大约有 47,000 项符合查询结果（耗时：0.0487秒） [XML]
Two single-column indexes vs one two-column index in MySQL?
... the statement I provided.
Additionally, MySQL can only use one index per SELECT so a covering index would be the best means of optimizing your queries.
share
|
improve this answer
|
...
Remove empty space before cells in UITableView
...e first one.
Here's how to change this behavior:
a) Interface Builder
Select the view controller
Open Attributes inspector
There's a property called "Adjust scroll view insets" in IB's attribute inspector (when a view controller is selected) which is on by default. Uncheck this option:
(Image...
How to show SQL queries run in the Rails console?
...ecord::Relation’s to_sql method:
User.where(:id => 3).to_sql
#=> "SELECT \"users\".* FROM \"users\" WHERE \"users\".\"id\" = 3"
share
|
improve this answer
|
follo...
What are Unwind segues for and how do you use them?
...e want to unwind to Red from Green when the button is pressed:
You must select the action which is defined in the view controller you want to unwind to:
You can also unwind to Red from Blue (which is "two steps away" in the navigation stack). The key is selecting the correct unwind action.
Be...
How to build a Debian/Ubuntu package from source?
...edge might be out of date on this one, but to address both:
Use dpkg --set-selections. Assuming nullidentd was the package you wanted to stay put, run as root
echo 'nullidentd hold' | dpkg --set-selections
Alternately, since you are building from source, you can use an epoch to set the version n...
Manually put files to Android emulator SD card
... Card through the Android Perspective (it is called DDMS in Eclipse). Just select the Emulator in the left part of the screen and then choose the File Explorer tab. Above the list with your files should be two symbols, one with an arrow pointing at a phone, clicking this will allow you to choose a f...
ASP MVC in IIS 7 results in: HTTP Error 403.14 - Forbidden
...ommand prompt as an Administrator (right click the command prompt icon and select Run as Administrator):
cd \
cd Windows\Microsoft.NET\Framework\v4.xxx.xxx
aspnet_regiis -i
Once it has installed and registered, make sure you application is using an application pool that is set to .NET 4.0.
UPDAT...
Select elements by attribute
...
Do you mean can you select them? If so, then yes:
$(":checkbox[myattr]")
share
|
improve this answer
|
follow
...
Getting Chrome to accept self-signed localhost certificate
...", then also find it in the list, right click it, expand "> Trust", and select "Always"
Add extendedKeyUsage=serverAuth,clientAuth below basicConstraints=CA:FALSE, and make sure you set the "CommonName" to the same as $NAME when it's asking for setup
You can check your work
openssl verify -CAfil...
Any tips on how to organize Eclipse environment on multiple monitors?
...s don't "communicate", e.g. javadoc view in one window won't be updated by selections in the other, similarly jUnit.
– David
Nov 2 '11 at 15:01
...