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How do I rename a column in a database table using SQL?
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This is not supported in MySQL, is it?
– ustun
Oct 21 '11 at 11:41
5
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MySQL - ORDER BY values within IN()
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@Vladimir - yes, it is MySQL-specific. The question has the mysql tag.
– Ayman Hourieh
Jun 6 '09 at 1:10
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How do I find which transaction is causing a “Waiting for table metadata lock” state?
...ransactions waiting for locks:
SELECT TRX_ID, TRX_REQUESTED_LOCK_ID, TRX_MYSQL_THREAD_ID, TRX_QUERY
FROM INNODB_TRX
WHERE TRX_STATE = 'LOCK WAIT';
Reference - MySQL Troubleshooting: What To Do When Queries Don't Work, Chapter 6 - Page 96.
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File Hash 扩展：文件哈希计算和 Base64 编码文件，sha256、sha512 哈希 ·...
...全文件传输验证
备份文件一致性检查
文件去重比较
密码存储（建议使用加盐哈希）
相关功能
可以使用 Juan Antonio 的 Terminal 扩展 通过 Linux 命令获取文件的 SHA256 哈希：
sha256sum /absolute/path/to/file
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C++特化模板函数的符号多重定义错误问题 - C/C++ - 清泛网 - 专注C/C++及内核技术
....h 中，结果出现特化模板函数的符号多重定义错误。我要如何组织头文件才能避免多重符号定义错误？我用 /FORCE:MULTIPLE，但我想用一个更好的解决方法。
Lee Kyung Jun
实际上，确实用更好的解决方法。稍后我会解释，但首先让我...
ALTER TABLE without locking the table?
When doing an ALTER TABLE statement in MySQL, the whole table is read-locked (allowing concurrent reads, but prohibiting concurrent writes) for the duration of the statement. If it's a big table, INSERT or UPDATE statements could be blocked for a looooong time. Is there a way to do a "hot alter", li...
MySQL: What's the difference between float and double?
...someone changed a field from float to double. Wondering why, I checked the mysql documentation, but honestly didn't understand what the difference is.
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mysql query order by multiple items
..._activity ASC so sort direction for each column, default sort direction in mysql (with default configuration) is ASC.
– ZurabWeb
Jan 30 '14 at 20:29
add a comment
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MySql - Way to update portion of a string?
I'm looking for a way to update just a portion of a string via MySQL query.
4 Answers
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MySQL: Sort GROUP_CONCAT values
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Sure, see http://dev.mysql.com/doc/refman/...tions.html#function_group-concat:
SELECT student_name,
GROUP_CONCAT(DISTINCT test_score ORDER BY test_score DESC SEPARATOR ' ')
FROM student
GROUP BY student_name;
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