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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
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371
psql's inline help:
\h ALTER TABLE
Also documented in the postgres docs (an excellent resou...
How can I make a JUnit Test wait?
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edited Jul 29 '13 at 2:11
answered Apr 10 '13 at 23:54
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Matplotlib 2 Subplots, 1 Colorbar
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329
Just place the colorbar in its own axis and use subplots_adjust to make room for it.
As a qui...
The quest for the Excel custom function tooltip
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How to configure an existing git repo to be shared by a UNIX group
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Trevor Boyd Smith
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answered Jul 13 '10 at 23:34
David UnderhillDav...
Profiling Vim startup time
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edited Dec 1 '11 at 16:03
jeroen
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answered Nov 9...
mongodb find by multiple array items
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edited May 23 '16 at 17:30
AbdelHady
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Get the first element of each tuple in a list in Python [duplicate]
... for x in rows]
Below is a demonstration:
>>> rows = [(1, 2), (3, 4), (5, 6)]
>>> [x[0] for x in rows]
[1, 3, 5]
>>>
Alternately, you could use unpacking instead of x[0]:
res_list = [x for x,_ in rows]
Below is a demonstration:
>>> lst = [(1, 2), (3, 4)...
Android studio: new project vs new module
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edited Sep 17 '13 at 11:13
answered Jun 19 '13 at 9:37
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How to hash a password
...e use the recommendations from the https://stackoverflow.com/a/10402129/251311 instead.
You can either use
var md5 = new MD5CryptoServiceProvider();
var md5data = md5.ComputeHash(data);
or
var sha1 = new SHA1CryptoServiceProvider();
var sha1data = sha1.ComputeHash(data);
To get data as byte a...