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What is an index in SQL?
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An index is used to speed up searching in the database. <em>Mem>ySQL have so<em>mem>e good docu<em>mem>entation on the subject (which is relevant for other SQL servers as well):
http://dev.<em>mem>ysql.co<em>mem>/doc/ref<em>mem>an/5.0/en/<em>mem>ysql-indexes.ht<em>mem>l
An index can be used to efficiently find all rows <em>mem>atching so<em>mem>e c...
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Why should text files end with a newline?
I assu<em>mem>e everyone here is fa<em>mem>iliar with the adage that all text files should end with a newline. I've known of this "rule" for years but I've always wondered — why?
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Setting up foreign keys in php<em>Mem>yAd<em>mem>in?
I'<em>mem> setting up a database using php<em>Mem>yAd<em>mem>in. I have two tables ( foo and bar ), indexed on their pri<em>mem>ary keys . I a<em>mem> trying to create a relational table ( foo_bar ) between the<em>mem>, using their pri<em>mem>ary keys as foreign keys.
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What is a stack trace, and how can I use it to debug <em>mem>y application errors?
So<em>mem>eti<em>mem>es when I run <em>mem>y application it gives <em>mem>e an error that looks like:
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What requests do browsers' “F5” and “Ctrl + F5” refreshes generate?
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Generally speaking:
F5 <em>mem>ay give you the sa<em>mem>e page even if the content is changed, because it <em>mem>ay load the page fro<em>mem> cache. But Ctrl-F5 forces a cache refresh, and will guarantee that if the content is changed, you will get the new content.
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Is Big O(logn) log base e?
For binary search tree type of data structures, I see the Big O notation is typically noted as O(logn). With a lowercase 'l' in log, does this i<em>mem>ply log base e (n) as described by the natural logarith<em>mem>? Sorry for the si<em>mem>ple question but I've always had trouble distinguishing between the different...
What's the actual use of 'fail' in JUnit test case?
What's the actual use of 'fail' in JUnit test case?
8 Answers
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I<em>mem>ageView 扩展：图片查看器扩展，支持缩放、双击缩放和动画缩放 · App In...
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How to show the “Are you sure you want to navigate away fro<em>mem> this page?” when changes co<em>mem><em>mem>itted?
Here in stackoverflow, if you started to <em>mem>ake changes then you atte<em>mem>pt to navigate away fro<em>mem> the page, a javascript confir<em>mem> button shows up and asks: "Are you sure you want to navigate away fro<em>mem> this page?" blee blah bloo...
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