大约有 46,000 项符合查询结果（耗时：0.0487秒） [XML]
IN vs OR in the SQL WHERE Clause
... your specific data to see which is faster.
I tried both on a MySQL with 1000000 rows. When the column is indexed there is no discernable difference in performance - both are nearly instant. When the column is not indexed I got these results:
SELECT COUNT(*) FROM t_inner WHERE val IN (1000, 2000, ...
Command to change the default home directory of a user
...
|
edited Mar 20 at 17:04
fnkr
6,31366 gold badges3939 silver badges5353 bronze badges
answer...
Why doesn't Haskell's Prelude.read return a Maybe?
...
108
Edit: As of GHC 7.6, readMaybe is available in the Text.Read module in the base package, along ...
How to style UITextview to like Rounded Rect text field?
...
20 Answers
20
Active
...
Notification when a file changes?
...
answered Apr 6 '09 at 14:34
Mihai LimbășanMihai Limbășan
54.5k44 gold badges4646 silver badges5858 bronze badges
...
When annotating a class with @Component, does this mean it is a Spring Bean and Singleton?
...
rogerdpack
46.3k3030 gold badges200200 silver badges315315 bronze badges
answered May 6 '11 at 6:18
BozhoBozho
...
How to find children of nodes using BeautifulSoup
...stChild()
– tej.tan
Jun 9 '11 at 3:20
...
Preventing Laravel adding multiple records to a pivot table
...te/…
– Rob Gordijn
Jul 5 '13 at 8:08
...
How can I expand the full path of the current file to pass to a command in Vim?
...
answered Feb 10 '10 at 1:59
Annika BackstromAnnika Backstrom
13.1k55 gold badges3838 silver badges5252 bronze badges
...
Difference between web reference and service reference?
...
102
The low-level answer here is that a Web Reference will create a client proxy class that allows ...