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Can I add a UNIQUE constraint to a PostgreSQL table, after it's already created?
...ed to add one more unique constraint, you had to drop the entire constrain by:
ALTER TABLE your_table DROP CONSTRAINT constraint_name;
Make sure tha the new constraint you wanted to add is unique/ not null ( if its Microsoft Sql, it can contain only one null value) across all data on that table, ...
Difference in months between two dates
..., I spent years writing code for Acturaries. Some calculations were divide by number of days, round up by 30 to get monthly figure. Sometimes counting months assumed every date starts on the first of the month, count whole months accordingly. There is no best method when it comes to calculating date...
What is digest authentication?
...rname, realm, generate_md5_key(nonce, username, realm, URI, password_given_by_user_to_browser)) (yea, that's very simplified)
The server takes username and realm (plus it knows the URI the client is requesting) and it looks up the password for that username. Then it goes and does its own version of ...
How can I merge two commits into one if I already started rebase?
...nd c together:
(Note: Running git log pipes its output into a pager, less by default on most platforms. To quit the pager and return to your command prompt, press the q key.)
Running git rebase --interactive HEAD~2 gives you an editor with
pick b76d157 b
pick a931ac7 c
# Rebase df23917..a931ac7 ...
What is difference between sjlj vs dwarf vs seh?
... win32, the chain
of handlers are on stack and need to be saved/restored by real
executed code.
GCC GNU about Exception Handling:
GCC supports two methods for exception handling (EH):
DWARF-2 (DW2) EH, which requires the use of DWARF-2 (or DWARF-3) debugging information. DW-2 EH ca...
Passing ssh options to git clone
...
$GIT_SSH_COMMAND takes precedence over $GIT_SSH, and is
interpreted by the shell, which allows additional arguments to be
included.
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How to add a custom loglevel to Python's logging facility
...
@Eric S.
Eric S.'s answer is excellent, but I learned by experimentation that this will always cause messages logged at the new debug level to be printed -- regardless of what the log level is set to. So if you make a new level number of 9, if you call setLevel(50), the lower le...
How to ignore files which are in repository?
...hp
If you just want to ignore it locally, you could also make it ignored by the git status:
git update-index --assume-unchanged config.php
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How to extract public key using OpenSSL?
... can see what's inside the public key file (generated as explained above), by doing this:-
openssl rsa -noout -text -inform PEM -in key.pub -pubin
or for the private key file, this:-
openssl rsa -noout -text -in key.private
which outputs as text on the console the actual components of the key ...
What does the smiley face “:)” mean in CSS?
... this page in the latest version of IE you have. Then go to developer mode by doing a F12. In Emulation section (ctrl+8) change document mode to 7 and see what happens.
The property used in the page is :)font-size: 50px;.
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