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What's the difference between VARCHAR and CHAR?
What's the difference between VARCHAR and CHAR in MySQL?
14 Answers
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Can\'t connect to local MySQL server through socket \'/tmp/mysql.sock\...
Can't connect to local MySQL server through socket '/tmp/mysql.sock'ln -s var lib mysql mysql.sock tmp mysql.sock 建个link即可，不解释。
ln -s /var/lib/mysql/mysql.sock /tmp/mysql.sock
建个link即可，不解释。MySQL mysql.sock
Creation timestamp and last update timestamp with Hibernate and MySQL
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I would do this using a MySQL trigger so that even if the full entity is not saved or is modified by any external application or manual query, it'll still update these fields.
– Webnet
Jul 25 '13 at 12:09
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MySQL remove all whitespaces from the entire column
...UPDATE `table` SET `col_name` = REPLACE(`col_name`, '\n', '')
http://dev.mysql.com/doc/refman/5.0/en/string-functions.html#function_replace
To remove first and last space(s) of column :
UPDATE `table` SET `col_name` = TRIM(`col_name`)
http://dev.mysql.com/doc/refman/5.0/en/string-functions.htm...
MyISAM versus InnoDB [closed]
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But, frequent reading, almost no writing, use MyISAM
Full-text search in MySQL <= 5.5, use MyISAM
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Difference between Key, Primary Key, Unique Key and Index in MySQL
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KEY and INDEX are synonyms in MySQL. They mean the same thing. In databases you would use indexes to improve the speed of data retrieval. An index is typically created on columns used in JOIN, WHERE, and ORDER BY clauses.
Imagine you have a table called...
Get all table names of a particular database by SQL query?
...working on application which can deal with multiple database servers like "MySQL" and "MS SQL Server".
19 Answers
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How can you determine how much disk space a particular MySQL table is taking up?
Is there a quick way to determine how much disk space a particular MySQL table is taking up? The table may be MyISAM or Innodb.
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How do I convert from BLOB to TEXT in MySQL?
I have a whole lot of records where text has been stored in a blob in MySQL. For ease of handling I'd like to change the format in the database to TEXT... Any ideas how easily to make the change so as not to interrupt the data - I guess it will need to be encoded properly?
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MFC RadioButton用法详解 - C/C++ - 清泛网 - 专注C/C++及内核技术
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DDX_Control(pDX, IDC_RADIO9, m_RBtGroup4);
}
问题一：如何更改RadioButton默认值？？？
方法1
在定义控件变量时，默认变量初值为-1，表示此组的任何RadioButton均不被选中，如果需要改变初始默认按钮的设置情况，只需要在...