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Delete with Join in MySQL
... to:
DELETE posts, projects FROM posts INNER JOIN [...]
Note that order by and limit don't work for multi-table deletes.
Also be aware that if you declare an alias for a table, you must use the alias when referring to the table:
DELETE p FROM posts as p INNER JOIN [...]
Contributions from C...
Passport.js - Error: failed to serialize user into session
...t would depend on how you implement serialization. Sometimes you serialize by user id, which means that the serializeUser function stores just the user id in the session, and deserializeUser uses that id to retrieve the user data from a database (for instance). This is to prevent the session storage...
How do I iterate over an NSArray?
... (obtained via a single method call) in a buffer and iterates through them by advancing through the buffer using pointer arithmetic. This is much faster than calling -objectAtIndex: each time through the loop.
It's also worth noting that while you technically can use a for-in loop to step through a...
Alternate output format for psql
...nt at the command line? It'd be nice if I could just save (for instance, by using a bash shell alias) psql --something so that I always have the option turned on by default.
– machineghost
Apr 1 '18 at 0:16
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SQL “select where not in subquery” returns no results
...e efficient, since LEFT JOIN / IS NULL cannot be optimized to an ANTI JOIN by its optimizer.
In PostgreSQL, LEFT JOIN / IS NULL and NOT EXISTS are more efficient than NOT IN, sine they are optimized to an Anti Join, while NOT IN uses hashed subplan (or even a plain subplan if the subquery is too la...
Execute Insert command and return inserted Id in Sql
...
this shows an error "InValidCast Exception was unhandled by user code"
– neel
Aug 22 '13 at 7:04
2
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Get element inside element by class and ID - JavaScript
...Well, first you need to select the elements with a function like getElementById.
var targetDiv = document.getElementById("foo").getElementsByClassName("bar")[0];
getElementById only returns one node, but getElementsByClassName returns a node list. Since there is only one element with that class ...
Implementing Comments and Likes in database
.... and I wonder how Django ORM will handle to map it (or how I will do that by myself...but, that is the other problem ;) ) But, can you explain me, cause I think I do not understand it properly - what you have drawn for me (thanks!) is the third approach you mentioned?
– Kokos...
Using querySelector with IDs that are numbers
...It is valid, but requires some special handling. From here: http://mathiasbynens.be/notes/css-escapes
Leading digits
If the first character of an identifier is numeric, you’ll need to escape it based on its Unicode code point. For example, the code point for the character 1 is U+0031, so...
Selecting element by data attribute
...m data attributes plugin. This allows you to write even more readable code by using .dataAttr('foo'), and results in a smaller file size after minification (compared to using .attr('data-foo')).
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