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Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails
...you should update before creating the constraint so you won't be surprised by queries that should return values that should exist!
– Armfoot
Nov 19 '15 at 22:13
add a comment
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MySQL: How to copy rows, but change a few fields?
...temp table that seems to get copied from the original table. I fixed this by altering the temp table before the update as follows: ALTER TABLE temporary_table MODIFY <auto_inc_not_null_field> INT; Then the update of the primary key to Null would not fail.
– snorris
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How to style CSS role
... imageUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454...
How can I search Git branches for a file or directory?
In Git, how could I search for a file or directory by path across a number of branches?
6 Answers
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How to get object size in memory? [duplicate]
I need to know how much bytes my object consumes in memory (in C#). for example how much my Hashtable , or SortedList , or List<String> .
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How do I use Maven through a proxy?
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I also had this problem, and I solved it by editing the settings.xml file in my .m2 folder.
My settings.xml is like this now:
<settings>
<proxies>
<proxy>
<id>genproxy</id>
<active>true</active>
<...
Can I change multiplier property for NSLayoutConstraint?
...t(_:) on the view that is the closest common ancestor of the items managed by this constraint".
– qix
Jan 4 '17 at 5:26
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Test whether a glob has any matches in bash
...een shells (though apparently not all of the options you use are specified by POSIX), and it's faster than ls -d glob* (the previous accepted answer) becasue it stops when it reaches the first match.
– Ken Bloom
Nov 24 '10 at 14:54
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How can I make a Python script standalone executable to run without ANY dependency?
...orial#Step2;
I have had problems with dependencies that you have to solve by importing packages in the setup file;
I was not able to make it work together with PyQt.
This last reason made me try PyInstaller http://www.pyinstaller.org/.
In my opinion, it is much better because:
It is easier to u...
How do you disable the unused variable warnings coming out of gcc in 3rd party code I do not wish to
...de, you can suppress the warnings for variables and even formal parameters by using GCC's unused attribute. Lets say you have this code snippet:
void func(unsigned number, const int version)
{
unsigned tmp;
std::cout << number << std::endl;
}
There might be a situation, when you n...