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How do I put an 'if clause' in an SQL string?
So here's what I want to do on my MySQL database.
9 Answers
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ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock'
I installed MySQL on Mac OS X Mountain Lion with homebrew install mysql , but when I tried mysql -u root I got the following error:
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淘宝网采用什么技术架构来实现网站高负载的 - 更多技术 - 清泛网 - 专注C/C...
...淘宝目前的一些底层技术框架以及自己的一些感触来说说如何构建一个可 伸缩，高性能，高可用性的分布式互联网应用。时间过得很快，来淘宝已经两个月了，在这两个月的时间里，自己也感受颇深。下面就结合淘宝目前的一...
What is the difference between “INNER JOIN” and “OUTER JOIN”?
...ess of whether or not the other table has a matching value.
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MySQL 8.0 Reference Manual - Join Syntax
Oracle Join operations
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MySQL error 1449: The user specified as a definer does not exist
...ments
How to change the definer for stored procedures
Example:
UPDATE `mysql`.`proc` p SET definer = 'user@%' WHERE definer='root@%'
Be careful, because this will change all the definers for all databases.
2. Create the missing user
If you've found following error while using MySQL databa...
How to change max_allowed_packet size
I am having a problem with BLOB fields in my MySQL database - when uploading files larger than approx 1MB I get an error Packets larger than max_allowed_packet are not allowed.
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What is the most ridiculous pessimization you've seen? [closed]
...'s "too big".
Create an archive table for retired records, but continue to UNION it with the production table.
Duplicate entire databases by (division/customer/product/etc.)
Resist adding columns to an index because it makes it too big.
Create lots of summary tables because recalculating from raw da...
How to grant remote access to MySQL for a whole subnet?
...imply use a percent sign as a wildcard in the IP address.
From http://dev.mysql.com/doc/refman/5.1/en/grant.html
You can specify wildcards in the host name. For example, user_name@'%.example.com' applies to user_name for any host in the example.com domain, and user_name@'192.168.1.%' applies to...
二维码的生成细节及原理 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...是分成不同的Block，然后对各个Block进行纠错编码，对于如何分组，我们可以查看QR Code Spec的第33页到44页的Table-13到Table-22的定义表。注意最后两列：
Number of Error Code Correction Blocks ：需要分多少个块。
Error Correction Code Per Blo...
How do I remove a MySQL database?
...e from my last question that a problem caused some more problems, Reading MySQL manuals in MySQL monitor?
6 Answers
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