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How do I check to see if a value is an integer in MySQL?
...s the REGEXP operator, matching the string to a regular expression. Simply do
select field from table where field REGEXP '^-?[0-9]+$';
this is reasonably fast. If your field is numeric, just test for
ceil(field) = field
instead.
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How to use > in an xargs command?
...e the output of that grep to a separate file. My guess would have been to do something like this
3 Answers
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How do I safely pass objects, especially STL objects, to and from a DLL?
How do I pass class objects, especially STL objects, to and from a C++ DLL?
4 Answers
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How to list only top level directories in Python?
...t to be able to list only the directories inside some folder.
This means I don't want filenames listed, nor do I want additional sub-folders.
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How do I center align horizontal menu?
...'m sorry to ask this after such a long time, but what if I have a css drop down? I can't use overflow:hidden in the parent then. But it'll still overflow like here: homeafrika.com .
– Samia Ruponti
Mar 28 '12 at 18:26
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How can I get a resource “Folder” from inside my jar File?
I have a resources folder/package in the root of my project, I "don't" want to load a certain File. If I wanted to load a certain File, I would use class.getResourceAsStream and I would be fine!! What I actually want to do is to load a "Folder" within the resources folder, loop on the Files inside t...
How efficient is locking an unlocked mutex? What is the cost of a mutex?
...x? I.e. how much assembler instructions are there likely and how much time do they take (in the case that the mutex is unlocked)?
The precise assembler instructions are the least overhead of a mutex - the memory/cache coherency guarantees are the main overhead. And less often a particular lock is ...
ThreadStart with parameters
How do you start a thread with parameters in C#?
16 Answers
16
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Change One Cell's Data in mysql
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@Brian Hooper: I do need to change the value, I mean to ask whether I can do this: UPDATE mytable SET column1 = new_value WHERE column1 = old_value; ??
– weefwefwqg3
Jan 24 '18 at 14:22
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append multiple values for one key in a dictionary [duplicate]
...python and I have a list of years and values for each year. What I want to do is check if the year already exists in a dictionary and if it does, append the value to that list of values for the specific key.
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