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What's the difference between identifying and non-identifying relationships?
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An identifying relationship is when the existence of a row in a child table depends on a row in a parent table. This may be confusing because it's common practice these days to create a pseudokey for a child table, but not make...
SQL UPDATE SET one column to be equal to a value in a related table referenced by a different column
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update q
set q.QuestionID = a.QuestionID
from QuestionTrackings q
inner join QuestionAnswers a
on q.AnswerID = a.AnswerID
where q.QuestionID is null -- and other conditions you might want
I recommend to check what the result set to update is befo...
warning RC2182: duplicate dialog control ID 1002 - C/C++ - 清泛网 - 专注C/C++及内核技术
warning RC2182: duplicate dialog control ID 1002原因：报错行的控件ID值（这里是1002），与其他的控件ID值一样，发生冲突了。解决：resource.h中将值一样的控件ID改为不同的值。原因：报错行的控件ID值（这里是1002），与其他的控件ID值一...
ble 蓝牙透传代码怎么写？ - 创客硬件开发 - 清泛IT社区，为创新赋能！
...用我们这个模块这个地址可以吗？
上图中是控制服务id：SERVICEF000_UUUID = UUID.fromString("0000f000-0000-1000-8000-00805f9b34fb");以及2个控制端口的特征id。
可以做到透传，不过要换透传 id，这个 id 是 io 控制口
晚一些我给你一...
C# Entity-Framework: How can I combine a .Find and .Include on a Model Object?
... .Include(i => i.Brand)
.FistOrDefault(x => x.ItemId == id);
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How do I get the resource id of an image if I know its name?
How do I get the resource id of an image if I know its name (in Android)?
5 Answers
5
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selecting unique values from a column
...o if you want the whole record, the DISTINCT is worthless (unless it is an id field, and you can do a second query where id IN that list). Good news, though, if you have multiple duplicate results as a result of a JOIN you can do a GROUP BY and get the full results filtered.
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Map enum in JPA with fixed values?
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For versions earlier than JPA 2.1, JPA provides only two ways to deal with enums, by their name or by their ordinal. And the standard JPA doesn't support custom types. So:
If you want to do custom type conversions, you'll have to use a provider extension (with Hibe...
Deserialize JSON with C#
...d> data {get; set;}
}
public class FacebookFriend
{
public string id {get; set;}
public string name {get; set;}
}
Then you should be able to do:
Friends facebookFriends = new JavaScriptSerializer().Deserialize<Friends>(result);
The names of my classes are just an example. You...
mysql update column with value from another table
... UPDATE participants_registrations INNER JOIN participants ON participants.id = participants_registrations.participantId INNER JOIN registrations ON registrations.id = participants_registrations.registrationId LEFT JOIN groups ON (groups.id = registrations.groupId) SET registrations.groupId = g...