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What are bitwise shift (bit-shift) operators and how do they work?
... operators can be applied to integer values (int, long, possibly short and byte or char). In some languages, applying the shift operators to any datatype smaller than int automatically resizes the operand to be an int.
Note that <<< is not an operator, because it would be redundant.
Also n...
Is there a reason that we cannot iterate on “reverse Range” in ruby?
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A range is just that: something defined by its start and end, not by its contents. "Iterating" over a range doesn't really make sense in a general case. Consider, for example, how you would "iterate" over the range produced by two dates. Would you iterate by day? b...
When should I use a composite index?
...ly benefit queries that query on both dimensions or the leftmost dimension by itself, but not the rightmost dimension by itself. If you're always querying two dimensions, a composite index is the way to go, doesn't really matter which is first (most probably).
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PHP 5.4 Call-time pass-by-reference - Easy fix available?
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You should be denoting the call by reference in the function definition, not the actual call. Since PHP started showing the deprecation errors in version 5.3, I would say it would be a good idea to rewrite the code.
From the documentation:
There is n...
Sort Go map values by keys
When iterating through the returned map in the code, returned by the topic function, the keys are not appearing in order.
6...
How to find largest objects in a SQL Server database?
...d I go about finding the largest objects in a SQL Server database? First, by determining which tables (and related indices) are the largest and then determining which rows in a particular table are largest (we're storing binary data in BLOBs)?
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What does do?
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To attempt to understand what each means, here are definitions provided by Microsoft:
Internet Explorer supports a number of document compatibility modes that enable different features and can affect the way content is displayed:
Edge mode tells Internet Explorer to display content i...
Should a “static final Logger” be declared in UPPER-CASE?
... static final references are constants if they are immutable. by this logic, you would never have constant strings because any static final string is a reference.
– Jeffrey Blattman
Jan 25 '13 at 4:04
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GROUP BY to combine/concat a column [duplicate]
...XML PATH (''))
, 1, 1, '') AS URLList
FROM TableName AS a
GROUP BY [User], Activity
SQLFiddle Demo
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【解决】VNC:No configured security type is supported by 3.3 viewer - ...
【解决】VNC:No configured security type is supported by 3.3 viewerno-configured-security-type-is-supported-by-3.3-vnc-viewer远端机器安装了RealVNC的服务端后，客户端机器连接报错：No configured security type is supported by 3 3 viewer。解决方法：1、远端机器RealVNC...