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INNER JOIN vs LEFT JOIN performance in SQL Server
I've created SQL command that uses INNER JOIN on 9 tables, anyway this command takes a very long time (more than five minutes). So my folk suggested me to change INNER JOIN to LEFT JOIN because the performance of LEFT JOIN is better, despite what I know. After I changed it, the speed of query got si...
Is gcc 4.8 or earlier buggy about regular expressions?
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<regex> was implemented and released in GCC 4.9.0.
In your (older) version of GCC, it is not implemented.
That prototype <regex> code was added when all of GCC's C++0x support was highly experimental, tracking early C++0x drafts and being ma...
Reading and writing environment variables in Python? [duplicate]
My python script which calls many python functions and shell scripts. I want to set a environment variable in Python (main calling function) and all the daughter processes including the shell scripts to see the environmental variable set.
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Create SQLite Database and table [closed]
Within C# application code, I would like to create and then interact with one or more SQLite databases.
1 Answer
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WinDbg基础资料（日本語） - IT优秀资料 - 清泛网 - 专注C/C++及内核技术
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「~* g」のコマンドで引き続き実行させると、「Breakpoint 0 hit」のメッセージが表示される
「~* k」のコマンドでCall Stack取得
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Tip09:.NETのC...
Learning assembly [closed]
... learn Assembly language. The main reason to do so is being able to understand disassembled code and maybe being able to write more efficient parts of code (for example, through c++), doing somethings like code caves, etc. I saw there are a zillion different flavors of assembly, so, for the purposes...
Storing Image Data for offline web application (client-side storage database)
...ffer in javascript, while js blob has no equivalent in sqlite. Blob cannot convert to arraybuffer, although it can be structurally cloned.
– Kyaw Tun
Jan 2 '13 at 14:24
add a ...
How to create REST URLs without verbs?
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Sometimes I find it useful to convert the words into a "processing resource" like "activator" or "validator". As per RFC 2616 POST can be used to "Provide a block of data...to a data-handling process"
– Darrel Miller
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How to encrypt/decrypt data in php?
... using BINARY or VARBINARY columns. If this is not an option, you can also convert the binary data into a textual representation using base64_encode() or bin2hex(), doing so requires between 33% to 100% more storage space.
Decryption
Decryption of the stored values is similar:
function pkcs7_unpa...
Why is reading lines from stdin much slower in C++ than Python?
I wanted to compare reading lines of string input from stdin using Python and C++ and was shocked to see my C++ code run an order of magnitude slower than the equivalent Python code. Since my C++ is rusty and I'm not yet an expert Pythonista, please tell me if I'm doing something wrong or if I'm mis...