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What is an index in SQL?
...e file the value is stored.
In MySQL you can use EXPLAIN in front of your SELECT statement to see if your query will make use of any index. This is a good start for troubleshooting performance problems. Read more here:
http://dev.mysql.com/doc/refman/5.0/en/explain.html
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jQuery date/time picker [closed]
...ase supports TIME ZONES (find THAT in any other picker!) as well as jQuery selectors/chaining, easy-removal (avoid memory leaks!) and many other improvements. Please give it a ride, and if you have any problems or suggestions, let me know via the comment page on my website.
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How to get an element by its href in jquery?
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Yes, you can use jQuery's attribute selector for that.
var linksToGoogle = $('a[href="http://google.com"]');
Alternatively, if your interest is rather links starting with a certain URL, use the attribute-starts-with selector:
var allLinksToGoogle = $('a[hre...
How to use mysql JOIN without ON condition?
...oins-mysql-database/
You can use 'USING' instead of 'ON' as in the query
SELECT * FROM table1 LEFT JOIN table2 USING (id);
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How do I insert a linebreak where the cursor is without entering into insert mode in Vim?
... the carriage returns are added.
Check :help map-which-keys for advice on selecting unused keystrokes to map.
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Programmatically add custom event in the iPhone Calendar
...meWorks group in the Groups and Files Navigator on the left of the window. Select 'Add' then 'Existing FrameWorks' then 'EventKit.Framework'.
Then you should be able to add events with code like this:
#import "EventTestViewController.h"
#import <EventKit/EventKit.h>
@implementation EventTe...
mysql command for showing current configuration variables
...ent global setting for the innodb_log_buffer_size in bytes and megabytes:
SELECT
variable_name,
variable_value AS innodb_log_buffer_size_bytes,
ROUND(variable_value / (1024*1024)) AS innodb_log_buffer_size_mb
FROM information_schema.global_variables
WHERE variable_name LIKE 'innodb_log_buffe...
What is the difference between lemmatization vs stemming?
...meeting again tomorrow". Unlike stemming,
lemmatisation can in principle select the appropriate lemma
depending on the context.
Source: https://en.wikipedia.org/wiki/Lemmatisation
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What does it mean when MySQL is in the state “Sending data”?
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In this state:
The thread is reading and processing rows for a
SELECT statement, and sending data to the client.
Because operations occurring during this this state tend to perform
large amounts of disk access (reads).
That's why it takes more time to complete and so is the lon...
How do I find the install time and date of Windows?
... dtmInstallDate As DateTime
Dim oSearcher As New ManagementObjectSearcher("SELECT * FROM Win32_OperatingSystem")
For Each oMgmtObj As ManagementObject In oSearcher.Get
dtmInstallDate =
ManagementDateTimeConverter.ToDateTime(CStr(oMgmtO bj("InstallDate")))
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In Autoit (a Windows scri...