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How do MySQL indexes work?
I am really interested in how MySQL indexes work, more specifically, how can they return the data requested without scanning the entire table?
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How to use MySQL DECIMAL?
I can't quite get a grasp of MySQL's DECIMAL. I need the row to be able to contain a number anywhere from 00.0001 to 99.9999. How would I structure it to work like so?
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css中使用变量，:root伪元素的使用 - 更多技术 - 清泛网 - 专注C/C++及内核技术
css中使用变量，:root伪元素的使用css_root前言使用css的全局变量，可以减少写很多重复代码。比如设置一个全局主题色变量，整个项目用到这个颜色的地方，都用变量设置，就很方便了。一、root伪类和css变量1 :root伪类在刚 前...
Installing in Homebrew errors
...ething installed via homebrew that requires special user permissions, like mysql, make sure to give those permissions back (as the above command gives recursive ownership to everything inside /usr/local to you ($USER). In the case of mysql, it's…
sudo chown -RL mysql:mysql /usr/local/mysql/dat...
MySQL Error 1093 - Can't specify target table for update in FROM clause
...handle the OP's exact query, please see other answers to this question
In MySQL, you can't modify the same table which you use in the SELECT part.
This behaviour is documented at:
http://dev.mysql.com/doc/refman/5.6/en/update.html
Maybe you can just join the table to itself
If the logic is simple...
#1071 - Specified key was too long; max key length is 767 bytes
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767 bytes is the stated prefix limitation for InnoDB tables in MySQL version 5.6 (and prior versions). It's 1,000 bytes long for MyISAM tables. In MySQL version 5.7 and upwards this limit has been increased to 3072 bytes.
You also have to be aware that if you set an index on a big char ...
PHP date() format when inserting into datetime in MySQL
...pass to the date() function in PHP if I want to insert the result into a MySQL datetime type column?
13 Answers
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MySQL: Set user variable from result of query
Is it possible to set an user variable based on the result of a query in MySQL?
4 Answers
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How to store Java Date to Mysql datetime with JPA
Can any body tell me how can I store Java Date to Mysql datetime...?
12 Answers
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how to customize `show processlist` in mysql?
...any way you like.
The INFORMATION_SCHEMA.PROCESSLIST table was added in MySQL 5.1.7. You can find out which version you're using with:
SELECT VERSION()
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