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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
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How to correctly use “section” tag in HTML5?
...ion. A section, in this context, is a thematic grouping of
content, typically with a heading.
Examples of sections would be chapters, the various tabbed pages in a
tabbed dialog box, or the numbered sections of a thesis. A Web site's
home page could be split into sections for an introduct...
Get ffmpeg information in friendly way
...eed to tell ffprobe what information you want it to display (with the -show_format, -show_packets and -show_streams options) or it'll just give you blank output (like you mention in one of your comments).
For example, ffprobe -v quiet -print_format json -show_format -show_streams somefile.asf would...
recursion versus iteration
...where recursion is used a for loop could be used? And if recursion is usually slower what is the technical reason for ever using it over for loop iteration?
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What is the correct MIME type to use for an RSS feed?
...tart using it". Today: see my answer below for evidence that pretty much all popular feeds use text/xml.
– Kai Carver
Apr 19 '16 at 3:54
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Rolling back a remote Git repository
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You can use git revert <commit>… for all the n commits, and then push as usual, keeping history unchanged.
Or you can "roll back" with git reset --hard HEAD~n. If you are pushing in a public or shared repository, you may diverge and break others work based on y...
Getting the IP address of the current machine using Java
... has the following effect: it sets the destination for Send/Recv, discards all packets from other addresses, and - which is what we use - transfers the socket into "connected" state, settings its appropriate fields. This includes checking the existence of the route to the destination according to th...
Select all elements with “data-” attribute without using jQuery
Using only JavaScript, what is the most efficient way to select all DOM elements that have a certain data- attribute (let's say data-foo ). The elements may be different tag elements.
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How to remove unreferenced blobs from my git repo
...and without further ado, may I present to you this useful command, "git-gc-all", guaranteed to remove all your git garbage until they might come up extra config variables:
git -c gc.reflogExpire=0 -c gc.reflogExpireUnreachable=0 -c gc.rerereresolved=0 -c gc.rerereunresolved=0 -c gc.pruneExpire=now ...
How to create a string with format?
I need to create a string with format which can convert int, long, double etc. types into string. Using Obj-C, I can do it via below way.
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