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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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How do I join two lines in vi?
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If you want to join the selected lines (you are in visual mode), then just press gJ to join your lines with no spaces whatsoever.
This is described in greater detail on the vi/Vim Stack Exchange site.
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Add a CSS class to
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Despite having fewer votes than the selected answer, this is the solution most people will want to use.
– IAmNaN
Nov 12 '13 at 19:41
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How to handle dependency injection in a WPF/MVVM application
...would switch from one view to another within this region, e.g. as the user selects menu items or whatever.
Alternatively take a look at one of the MVVM frameworks such as MVVM Light. I've got no experience of these so can't comment on what they're like to use.
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How do I install the yaml package for Python?
...that is an explanation for the problem, not a method to solve the issue of selecting an appropriate package sadly. Would be v happy for suggestions of what to incorporate in the answer
– Bonlenfum
Jun 22 at 10:25
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nullable object must have a value
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When using LINQ extension methods (e.g. Select, Where), the lambda function might be converted to SQL that might not behave identically to your C# code. For instance, C#'s short-circuit evaluated && and || are converted to SQL's eager AND and OR. This can c...
Maven skip tests
...ry fine for me:
Click on the "Skip Test" button
Hold the "CTRL" button
Select "clean" and "install"
Click on the "Run" button in the maven pannel
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How to get a pixel's x,y coordinate color from an image?
Is there any way to check if a selected(x,y) point of a PNG image is transparent?
4 Answers
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Check/Uncheck checkbox with JavaScript (jQuery or vanilla)?
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You really don't need the array index if you are only selecting one element. But I guess if you want to be explicit. haha
– Rizowski
Apr 22 '15 at 18:46
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The Use of Multiple JFrames: Good or Bad Practice? [closed]
...emo.). Good for:
Showing wizard like dialogs.
Displaying list, tree etc. selections for items that have an associated component.
Flipping between no component and visible component.
JInternalFrame/JDesktopPane typically used for an MDI.
JTabbedPane for groups of components.
JSplitPane A way to di...