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Difference between EXISTS and IN in SQL?
What is the difference between the EXISTS and IN clause in SQL?
21 Answers
21
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Changing Java Date one hour back
...lDateTime().minusHours(1)
Java 8: java.time.LocalDateTime
LocalDateTime.now().minusHours(1)
Java 8 java.time.Instant
// always in UTC if not timezone set
Instant.now().minus(1, ChronoUnit.HOURS));
// with timezone, Europe/Berlin for example
Instant.now()
.atZone(ZoneId.of("Europe/Berlin...
Best practices for catching and re-throwing .NET exceptions
...tion object's InnerException and stack trace are preserved. Is there a difference between the following code blocks in the way they handle this?
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Eclipse: Can you format code on save?
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@PéterVarga if you're using PyDev, check this
– grisaitis
Jun 29 '12 at 18:42
1
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How to empty a Heroku database
...e, if you are using SHARED_DATABASE_URL:
$ heroku pg:reset DATABASE_URL
Now to recreate the database with nothing in it:
$ heroku run rake db:migrate
To populate the database with your seed data:
$ heroku run rake db:seed
---OR---
You can combine the last two (migrate & seed) into on...
PHP Multidimensional Array Searching (Find key by specific value)
... $field, $value)
{
foreach($products as $key => $product)
{
if ( $product[$field] === $value )
return $key;
}
return false;
}
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Does Python's time.time() return the local or UTC timestamp?
... gives you timestamp. Just remove the milliseconds - str(datetime.datetime.now()).split('.')[0]
– Hussain
Jan 3 '13 at 13:25
17
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How to perform a real time search and filter on a HTML table
...l allow you to search words in any order in the row. It will work the same if you type apple green or green apple:
var $rows = $('#table tr');
$('#search').keyup(function() {
var val = '^(?=.*\\b' + $.trim($(this).val()).split(/\s+/).join('\\b)(?=.*\\b') + ').*$',
reg = RegExp(val, 'i'...
How to prepend a string to a column value in MySQL?
... the CONCAT function to do that:
UPDATE tbl SET col=CONCAT('test',col);
If you want to get cleverer and only update columns which don't already have test prepended, try
UPDATE tbl SET col=CONCAT('test',col)
WHERE col NOT LIKE 'test%';
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Remove large .pack file created by git
... a load of files in to a branch and merged and then had to remove them and now I'm left with a large .pack file that I don't know how to get rid of.
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