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MySQL Cannot drop index needed in a foreign key constraint
...column. I'm trying to remove the current index but keep getting the error MySQL Cannot drop index needed in a foreign key constraint
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常用Sql - 数据库(内核) - 清泛网 - 专注C/C++及内核技术
常用Sqlmysql：drop table if exists tablename;不能写成drop table tablename if exists tablename;mysql：建立索引SqlCREATE TABLE t...mysql：drop table if exists tablename;
不能写成
drop table tablename if exists tablename;
mysql：建立索引Sql
CREATE TABLE tablename (
`ID...
If table exists drop table then create it, if it does not exist just create it
...ROP TABLE IF EXISTS `foo`;
CREATE TABLE `foo` ( ... );
Try searching the MySQL documentation first if you have any other problems.
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MySQL string replace
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http://www.example.com/articles/news/43
http://www.electrictoolbox.com/mysql-find-replace-text/
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json_encode is returning NULL?
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I bet you are retrieving data in non-utf8 encoding: try to put mysql_query('SET CHARACTER SET utf8') before your SELECT query.
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MySQL “NOT IN” query
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NOT IN vs. NOT EXISTS vs. LEFT JOIN / IS NULL in MySQL
MySQL, as well as all other systems except SQL Server, is able to optimize LEFT JOIN / IS NULL to return FALSE as soon the matching value is found, and it is the only system that cared to document this behavior.
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How to change the CHARACTER SET (and COLLATION) throughout a database?
Our previous programmer set the wrong collation in a table (Mysql). He set it up with Latin collation, when it should be UTF8, and now I have issues. Every record with Chinese and Japan character turn to ??? character.
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How can I append a string to an existing field in MySQL?
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You need to use the CONCAT() function in MySQL for string concatenation:
UPDATE categories SET code = CONCAT(code, '_standard') WHERE id = 1;
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WinImage 映像读写工具 - 软件下载 - 清泛网 - 专注IT技能提升
...动器中的内容，支持转换虚拟硬盘映像，可将物理驱动器重置为可引导，可读取并写入磁盘。
8.50WinXP,Win7,Win8,Win10712K
WinImage 映像读写工具 - 软件下载 - 清泛网 - 专注IT技能提升
...动器中的内容，支持转换虚拟硬盘映像，可将物理驱动器重置为可引导，可读取并写入磁盘。
8.50WinXP,Win7,Win8,Win10712K