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How to find if div with specific id exists in jQuery?
... alert('this record already exists');
}
});
Or, the non-jQuery version for this part (since it's an ID):
$("li.friend").live('click', function(){
name = $(this).text();
if(document.getElementById(name) == null) {
$("div#chatbar").append("<div class='labels'><div id='" + name + ...
Cross-reference (named anchor) in markdown
Is there markdown syntax for the equivalent of:
10 Answers
10
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Do DOM tree elements with ids become global variables?
Working on an idea for a simple HTMLElement wrapper I stumbled upon the following for Internet Explorer and Chrome :
5 An...
How to select rows with no matching entry in another table?
... of joys, even though values from one table are being used in the style of foreign keys, there's no foreign key constraints on the tables.
...
How to select unique records by SQL
When I perform "SELECT * FROM table" I got results like below:
8 Answers
8
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IN clause and placeholders
...
A string of the form "?, ?, ..., ?" can be a dynamically created string and safely put into the original SQL query (because it is a restricted form that does not contain external data) and then the placeholders can be used as normal.
Consid...
How to get multiple counts with one SQL query?
...
Thanks for this very elegant solution. Btw, this also works with TSQL.
– Annie Lagang
Sep 9 '16 at 0:52
7
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Can I set enum start value in Java?
...
Java enums are not like C or C++ enums, which are really just labels for integers.
Java enums are implemented more like classes - and they can even have multiple attributes.
public enum Ids {
OPEN(100), CLOSE(200);
private final int id;
Ids(int id) { this.id = id; }
public i...
How can I do an UPDATE statement with JOIN in SQL Server?
...udid;
Note that the target table must not be repeated in the FROM clause for Postgres.
Oracle:
update
(select
u.assid as new_assid,
s.assid as old_assid
from ud u
inner join sale s on
u.id = s.udid) up
set up.new_assid = up.old_assid
SQLite:
update ...
Which is fastest? SELECT SQL_CALC_FOUND_ROWS FROM `table`, or SELECT COUNT(*)
...
It depends. See the MySQL Performance Blog post on this subject: To SQL_CALC_FOUND_ROWS or not to SQL_CALC_FOUND_ROWS?
Just a quick summary: Peter says that it depends on your indexes and other factors. Many of the comments to the post seem to say that...