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Simple way to transpose columns and rows in SQL?
How do I simply switch columns with rows in SQL?
Is there any simple command to transpose?
9 Answers
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How to sort the letters in a string alphabetically in Python
Is there an easy way to sort the letters in a string alphabetically in Python?
7 Answers
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Using arrays or std::vectors in C++, what's the performance gap?
In our C++ course they suggest not to use C++ arrays on new projects anymore. As far as I know Stroustroup himself suggests not to use arrays. But are there significant performance differences?
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How to merge every two lines into one from the command line?
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awk:
awk 'NR%2{printf "%s ",$0;next;}1' yourFile
note, there is an empty line at the end of output.
sed:
sed 'N;s/\n/ /' yourFile
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Error in plot.new() : figure margins too large, Scatter plot
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Every time you are creating plots you might get this error - "Error in plot.new() : figure margins too large". To avoid such errors you can first check par("mar") output. You should be getting:
[1] 5.1 4.1 4.1 2.1
To change that write:
par(mar=c(1...
How to convert/parse from String to char in java?
How do I parse a String value to a char type, in Java?
14 Answers
14
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Http长连接200万尝试及调优 - 更多技术 - 清泛网 - 专注C/C++及内核技术
Http长连接200万尝试及调优对于一个server，我们一般考虑他所能支撑的qps，但有那么一种应用， 我们需要关注的是它能支撑的连接数个数，而并非qps，当然qps也是我们...对于一个server，我们一般考虑他所能支撑的qps，但有那么一...
Cannot use ref or out parameter in lambda expressions
Why can't you use a ref or out parameter in a lambda expression?
5 Answers
5
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varbinary to string on SQL Server
...to a varchar" can mean different things.
If the varbinary is the binary representation of a string in SQL Server (for example returned by casting to varbinary directly or from the DecryptByPassPhrase or DECOMPRESS functions) you can just CAST it
declare @b varbinary(max)
set @b = 0x546869732069732...
When is it better to use String.Format vs string concatenation?
I've got a small piece of code that is parsing an index value to determine a cell input into Excel. It's got me thinking...
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