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SQL JOIN and different types of JOINs
...A
INNER JOIN Table2 B ON A.<Primary-Key> =B.<Foreign-Key>;
1.2: INNER-JOIN: Natural-JOIN implementation
Select A.*, B.Col1, B.Col2 --But no B.ForeignKeyColumn in Select
FROM Table1 A
INNER JOIN Table2 B On A.Pk = B.Fk;
1.3: INNER-JOIN with NON-Equi-join implementation
...
Fastest way to list all primes below N
...
... And it can be made yet faster with additional ~1.2x-1.3x speedup, drastic reduction in memory footprint from O(n) to O(sqrt(n)) and improvement in empirical time complexity, by postponing the addition of primes to the dict until their square is seen in the input. Test it ...
Is Java really slow?
...ntributed to the "Java is slow" reputation:
Before JIT compilation (Java 1.2/1.3), the language was only interpreted, not compiled, and thus very slow.
JIT compilation took time to become efficient (major improvements with each version)
Classloading has become a lot more efficient over the years. ...
Using git repository as a database backend
...──────┼─────────┤
│ MusicBrainz │ 1.2M │ 1K/week │ 30 GiB │ 20 GiB │
│ en.wikipedia │ 21.5M │ 133K/month │ 3 TiB │ 44 GiB │
│ OSM │ 1.7M │ 21K/month │ 726 GiB │ 480 GiB │
Obviously, for that amounts...
How to find list of possible words from a letter matrix [Boggle Solver]
...ore I got to the real work of the code, and reducing input time from 2s to 1.2s means a lot to me.
– Kent Fredric
Apr 14 '09 at 10:04
...
How to choose an AES encryption mode (CBC ECB CTR OCB CFB)?
... with 2^128 elements. Its wide use in important network standards like TLS 1.2 is reflected by a special instruction Intel has introduced to speed up the calculation of GHASH.
Recommendation:
Considering the importance of authentication I would recommend the following two block cipher modes for mos...
Callback functions in C++
...e v) { std::cout << v << " "; });
which prints
5 6.2 8 9.5 11.2
Another application of callbacks is the notification of callers of certain events which enables a certain amount of static / compile time flexibility.
Personally, I use a local optimization library that uses two differ...
OceanBase使用libeasy原理源码分析：服务器端 - 数据库(内核) - 清泛网 - ...
...1.1 将这个request从所在的message中摘下来(request_list_node)
1.2. 回调应用层传入的process：
process函数返回EASY_OK, 则说明应用已经处理完了这个请求了(这种情况出现在当OceanBase 0.4接收到了一个大于2MB的包的时候)，接着调用easy...
Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...
mysql-5.5.20
postfix-2.9.1
courier-authlib-0.62.4.tar.bz2
extmail-1.2.tar.gz
extman-1.1.tar.gz
Unix-Syslog-1.1.tar.gz
perl-GD-2.35-1.el5.rf.i386.rpm
rrdtool-1.2.23
Time-HiRes-1.9725.tar.gz
File-Tail-0.99.3.tar.gz
一、环境配置
1、安装一下过程中所依赖...
How does the Windows Command Interpreter (CMD.EXE) parse scripts?
...ed carets remain doubled.
Phase 1 changes a bit
Expansion errors in step 1.2 or 1.3 abort the CALL, but the error is not fatal - batch processing continues.
Phase 2 tasks are altered a bit
Any newly appearing unquoted, unescaped redirection that was not detected in the first round of phase 2 is...