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How to DROP multiple columns with a single ALTER TABLE statement in SQL Server?
...P COLUMN column_name1, DROP COLUMN column_name2;
Be aware
DROP COLUMN does not physically remove the data for some DBMS. E.g. for MS SQL. For fixed length types (int, numeric, float, datetime, uniqueidentifier etc) the space is consumed even for records added after the columns were dropped. To ...
Find a private field with Reflection?
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You can do it just like with a property:
FieldInfo fi = typeof(Foo).GetField("_bar", BindingFlags.NonPublic | BindingFlags.Instance);
if (fi.GetCustomAttributes(typeof(SomeAttribute)) != null)
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How to display a confirmation dialog when clicking an link?
...ally you would like to separate your HTML and Javascript, so I suggest you don't use inline event handlers, but put a class on your link and add an event listener to it.
<a href="delete.php?id=22" class="confirmation">Link</a>
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<script type="text/javascript">
var elems = do...
How do I change the formatting of numbers on an axis with ggplot?
...sity/arbitrary units", labels = comma)
to your ggplot statement.
If you don't want to load the package, use:
scale_y_continuous(name="Fluorescent intensity/arbitrary units", labels = scales::comma)
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Echo equivalent in PowerShell for script testing
....e. overriding the preference variables) as compiled cmdlets and providers do.
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Converting Integer to Long
... depends on what the method's actually returning. That wouldn't work for a double[] for example, but would work for a Double[].
– Jon Skeet
Jul 14 '11 at 9:40
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cv2.imshow command doesn't work properly in opencv-python
I'm using opencv 2.4.2, python 2.7
The following simple code created a window of the correct name, but its content is just blank and doesn't show the image:
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Assign variable value inside if-statement [duplicate]
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@rmalchow Correction, you don't necessarily have to initialize variable, it depends on what if statement does. If it returns out, for instance, then there is no need for initialization.
– randomUser56789
Jul 30 '...
How can I call controller/view helper methods from the console in Ruby on Rails?
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Note in Rails 3.2 this does not work. I needed to call url_for from the console. To do this I did app.url_for(...)
– Raphael
Jul 5 '13 at 16:18
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What are the precise rules for when you can omit parenthesis, dots, braces, = (functions), etc.?
What are the precise rules for when you can omit (omit) parentheses, dots, braces, = (functions), etc.?
6 Answers
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