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Copy values from one column to another in the same table
... set str = '';
WHILE x < 5 DO
set str = (select source_col from emp where id=x);
update emp set target_col =str where id=x;
SET x = x + 1;
END WHILE;
END$$
DELIMITER ;
...
What is the difference between “expose” and “publish” in Docker?
...col are optional, if not a public port is specified, a random port will be selected on host by docker to expose the specified container port on Dockerfile.
A good pratice is do not specify public port, because it limits only one container per host ( a second container will throw a port already in u...
Java Naming Convention with Acronyms [closed]
....e. with DvdPlayer you can type "DP" and press Ctrl+1 to get the choice to select DvdPlayer, but if you had DVDPlayer you would have to type "DVDP". And is even more annoying if it is longer. I wouldn't like to have an UNESCOConnector in my code. Anyway it is a matter of choice.
...
Margin while printing html page
... wrong even if you use cm or mm. To override this behaviour, the user must select 'Print preview' and then set the print size to 100% (default is Shrink To Fit).
A better option for full control on printed margins is to use the @page directive to set the paper margin, which will affect the margin ...
Why does Java's hashCode() in String use 31 as a multiplier?
... for 31 since 33 is not a prime:
Of the remaining
four, I'd probably select P(31), as it's the cheapest to calculate on a RISC
machine (because 31 is the difference of two powers of two). P(33) is
similarly cheap to calculate, but it's performance is marginally worse, and
33 is composit...
Use JavaScript to place cursor at end of text in text input element
...
There's a simple way to get it working in most browsers.
this.selectionStart = this.selectionEnd = this.value.length;
However, due to the *quirks of a few browsers, a more inclusive answer looks more like this
setTimeout(function(){ that.selectionStart = that.selectionEnd = 10000; },...
How do I implement onchange of with jQuery?
<select> has this API. What about <input> ?
14 Answers
14
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How do I retrieve my MySQL username and password?
...art the MySQL console client with the -u root option.
List all the users;
SELECT * FROM mysql.user;
Reset password;
UPDATE mysql.user SET Password=PASSWORD('[password]') WHERE User='[username]';
But DO NOT FORGET to
Stop the MySQL process
Start the MySQL Process normally (i.e. without the --ski...
moving committed (but not pushed) changes to a new branch after pull
...- is desirable branch
git fetch && git checkout branch1
git log
select commit ids that you need to move
git fetch && git checkout branch2
git cherry-pick commit_id_first..commit_id_last
git push
Now revert unpushed commits from initial branch
git fetch && git checkout ...
Parsing JSON with Unix tools
...s is format the JSON, if I'm not mistaken. It does not allow the caller to select a particular field from the output, as would an xpath solution, or something based on "JSON Pointer".
– Cheeso
Jun 4 '14 at 0:42
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