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Is there any performance gain in indexing a boolean field?
... think about it like a book. If there were only 3 kinds of words in a book and you index all of them, you would have the same number of index pages as normal pages.
There would be a performance gain if there are relatively few records of one value. For example, if you have 1000 records and 10 of t...
Jackson: how to prevent field serialization
...t still a comment then...!..?
– Saravanabalagi Ramachandran
Oct 22 '15 at 14:04
transient doesnt seem to work for me, ...
What is the difference between ? and Object in Java generics?
...Eclipse seems to be giving me an option to choose between a type of Object and a type of '?'.
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Uri to default sound notification?
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Settings comes from import android.provider.Settings;
– Chris Knight
Oct 10 '13 at 22:16
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How to save a dictionary to a file?
I have problem with changing a dict value and saving the dict to a text file (the format must be same), I only want to change the member_phone field.
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Rake just one migration
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rake db:migrate:redo VERSION=xxxxxxx, but that will run the down and then the up step. You could do this in conjunction with commenting out the down step temporarily.
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How can I read inputs as numbers?
Why are x and y strings instead of ints in the below code?
10 Answers
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Windows batch: sleep [duplicate]
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Haha, so simple and yet so genius :-) Exactly what I was looking for. +1
– Simon
Apr 13 '12 at 21:19
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How to avoid java.util.ConcurrentModificationException when iterating through and removing elements
...ould have mentioned that i remove the elements in another part of the code and not the loop itself.
– RoflcoptrException
Nov 12 '11 at 13:28
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Eclipse executable launcher error: Unable to locate companion shared library
I had Eclipse Indigo installed on my computer with the Android plugin and it was working perfectly for about two weeks. Today, I updated java and quicktime then restarted my computer. When it booted back up, eclipse had completely vanished - all the program files have completely disappeared. When I ...