大约有 19,000 项符合查询结果（耗时：0.0373秒） [XML]
Error 1022 - Can't write; duplicate key in table
...
I thought MySQL Workbench would have fixed this when exporting the creation script, but that's what I get for "Ignore"ing the warning about this sort of thing when I opened the project.
– SnowInferno
...
You can't specify target table for update in FROM clause
I have a simple mysql table:
11 Answers
11
...
What is SQL injection? [duplicate]
...d queries, or applying your language/toolkit's escaping functions (such as mysql_real_escape_string() in PHP).
Once you understand SQL Injection you'll get the joke behind this cartoon.
share
|
imp...
Drop multiple tables in one shot in mysql
...m in the correct order, nor whether they actually exist.
N.B. this is for MySQL only (as in the question). Other databases likely have different methods for doing this.
share
|
improve this answer
...
Is there a naming convention for MySQL?
...e your standard, then run with it.
To answer your question outright - no, MySQL doesn't have a preferred naming convention/standard, so rolling your own is fine (and yours seems logical).
share
|
i...
一分钟明白 VS manifest 原理 - C/C++ - 清泛网 - 专注C/C++及内核技术
...不知加载哪个，于是manifest文件来指明。
manifest在哪儿，如何创建。
如果用VS开发，可以Set通过porperty->configuration properties->linker->manifest file->Generate manifest To Yes来自动创建manifest来指定系统的和CRT的assembly版本。
除了这样产生外...
mysql Foreign key constraint is incorrectly formed error
...
mysql error texts doesn't help so much, in my case, the column had "not null" constraint, so the "on delete set null" was not allowed
share
...
Django connection to PostgreSQL: “Peer authentication failed”
...I am receiving when I try to get to my Django admin site. I had been using MySQL database no problem. I am new to PostgreSQL, but decided to switch because the host I ultimately plan to use for this project does not have MySQL.
...
Update one MySQL table with values from another
I'm trying to update one MySQL table based on information from another.
2 Answers
2
...
How to prepend a string to a column value in MySQL?
...
Many string update functions in MySQL seems to be working like this:
If one argument is null, then concatenation or other functions return null too.
So, to update a field with null value, first set it to a non-null value, such as ''
For example:
update ta...