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What are the differences between utf8_general_ci and utf8_unicode_ci? [duplicate]
I've got two options for unicode that look promising for a mysql database.
2 Answers
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What does character set and collation mean exactly?
I can read the MySQL documentation and it's pretty clear. But, how does one decide which character set to use? On what data does collation have an effect?
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理解Python的 with 语句 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...码：
with open("/tmp/foo.txt") as file:
data = file.read()
with如何工作？
while this might look like magic, the way Python handles with is more clever than magic. The basic idea is that the statement after with has to evaluate an object that responds to an __enter__() as well as an ...
How do I add indices to MySQL tables?
I've got a very large MySQL table with about 150,000 rows of data. Currently, when I try and run
7 Answers
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Updating MySQL primary key
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MySQL, update multiple tables with one query
... this one query, of course. You can read more about joins here: http://dev.mysql.com/doc/refman/5.0/en/join.html. There's also a couple restrictions for ordering and limiting on multiple table updates you can read about here: http://dev.mysql.com/doc/refman/5.0/en/update.html (just ctrl+f "join").
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Insert, on duplicate update in PostgreSQL?
...rom an answer on Stack Overflow how to perform multiple updates at once in MySQL using the following syntax:
16 Answers
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Bogus foreign key constraint fail
...Two possibilities:
There is a table within another schema ("database" in mysql terminology) which has a FK reference
The innodb internal data dictionary is out of sync with the mysql one.
You can see which table it was (one of them, anyway) by doing a "SHOW ENGINE INNODB STATUS" after the drop f...