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Delete sql rows where IDs do not have a match from another table
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Using LEFT JOIN/IS NULL:
DELETE b FROM BLOB b
LEFT JOIN FILES f ON f.id = b.fileid
WHERE f.id IS NULL
Using NOT EXISTS:
DELETE FROM BLOB
WHERE NOT EXISTS(SELECT NULL
FROM FILES f
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Open a file with Notepad in C#
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You need System.Diagnostics.Process.Start().
The simplest example:
Process.Start("notepad.exe", fileName);
More Generic Approach:
Process.Start(fileName);
The second approach is probably a better practice as this will ca...
How to encode URL parameters?
I am trying to pass parameters to a URL which looks like this:
4 Answers
4
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What is the equivalent of “!=” in Excel VBA?
The problem is that != does not work as a function in excel vba.
4 Answers
4
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How to check if element exists using a lambda expression?
Specifically, I have TabPane, and I would like to know if there is element with specific ID in it.
3 Answers
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Unable to hide welcome screen in Emacs
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Add the following to your $HOME/.emacs:
(setq inhibit-startup-screen t)
The next time you start Emacs, the welcome screen shouldn't appear. If you already have Emacs open with the welcome screen, you can kill it with C-x k (Control-x, then k).
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Struct inheritance in C++
Can a struct be inherited in C++?
6 Answers
6
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How to convert an array to object in PHP?
...lue)
{
$object->$key = $value;
}
As Edson Medina pointed out, a really clean solution is to use the built-in json_ functions:
$object = json_decode(json_encode($array), FALSE);
This also (recursively) converts all of your sub arrays into objects, which you may or may not want. Unfortunat...
Example of UUID generation using Boost in C++
I want to generate just random UUID's, as it is just important for instances in my program to have unique identifiers. I looked into Boost UUID , but I can't manage to generate the UUID because I don't understand which class and method to use.
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How to unset max-height?
How to I reset the max-height property to its default, if it has been previously set in some CSS rule? This doesn't work:
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