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How do I make a textbox that only accepts numbers?
...g the KeyPress event and just removing characters which didn't fit the specification. I've looked at the MaskedTextBox control but I'd like a more general solution that could work with perhaps a regular expression, or depend on the values of other controls.
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How to count occurrences of a column value efficiently in SQL?
...his should work:
SELECT age, count(age)
FROM Students
GROUP by age
If you need the id as well you could include the above as a sub query like so:
SELECT S.id, S.age, C.cnt
FROM Students S
INNER JOIN (SELECT age, count(age) as cnt
FROM Students
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How to see full symlink path
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readlink -f symlinkName
The above should do the trick.
Alternatively, if you don't have either of the above installed, you can do the following if you have python 2.6 (or later) installed
python -c 'import os.path; print(os.path.realpath("symlinkName"))'
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How to get last inserted row ID from WordPress database?
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"This function returns false if the row could not be inserted. Otherwise, it returns the number of affected rows (which will always be 1)." From: codex.wordpress.org/Function_Reference/wpdb_Class#INSERT_rows
– unbreak
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CSRF protection with CORS Origin header vs. CSRF token
...h XHR (see e.g. Security for cross-origin resource sharing), at least not, if we trust the W3C spec to be implemented correctly in all modern browsers (can we?)
At the end of the day you have to "trust" the client browser to safely store user's data and protect the client-side of the session. If yo...
In Maven 2, how do I know from which dependency comes a transitive dependency?
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If you use eclipse and the m2eclipse plugin then there is a graphical version of dependency tree where you can filter by scope etc.
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TypeError: got multiple values for argument
... with this error and it seems that my problem has an interesting distinct difference than all the posts I read so far, namely, all the other posts so far have the error in regards to either a user created class or a builtin system resource. I am experiencing this problem when calling a function, I c...
How to create json by JavaScript for loop?
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So, dumb question, I know the difference between an array of objects and an object that contains an array of objects (pretty much, the difference between jsonArr = [] and jsonObj = {} in this post). I have, maybe too often, and perhaps even erroneously, re...
How can I convert a string to a number in Perl?
...ope [rabdelaz@Linux_Desktop:~/workspace/akatest_5]$perl -e 'print "nope\n" if "1,000" > 10;'
– Ramy
May 22 '14 at 15:24
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How can I get System variable value in Java?
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To clarify, system variables are the same as environment variables. User environment variables are set per user and are different whenever a different user logs in. System wide environment variables are the same no matter what user ...