. . .
s += anotherString;
. . .
passToMethod(s);
}
Which is more reada...
Append column to pandas dataframe
...
#output
dat1 dat2
1 0.0 NaN
2 NaN 4.0
3 1.0 NaN
4 NaN 5.0
5 2.0 NaN
6 NaN 6.0
7 3.0 NaN
8 NaN 7.0
#reset index
dat1 = dat1.reset_index(drop=True)
dat2 = dat2.reset_index(drop=True)
#both 2 ways to get the same result
print(dat1.join(dat2))
dat1 dat2
0 ...
Colspan all columns
...the cell is defined.
However, most browsers never implemented this.
HTML 5.0 (made a candidate recommendation back in 2012), the WhatWG HTML living standard (the dominant standard today), and the latest W3 HTML 5 spec all do not contain the wording quoted from HTML 4 above, and unanimously agree t...
How to make a phone call in android and come back to my activity when the call is done?
...
Using android 5.0 the onActivityResult method is call emmediately the call starts!!
– Panciz
Jun 8 '17 at 1:58
add...
How can I enable zoom in on UIWebView which inside the UIScrollView?
... the Attributes Inspector, set your Max and Min zoom factors (I set 0.5 to 5.0, that works well).
On the Web View, in the Attributes Inspector:
In the Web View section, select Scales Pages To Fit
In the View section, select for Mode, "Top Left"
In the View section at the bottom, check off User Inter...
Should you declare methods using overloads or optional parameters in C# 4.0?
I was watching Anders' talk about C# 4.0 and sneak preview of C# 5.0 , and it got me thinking about when optional parameters are available in C# what is going to be the recommended way to declare methods that do not need all parameters specified?
...
MySQL: Large VARCHAR vs. TEXT?
... The row length limit is 65,535 bytes [ dev.mysql.com/doc/refman/5.0/en/column-count-limit.html ]. If your column is utf8-encoded, that means a 3000-character varchar column can take up to 9000 bytes.
– Jan Fabry
Jan 7 '10 at 21:05
...
CruiseControl [.Net] vs TeamCity for continuous integration?
...ile making the complex quite painless.
Edit:
We just upgraded to TeamCity 5.0 a few weeks ago and it was another painless upgrade. It let us take advantage of the improved code coverage capabilities and GIT support. We are also now using the personal build and pre-tested commit features that have b...