大约有 40,000 项符合查询结果（耗时：0.0587秒） [XML]
Entity Framework: table without primary key
... Changing the code to satisfy EF is a workaround in itself. Not all tables need a primary key nor they should be forced to. E.g. you've a Topic and it has 0 or many keywords. The keywords table can have a parent topic id and a corresponding keyword. TO say that I need to remodel my DB bec...
Difference between doseq and for in Clojure
...e's answer is
(for [x [1 2 3]] (println x))
At the REPL, this will generally do what you want, but that's basically a coincidence: the REPL forces the lazy sequence produced by for, causing the printlns to happen. In a non-interactive environment, nothing will ever be printed. You can see this in...
Difference between FOR and AFTER triggers?
...
AFTER specifies that the DML trigger is fired only when all operations specified in the triggering SQL statement have executed successfully. All referential cascade actions and constraint checks also must succeed before this trigger fires.
AFTER is the default when FOR is the onl...
Difference between declaring variables before or in loop?
...asure this.
I would code it the A way as well but I would say it doesn't really matter.
share
|
improve this answer
|
follow
|
...
Android - Pulling SQlite database android device
... pro tip: this backup stuff won't work if the app's manifest shows android:allowBackup="false"
– Someone Somewhere
May 27 '14 at 1:23
9
...
Difference between hard wrap and soft wrap?
...u come back later and edit/add/remove words later on. (You can do this manually in emacs with M-q.)
This is rather annoying, since obsessive compulsive people like me then go back and have to manually re-insert the hard breaks at the appropriate points.
On the other hand, soft wrapping is annoyin...
What is the difference between lower bound and tight bound?
...
In simple terms can we call: upper bound (Big(O)) as the worst case? tight bound as the average case? lower bound (Omega) as the best case?
– Revanth
Mar 12 '18 at 22:30
...
Which is faster: multiple single INSERTs or one multiple-row INSERT?
... How many rows i can insert at a time using single insert statement. is it allow me to insert 10000 rows at a time?
– Naresh Ramoliya
Apr 30 '16 at 8:02
10
...
Friend declaration in C++ - difference between public and private
...nd of class A and now can access its private and protected members, that's all.
share
|
improve this answer
|
follow
|
...
R - Markdown avoiding package loading messages
...e chunk option results be split into results, hold, and markup which would all be boolean values. Alas, this is not how it works.
– Head
Mar 17 '15 at 16:55
2
...