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mysql Foreign key constraint is incorrectly formed error
... of the details, but I had a composite key with this error which was fixed by adding individual unique indexes for the columns.
– Halvor Holsten Strand
Jan 3 '19 at 12:44
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Can I define a class name on paragraph using Markdown?
...re stuck with language-specific Markdown supersets:
PHP: Markdown Extra
Ruby: Kramdown, Maruku
But if you need to abide by true Markdown syntax, you're stuck with inserting raw HTML, which is less ideal.
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jquery if div id has children
...ries using :parent cannot take advantage of the performance boost provided by the native DOM querySelectorAll() method. To achieve the best performance when using :parent to select elements, first select the elements using a pure CSS selector, then use .filter(":parent").
– Mil...
How to delete projects in IntelliJ 12?
...l appear in the welcome dialog until it is closed and shown again, usually by opening another project from the list, or quitting and restarting IDEA.
How do I run multiple background commands in bash in a single line?
...t operators, ‘&&’ and ‘||’ have equal precedence, followed by ‘;’ and ‘&’, which have equal precedence. in bash manual.
– jinbeom hong
Jun 13 at 5:40
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How do I get class name in PHP?
...ime while get_class_name() is interpreted during runtime. I found this out by trying to access the ::class property(?) of a dynamically generated class and getting the following error: Dynamic class names are not allowed in compile-time ::class fetch. See this answer for more details. I also found...
Difference between single quotes and double quotes in Javascript [duplicate]
...ys supposed to act the same way. I haven't found anything on this problem by googling, so maybe this will help someone.
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Finding differences between elements of a list
... input, however it avoids a whole copy of L.
Accessing the single elements by index is very slow because every index access is a method call in python
numpy.diff is slow because it has to first convert the list to a ndarray. Obviously if you start with an ndarray it will be much faster:
In [22]: ar...
Solution for “Fatal error: Maximum function nesting level of '100' reached, aborting!” in PHP
...sive and can go on endlessly. However, I have put a limit on the recursion by setting a global variable which causes the recursion to stop after 100 recursions.
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“java.lang.OutOfMemoryError: PermGen space” in Maven build [duplicate]
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When I encountered this exception, I solved this by using Run Configurations... panel as picture shows below.Especially, at JRE tab, the VM Arguments are the critical ( "-Xmx1024m -Xms512m -XX:MaxPermSize=1024m -XX:PermSize=512m" ).
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