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MySQL NULL gotcha; or, yes, Virginia, types do matter ender.com 29 Apr 2009 | 09:15 am
If you spend a lot of time dealing with languages that are loosely typed and have scalars running wild, then like me, you may be prone to doing something like this: mysql> select NOW(); select GREATE...
MySQL “pretty printing” smaftoul.wordpress.com 9 Apr 2009 | 01:57 am
I just discovered an apparently wide spread tip for mysql: mysql> select 1, 2, 3, 4 ; +---+---+---+---+ | 1 | 2 | 3 | 4 | +---+---+---+---+ | 1 | 2 | 3 | 4 | +---+---+---+---+ 1 row in set (0.0...
Linux下mysql数据库远程访问设置方法 wabseo.com 15 May 2012 | 05:12 pm
1、修改localhost 更改 “mysql” 数据库里的 “user” 表里的 “host” 项，从”localhost”改成”%” mysql>use mysql; mysql>update user set host = ‘%’ where user = ‘root’; mysql>select host, user from user; mysql>FLUSH PRIVILEG...
MySQL Select Last n Records Without Changing The Order enghiong.com 17 Apr 2012 | 03:42 am
Let’s say I am going to select the last 10 records of a table. The main consideration would be using the query: SELECT recordId FROM myTable ORDER BY recordId DESC LIMIT 10 The above query would ...
MySQL Bar Chart from the Command Line onlinemarketer.com 6 May 2009 | 01:57 am
MySQL Command Line Bar Chart I just ran accross this really cool method of generating a bar chart from the mysql command line using the mysql repeat command: mysql> select date_format( create_time, ...
MYSQL的profile使用 9enjoy.com 24 Apr 2012 | 03:08 pm
MYSQL的profiling功能要在Mysql版本5.0.37以上才能使用。 开启profiling: set profiling=1; 查看是否设置生效： select @@profiling; 默认是0，设置成功是1 运行SQL语句： mysql> select * FROM hx_line WHERE id = '1455023'; 查看profiles mys...
Limited SELECT count(*) mysqldiary.com 14 May 2010 | 09:52 am
A SELECT statement with COUNT returns the number of rows retrieved by the SELECT statement (see mysql select count). For performance reasons, the desired result is to limit that count. Including a LIM...
MYSQL的profile使用 9enjoy.com 24 Apr 2012 | 11:08 am
MYSQL的profiling功能要在Mysql版本5.0.37以上才能使用。 开启profiling: set profiling=1; 查看是否设置生效： select @@profiling; 默认是0，设置成功是1 运行SQL语句： mysql> select * FROM hx_line WHERE id = '1455023'; 查看profiles mys...
MySQL Select Last n Records Without Changing The Order enghiong.com 16 Apr 2012 | 11:42 pm
Let's say I am going to select the last 10 records of a table. The main consideration would be using the query: SELECT recordId FROM myTable ORDER BY recordId DESC LIMIT 10 The above query would selec...
Trắc nghiệm kiến thức ngôn ngữ PERL baomathethong.blogspot.com 8 Aug 2012 | 05:24 pm
Trong bài này, chúng ta sẽ trắc nghiệm một số kiến thức cơ bản về ngôn ngữ PERL. Câu 1. When you're pattern matching, you describe the pattern using: 1. A string in double quotes 2. A MySQL select s...
