大约有 40,000 项符合查询结果（耗时：0.0455秒） [XML]
PostgreSQL delete with inner join
... The best answer, especially the first one, as it allows you to match by multiple fields.
– Kostanos
Nov 14 '17 at 14:58
add a comment
|
...
How to annotate MYSQL autoincrement field with JPA annotations
...=GenerationType.IDENTITY)
private Long id;
The other 2 approaches stated by Pascal in his answer were not working for me.
share
|
improve this answer
|
follow
...
MySQL Insert into multiple tables? (Database normalization?)
...in the same query, but found out it's impossible?
So I want to insert it by simply using multiple queries i.e;
8 Answers
...
How can you make a custom keyboard in Android?
...;
// Lookup the KeyboardView
mKeyboardView= (KeyboardView)findViewById(R.id.keyboardview);
// Attach the keyboard to the view
mKeyboardView.setKeyboard( mKeyboard );
// Do not show the preview balloons
//mKeyboardView.setPreviewEnabled(false);
// Install the ke...
How to implement a many-to-many relationship in PostgreSQL?
...;
I made a few adjustments:
The n:m relationship is normally implemented by a separate table - bill_product in this case.
I added serial columns as surrogate primary keys. In Postgres 10 or later consider an IDENTITY column instead. See:
Safely rename tables using serial primary key columns
Auto...
Difference between “@id/” and “@+id/” in Android
...en referencing android: symbols, because those are already defined for you by the platform and you can't make your own in that namespace anyway.
This namespace is the namespace of the framework.
for example, you need to use @android:id/list because this the id the framework expects to find.. (the f...
How do I find duplicates across multiple columns?
...s
join (
select name, city, count(*) as qty
from [stuff]
group by name, city
having count(*) > 1
) t on s.name = t.name and s.city = t.city
share
|
improve this answer
|...
How to get RelativeLayout working with merge and include?
I have been trying for a few days now to make my layouts more efficient by converting from using several levels of nested LinearLayouts to one RelativeLayout and have come across a few problems that I haven not been able to find a workaround for...
...
How to get the currently logged in user's user id in Django?
...E_CLASSES setting.
The current user is in request object, you can get it by:
def sample_view(request):
current_user = request.user
print current_user.id
request.user will give you a User object representing the currently logged-in user. If a user isn't currently logged in, request.user ...
Joining three tables using MySQL
...N bridge b ON s.id = b.sid
INNER JOIN course c ON b.cid = c.id
ORDER BY s.name
share
|
improve this answer
|
follow
|
...