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INSERT INTO…SELECT for all MySQL columns
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那些我印象深刻的建议和教诲 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...负有心人”和“蠢”之间可能连窗户纸都没有，只看个人如何面对了。
多用Google吧
我工作的第一天，项目经理把我叫去说：给你们讲讲JUnit, SVN，Ant, JBuilder的用法，明天开始用。这四样东西我以前都没有接触过，第一反应就是...
Count the number of occurrences of a string in a VARCHAR field?
...test 0
test4 valuevaluevaluevaluevalue 5
I don't have MySQL install, but goggled to find the Equivalent of LEN is LENGTH while REPLACE is same.
So the equivalent query in MySql should be
SELECT TITLE,DESCRIPTION, (LENGTH(DESCRIPTION) - LENGTH(REPLACE(DESCRIPTION, 'value', ''))...
In MySQL queries, why use join instead of where?
... Performance Perspective:
Where supported (Oracle 9i+, PostgreSQL 7.2+, MySQL 3.23+, SQL Server 2000+), there is no performance benefit to using either syntax over the other. The optimizer sees them as the same query. But more complex queries can benefit from using ANSI-92 syntax:
Ability to ...
count(*) vs count(column-name) - which is more correct? [duplicate]
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there is a performance difference (at least in MySQL) as well (see my answer).
– nickf
Jun 9 '10 at 7:51
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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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MySQL Multiple Joins in one query?
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WAMP/XAMPP is responding very slow over localhost
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This is caused by IPV6. Here is how you make MYSQL not use it. (so, without disabling IPV6)
edit mysql file 'my.ini'
under the [wampmysqld] add the following:
bind-address = ::
Save file and restart mysql service
enjoy!
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Export to CSV via PHP
...p, $fields);
}
fclose($fp);
?>
First you must load the data from the mysql server in to a array
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Finding duplicate values in MySQL
I have a table with a varchar column, and I would like to find all the records that have duplicate values in this column. What is the best query I can use to find the duplicates?
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