大约有 1,959 项符合查询结果（耗时：0.0100秒） [XML]
Optimal way to concatenate/aggregate strings
...com/en-us/sql/t-sql/functions/string-agg-transact-sql
GROUP_CONCAT() in MySQL
http://dev.mysql.com/doc/refman/5.7/en/group-by-functions.html#function_group-concat
(Thanks to @Brianjorden and @milanio for Azure update)
Example Code:
select Id
, STRING_AGG(Name, ', ') Names
from Demo
group by I...
Copy table without copying data
...her processes. Basically caused a massive lock meltdown and had to restart MySQL.
– Mark B
Jul 29 '14 at 15:57
6
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Delete sql rows where IDs do not have a match from another table
I'm trying to delete orphan entries in a mysql table.
3 Answers
3
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How many database indexes is too many?
...
I made some simple tests on my real project and real MySql database. I already answered in this topic: What is the cost of indexing multiple db columns?
But I think it will be better if I quote it here:
I made some simple tests using my real
project and real MySql databa...
Windows 7, 64 bit, DLL problems
...lls other DLL files.
In my case, it was not three .ocx files, but missing MySQL connector DLL file. After installing of MySQL Connector for .NET on server, the problem disappeared.
So, in short, the solution is: check if all your project references are there.
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How to store date/time and timestamps in UTC time zone with JPA and Hibernate
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@VladMihalcea if it's for Mysql, one need to tell MySql to use timezone by using useTimezone=true in the connection string. Then only setting property hibernate.jdbc.time_zone will work
– TheCoder
Oct 13 '18 at 1...
How can I select rows with most recent timestamp for each key value?
...but here's more info if you wish, as well as other examples. It's from the MySQL manual, but above query works with every RDBMS (implementing the sql'92 standard).
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improve this answer
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Is it possible to delete an object's property in PHP?
...erties, this often happens in applications fetching from databases such as MySQL the records as an object instead of an array (using standard functions such as mysql_fetch_object()).
– gaborous
Jan 21 '15 at 20:37
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Using PHP with Socket.io
...of us are only able to get a cheap host that will only let you use php and mysql.
– Lanbo
Oct 24 '11 at 11:55
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Fetch the row which has the Max value for a column
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Anyone care to post a link to the MySQL equivalent of this, if there is one?
– redolent
Jan 10 '15 at 2:35
2
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