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Should I index a bit field in SQL Server?
...x can be loaded and unloaded from memory depending on usage.
When you ask for a set of rows, SQL uses the index to find the rows more quickly than table scanning (looking at every row).
SQL has clustered and non-clustered indexes. My understanding of clustered indexes is that they group similar i...
How to loop through a HashMap in JSP?
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Just the same way as you would do in normal Java code.
for (Map.Entry<String, String> entry : countries.entrySet()) {
String key = entry.getKey();
String value = entry.getValue();
// ...
}
However, scriptlets (raw Java code in JSP files, those <% %> thin...
Find document with array that contains a specific value
...ou have multiple query values and the document needs to match one of them. For the reverse (which is what this question is about), JohnnyHK's answer is correct. I was going to downvote but I guess this answer may be helpful to other people who end up on this page.
– MalcolmOcea...
What's the difference between using INDEX vs KEY in MySQL?
I know how to use INDEX as in the following code. And I know how to use foreign key and primary key .
5 Answers
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Mean per group in a data.frame [duplicate]
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This type of operation is exactly what aggregate was designed for:
d <- read.table(text=
'Name Month Rate1 Rate2
Aira 1 12 23
Aira 2 18 73
Aira 3 19 45
Ben 1 53 19
Ben 2 22 87
Ben ...
DefaultInlineConstraintResolver Error in WebAPI 2
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You'd think they'd trim() these after splitting and before doing a comparison... Not trimming strings used as keys is a major pet peeve of mine going all the way back to my FoxPro days.
– DVK
Jul 25 '18 at 17:47
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How do I test a private function or a class that has private methods, fields or inner classes?
...e and readable. No design compromises, no overexposing methods and fields for the sake of tests.
If you have somewhat of a legacy Java application, and you're not allowed to change the visibility of your methods, the best way to test private methods is to use reflection.
Internally we're using ...
Why does Math.round(0.49999999999999994) return 1?
...ou can see that each value slightly less than .5 is rounded down, except for 0.5 .
5 Answers
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How to “inverse match” with regex?
... way to "inverse" a regular expression match. Regexps aren't really set up for doing negative matching, they leave that to whatever language you are using them with.
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Set cURL to use local virtual hosts
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Actually, curl has an option explicitly for this: --resolve
Instead of curl -H 'Host: yada.com' http://127.0.0.1/something
use curl --resolve 'yada.com:80:127.0.0.1' http://yada.com/something
What's the difference, you ask?
Among others, this works with HTTPS. ...