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How to insert a line break in a SQL Server VARCHAR/NVARCHAR string
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This is non-deterministic. A table is defined as an unordered set of records. There is no guarantee that the database engine will return the records in the order inserted. Without a second column to preserve the order in some way (a simple IDENTITY() would work) and an ORDER BY ...
NOT IN vs NOT EXISTS
...ikely to be the ones you want anyway.
When neither Products.ProductID or [Order Details].ProductID allow NULLs the NOT IN will be treated identically to the following query.
SELECT ProductID,
ProductName
FROM Products p
WHERE NOT EXISTS (SELECT *
FROM [Order Details]...
Page redirect after certain time PHP
...ect you to wherever.php in 5 seconds
Remember that header() must be called before any actual output is sent, either by normal HTML tags, blank lines in a file, or from PHP. It is a very common error to read code with include, or require, functions, or another file access function, and have spa...
How can I upload files asynchronously?
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It's FormData who does all the magic here. Be sure to check these docs — it covers all your question about multiple files and fields.
– BorisOkunskiy
Sep 12 '13 at 13:26
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Why do some scripts omit the closing PHP tag, '?>'? [duplicate]
...other characters at the end of file. For example any char which is accidentally added behind the closing tag would trigger an error when trying to modify header info later.
Removing the closing tag is kind of "good practice" referring to many coding guidelines.
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How to prevent caching of my Javascript file? [duplicate]
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Add a random query string to the src
You could either do this manually by incrementing the querystring each time you make a change:
<script src="test.js?version=1"></script>
Or if you are using a server side language, you could automatically generate this:
ASP.NET:
<scri...
getting date format m-d-Y H:i:s.u from milliseconds
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I generally opt for the second form as it's easier to read and understand. Additionally, DateTime is far more flexible and robust than the date/time functions. Handling microseconds is a case-in-point.
– Herber...
Using a .php file to generate a MySQL dump
... can be done by the command itself.
That external command will :
be a call to mysqldump, with the right parameters,
and redirect the output to a file.
For example :
mysqldump --user=... --password=... --host=... DB_NAME > /path/to/output/file.sql
Which means your PHP code would look li...
JavaScript equivalent of PHP's in_array()
.../ alerts 'ph' was found
// alerts 'o' was found
Note that I intentionally did not extend the Array prototype as it is generally a bad idea to do so.
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Why the switch statement cannot be applied on strings?
...array but it doesn't really fully understand the notion of a string.
In order to generate the code for a switch statement the compiler must understand what it means for two values to be equal. For items like ints and enums, this is a trivial bit comparison. But how should the compiler compare 2...