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ALTER TABLE without locking the table?
...f the statement. If it's a big table, INSERT or UPDATE statements could be blocked for a looooong time. Is there a way to do a "hot alter", like adding a column in such a way that the table is still updatable throughout the process?
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How to enable Bootstrap tooltip on disabled button?
...er has display:inline then the tooltip doesn't seem to work. Using display:block and display:inline-block seem to work fine. It also appears to work fine with a floated wrapper.
UPDATE Here's an updated JSFiddle that works with the latest Bootstrap (3.3.6). Thanks to @JohnLehmann for suggesting poi...
What is self-documenting code and can it replace well documented code? [closed]
...ts of the code that are not self-documenting AND
writes a comment for each block of code that explains the intent, or what the code does on a higher abstraction level (i.e. find all files larger than 10 MB instead of loop through all files in a directory, test if file size is larger than 10 MB, yiel...
A good solution for await in try/catch/finally?
I need to call an async method in a catch block before throwing again the exception (with its stack trace) like this :
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Example for boost shared_mutex (multiple reads/one write)?
... @raaj you can get the upgrade_lock, but upgrading to a unique lock will block until the shared_lock is released
– 1800 INFORMATION
Apr 10 '16 at 21:27
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Is a DIV inside a TD a bad idea?
...the XHTML DTD I discovered that a <TD>-element is allowed to contain block elements like headings, lists and also <DIV>-elements. Thus, using a <DIV>-element inside a <TD>-element does not violate the XHTML standard. I'm pretty sure that other modern variations of HTML have a...
Convert MySql DateTime stamp into JavaScript's Date format
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#MySQL
select date_format(my_date_column,'%Y-%m-%dT%T') from my_table;
#PHP
$php_date_str = substr($mysql_date_str,0,10).'T'.substr($mysql_date_str,11,8);
//JavaScript
js_date_str = mysql_date_str.substr(0,10)+'T'+mysql_date_str.substr(11,8);
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MySQL “WITH” clause
... a feature request for MySQL since January 2006: http://bugs.mysql.com/bug.php?id=16244
Other RDBMS products that support common table expressions:
Oracle 9i release 2 and later:
http://www.oracle-base.com/articles/misc/with-clause.php
Microsoft SQL Server 2005 and later:
http://msdn.microsoft.com/...
What is the default access specifier in Java?
...es are named classes declared inside a method, constructor, or initializer block. They are scoped to the {..} block in which they are declared and do not permit any access specifier. (JLS §14.3) Using reflection, you can instantiate local classes from elsewhere, and they are package-private, althou...
How does BLAS get such extreme performance?
...ng a naive traversal of each row/column of the input matrices. You can use blocking to perform as much work as possible on a smaller block of the matrix, which fits in the CPU cache, before moving on to the next block.
For purely numerical tasks, Fortran is pretty much unbeatable, and C++ takes a lo...