大约有 47,000 项符合查询结果（耗时：0.0215秒） [XML]
Adding an identity to an existing column
...column of a of a 2.5 billion row table from IDENTITY to a non-IDENTITY (in order to run a multi-hour query whose query plan worked better for non-IDENTITY columns), and then restored the IDENTITY setting, again in less than 5 seconds.
Here's a code sample of how it works.
CREATE TABLE Test
(
...
Closing Database Connections in Java
...nnection, you need to explicitly close it by calling its close() method in order to release any other database resources (cursors, handles, etc) the connection may be holding on to.
Actually, the safe pattern in Java is to close your ResultSet, Statement, and Connection (in that order) in a finall...
Explanation of the UML arrows
...ice reference but to me a Menu -> MenuItem has the same relation like a Order -> OrderItem so both of them are Compositions.
– Ignacio Soler Garcia
Jun 28 '13 at 10:53
4
...
How to simulate Android killing my process
...tyB onCreate WITHOUT savedInstance
ActivityB onStart
ActivityA onStop (the order is like this, it is stopped after new one is started)
<go settings>
ActivityB onStop
<disable a permission>
//Application is killed, but onDestroy methods are not called.
//Android does not call onDestroy me...
Understanding Canvas and Surface concepts
... and Surface Flinger renders these to the final display in their correct Z-order. A surface typically has more than one buffer (usually two) to do double-buffered rendering: the application can be drawing its next UI state while the surface flinger is compositing the screen using the last buffer, w...
SQL Server: Difference between PARTITION BY and GROUP BY
... group by modifies the entire query, like:
select customerId, count(*) as orderCount
from Orders
group by customerId
But partition by just works on a window function, like row_number:
select row_number() over (partition by customerId order by orderId)
as OrderNumberForThisCustomer
from Order...
How to append contents of multiple files into one file
... Keep in mind that you are losing the possibility to maintain merge order though. This may affect you if you have your files named, eg. file_1, file_2, … file_11, because of the natural order how files are sorted.
– emix
Nov 19 '19 at 13:42
...
Compare two files line by line and generate the difference in another file
...
What does "sorted" mean? That the lines have the same order? Then it's probably fine for most use cases - as in, checking for what lines have been added by comparing with a backed-up older version. If newly added lines cannot be between the existing lines, that's more of an issu...
Is there a CSS selector for elements containing certain text?
...s it working just 'cos male is first? Bug waiting to happen if they are re-ordered?
– Michael Durrant
Mar 26 '16 at 22:56
...
Biggest GWT Pitfalls? [closed]
...s your data back and forth via the RPC mechanism.
Problem: Sometimes in order to populate your GWT page, you need to make a server call when the page first loads. It can be annoying for the user to sit there and watch a loading symbol while you fetch the data you need.
Solution: In the case of a...