大约有 30,000 项符合查询结果（耗时：0.0564秒） [XML]
How can I do an UPDATE statement with JOIN in SQL Server?
...f your SQL DBMS doesn't support MERGE):
ANSI/ISO:
update ud
set assid = (
select sale.assid
from sale
where sale.udid = ud.id
)
where exists (
select *
from sale
where sale.udid = ud.id
);
MySQL:
update ud u
inner join sale s on
...
SQL update fields of one table from fields of another one
...1 = a.column1,
column2 = a.column2,
column3 = a.column3
FROM a
WHERE a.id = b.id
AND b.id = 1
share
|
improve this answer
|
follow
|
...
Android destroying activities, killing processes
...
First please have a look at this:
onPause() Called when the system is about to start resuming a
previous activity. This is typically used to commit unsaved changes to
persistent data, stop animations and other things that may be
consuming CPU, etc. Implementation...
WITH (NOLOCK) vs SET TRANSACTION ISOLATION LEVEL READ UNCOMMITTED
...ll about consistency. If you care then be aware that you could get what is called dirty reads which could influence other data being manipulated on incorrect information.
I personally don't think I have seen any problems from this but that may be more due to how I use nolock. You need to be aware t...
Rails find record with zero has_many records associated [duplicate]
...overflow.com/a/5570221/417872
City.includes(:photos).where(photos: { city_id: nil })
share
|
improve this answer
|
follow
|
...
The current SynchronizationContext may not be used as a TaskScheduler
I am using Tasks to run long running server calls in my ViewModel and the results are marshalled back on Dispatcher using TaskScheduler.FromSyncronizationContext() . For example:
...
Migration: Cannot add foreign key constraint
...ma::create('priorities', function($table) {
$table->increments('id', true);
$table->integer('user_id')->unsigned();
$table->string('priority_name');
$table->smallInteger('rank');
$table->text('class');
$table->timestamps('timecreat...
How to get unique device hardware id in Android? [duplicate]
How to get the unique device ID in Android which cannot be changed when performing a phone reset or OS update?
3 Answers
...
Parallel foreach with asynchronous lambda
...
@Afshin_Zavvar: If you call Task.Run without awaiting the result, then that's just throwing fire-and-forget work onto the thread pool. That is almost always a mistake.
– Stephen Cleary
May 10 '18 at 22:57
...
Find object by id in an array of JavaScript objects
...
Use the find() method:
myArray.find(x => x.id === '45').foo;
From MDN:
The find() method returns the first value in the array, if an element in the array satisfies the provided testing function. Otherwise undefined is returned.
If you want to find its index ...