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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
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select <column> from <table> group by 1 having count(*) > 1; will give a report on duplicated values.
– Jasen
Aug 26 '16 at 22:57
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Live character count for EditText
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tried this, works great! should be selected as correct answer!
– Patrick Boos
Jan 3 '11 at 5:10
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horizontal scrollbar on top and bottom of table
...nate bug: clicking the shaded area of the scrollbar no longer jumps to the selection you click. Instead, what you get is a very small and somewhat annoying increment in the position of the scrollbar.
Tested: 4 versions of Firefox (100% affected), 4 versions of Chrome (50% affected).
Here's my jsf...
Swift alert view with OK and Cancel: which button tapped?
... in Xcode written in Swift and I'd like to determine which button the user selected (it is a confirmation dialog) to do nothing or to execute something.
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The differences between .build, .create, and .create! and when should they be used?
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I'm selected this one as the most correct answer because of the mention on being able to link the associated models with them - that's an interesting and important difference I think over using .new and .save. Which takes a littl...
Array slicing in Ruby: explanation for illogical behaviour (taken from Rubykoans.com)
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Read the slice syntax array[x,y] as "starting after x elements in array, select up to y elements". This is only meaningful if array has at least x elements.
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Showing Travis build status in GitHub repo
...me or org}/{repository}
Click the Status Image (a pop-up will appear)
Select a branch, then click the dropdown Image URL ▼ and set it to Markdown ▼.
Copy Paste the code to your README.md
Git add, commit & push. Refresh Github and you'll see the image now.
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LEGO EV3 机器人传感器面板 · App Inventor 2 中文网
...ListPicker1.AfterPicking 时
调用 BluetoothClient1.Connect(ListPicker1.Selection)
如果 BluetoothClient1.IsConnected 那么
设置 Clock1.TimerEnabled 为 true
设置 Screen1.Title 为 "Connected"
步骤2：传感器轮询
Clock.Timer 事件每 200ms 触发...
Design Patterns: Factory vs Factory method vs Abstract Factory
...vide hotels or / and provide tourist attraction packages. Now, when a user selects next, the website needs to decide what objects it needs to create. Should it only create the travel or hotel object too.
Now, if you envision adding another website to your portfolio, and you believe that the same co...
AutoMapper vs ValueInjecter [closed]
...o in case you need it with ValueInjecter you just do something like:
foos.Select(o => new Bar().InjectFrom(o));
you can also use ValueInjecter to map from anonymous and dynamic objects
differences:
automapper create configuration for each mapping possibility CreateMap()
valueinjecter inject ...