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Using LIMIT within GROUP BY to get N results per group?
... behavior of both quirks is not guaranteed. Revised answer as follows.
In MySQL 5.x you can use poor man's rank over partition to achieve desired result. Just outer join the table with itself and for each row, count the number of rows lesser than it. In the above case, lesser row is the one with hi...
Sync data between Android App and webserver [closed]
...logic for database like: How to sync SQLite database on Android phone with MySQL database on server?
Best Luck to all new learner. :)
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SQL query to group by day
... (from Q8-Coder):
GROUP BY dateadd(DAY,0, datediff(day,0, created))
For MySQL:
GROUP BY year(datefield), month(datefield), day(datefield)
or better (from Jon Bright):
GROUP BY date(datefield)
For Oracle:
GROUP BY to_char(datefield, 'yyyy-mm-dd')
or faster (from IronGoofy):
GROUP BY trun...
Update a column value, replacing part of a string
I have a table with the following columns in a MySQL database
6 Answers
6
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Reason for Column is invalid in the select list because it is not contained in either an aggregate f
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@davidblaine, MySQL has a function GROUP_CONCAT() for that. dev.mysql.com/doc/refman/5.5/en/… But in standard SQL, each column should contain only one value. That's fundamental to relational theory too.
– Bill Kar...
How to do 3 table JOIN in UPDATE query?
...need a visual aid to get your joins correct: browse-tutorials.com/tutorial/mysql-joins-visual-representation
– ram4nd
Jan 27 '17 at 9:29
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What is the simplest SQL Query to find the second largest value?
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I see both some SQL Server specific and some MySQL specific solutions here, so you might want to clarify which database you need. Though if I had to guess I'd say SQL Server since this is trivial in MySQL.
I also see some solutions that won't work because they fail to...
13 种激励程序员的方法 - 创意 - 清泛网 - 专注C/C++及内核技术
...导者应该确定最终的目的和目标，并授权技术人员弄清楚如何最好地实现。
10.简化和优化
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我们这里5元30M - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...老总说:在我们大寒冥国,网络带宽都是20M起,不知贵国情况如何?场面一度陷入僵局。这 在一次国际洽谈会上,一个韩国高管对一位中国运营商的年轻老总说:在我们大寒冥国,网络带宽都是20M起,不知贵国情况如何?场面一度陷入僵局...
VS Addin插件配置、部署 - C/C++ - 清泛网 - 专注C/C++及内核技术
...本开发入门》介绍了VS插件基本的开发步骤，接下来介绍如何部署开发好的插件到用户电脑上。我们上一篇《VS插件基本开发入门》介绍了VS插件基本的开发步骤，接下来介绍如何部署开发好的插件到用户电脑上。
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