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Is it a good idea to index datetime field in mysql?
I am working on designing a large database. In my application I will have many rows for example I currently have one table with 4 million records. Most of my queries use datetime clause to select data. Is it a good idea to index datetime fields in mysql database?
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Function to convert column number to letter?
Does anyone have an Excel VBA function which can return the column letter(s) from a number?
28 Answers
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Fundamental difference between Hashing and Encryption algorithms
I see a lot of confusion between hashes and encryption algorithms and I would like to hear some more expert advice about:
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Are static fields inherited?
When static members are inherited, are they static for the entire hierarchy, or just that class, i.e.:
7 Answers
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Regular expression for exact match of a string
I want to match two passwords with regular expression. For example I have two inputs "123456" and "1234567" then the result should be not match (false). And when I have entered "123456" and "123456" then the result should be match (true).
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How do I scroll the UIScrollView when the keyboard appears?
I'm having trouble with my code. I'm trying to move the UIScrollView when I'm editing an UITextField that should be hidden by the keyboard pop.
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jQuery: Adding two attributes via the .attr(); method
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6 Answers
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Numpy: find first index of value fast
How can I find the index of the first occurrence of a number in a Numpy array?
Speed is important to me. I am not interested in the following answers because they scan the whole array and don't stop when they find the first occurrence:
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How do I set a conditional breakpoint in gdb, when char* x points to a string whose value equals “he
Can I specify that I want gdb to break at line x when char* x points to a string whose value equals "hello" ? If yes, how?
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Why would a post-build step (xcopy) occasionally exit with code 2 in a TeamCity build?
A few projects in my client's solution have a post-build event: xcopy the build output to a specific folder. This works fine when building locally. However, in TeamCity, I occasionally get
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