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Alter Table Add Column Syntax
I'm trying to programmatically add an identity column to a table Employees. Not sure what I'm doing wrong with my syntax.
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Difference between this and self in self-type annotations?
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All three forms are valid, and have the effect that B is assumed as the type of this in class A.
The first two variants
trait A { self: B => ... }
trait A { foo: B => ... }
introduce self (respectively, foo) as an alias for this in trait...
How do I get the coordinates of a mouse click on a canvas element?
...it into a text editor. Then save it as example.html and, finally, open the file with a browser.
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Is there any difference between a GUID and a UUID?
...hrown around, and I was wondering if there are any differences between a GUID and a UUID?
6 Answers
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Event handling for iOS - how hitTest:withEvent: and pointInside:withEvent: are related?
...ile most apple documents are very well written, I think ' Event Handling Guide for iOS ' is an exception. It's hard for me to clearly understand what's been described there.
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How to remove frame from matplotlib (pyplot.figure vs matplotlib.figure ) (frameon=False Problematic
..., ax]:
item.patch.set_visible(False)
with open('test.png', 'w') as outfile:
fig.canvas.print_png(outfile)
(Of course, you can't tell the difference on SO's white background, but everything is transparent...)
If you don't want to show anything other than the line, turn the axis off as w...
differences between 2 JUnit Assert classes
...it.framework.Assert and org.junit.Assert. It is, however, probably a good idea to stick to the org.junit.Assert class since it is newer , slightly rewritten and probably meant as a replacement.
– Glenn Bech
Nov 30 '15 at 9:51
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How do I convert an interval into a number of hours with postgres?
... SELECT EXTRACT(epoch FROM my_interval/3600) (interval has native 'divide integer' support, result is interval, and extract result is integer, not float). So. Autocast/Floor done.
– Offenso
Aug 12 '15 at 13:24
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How can I define a composite primary key in SQL?
...te primary key. It is defined as follows:
CREATE TABLE voting (
QuestionID NUMERIC,
MemberID NUMERIC,
PRIMARY KEY (QuestionID, MemberID)
);
The pair (QuestionID,MemberID) must then be unique for the table and neither value can be NULL. If you do a query like this:
SELECT * FROM voting WHER...
How can I read inputs as numbers?
...a number: "), 2)
Enter a number: 1234
Traceback (most recent call last):
File "<input>", line 1, in <module>
ValueError: invalid literal for int() with base 2: '1234'
For values that can have a fractional component, the type would be float rather than int:
x = float(input("Enter a n...