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Delete sql rows where IDs do not have a match from another table
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Using LEFT JOIN/IS NULL:
DELETE b FROM BLOB b
LEFT JOIN FILES f ON f.id = b.fileid
WHERE f.id IS NULL
Using NOT EXISTS:
DELETE FROM BLOB
WHERE NOT EXISTS(SELECT NULL
FROM FILES f
WHERE f.id = fileid)
Using NOT IN:
DELETE FROM B...
Where to place private methods in Ruby?
...etails and should be the last thing the reader sees so belong lower in the file. I agree with the above comment that this won't work well with larger files. This should not be the accepted answer, there's so much better advice on this page.
– Luke Cowell
May 1...
tmux set -g mouse-mode on doesn't work
...ch turns on mouse support
So this is what I'm using now in my .tmux.conf file
set -g mouse on
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Is pass-by-value a reasonable default in C++11?
...ou're allowed to pass null pointers, if the function will take ownsership, etc. IMHO, a pointer parameter conveys much less informations than a non-const reference. I agree however that it would be nice to have a visual clue at the call site that the argument may be modified (like the ref keyword in...
Disable single warning error
Is there a way to disable just a single warning line in a cpp file with visual studio?
11 Answers
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How To Save Canvas As An Image With canvas.toDataURL()?
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Except in IE9 standards mode: "Some content or files on this webpage require a program that you don't have installed." Internet Explorer 8 and above only supports data URIs for images in CSS, <link>, and <img>: developer.mozilla.org/en-US/docs/data_URIs
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Python locale error: unsupported locale setting
...le(locale.LC_ALL, 'it_IT') # error!
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/usr/lib/python2.7/locale.py", line 539, in setlocale
return _setlocale(category, locale)
locale.Error: unsupported locale setting
>>> locale.setlocale(loca...
Passing command line arguments from Maven as properties in pom.xml
...it possible to pass arguments from command line to properties in pom.xml file ?
for example I run mvn ... argument
5 Ans...
Check if image exists on server using JavaScript?
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But shouldn't function name be fileExists because this works on .js .css .html or any other publicly available file.
– CoR
Jun 11 '15 at 14:56
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How to set HTTP header to UTF-8 using PHP which is valid in W3C validator?
...f your executing php, to do it for static pages, you should save your html file AS utf-8. Doing so will add the BOM character utf-8 encoded to the beginning of the file. bytes 0xEF, 0xBB, 0xBF added to the beginning of the file. Most web servers will notice this and apply the appropriate header. ...