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What's the difference between comma separated joins and join on syntax in MySQL? [duplicate]
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The SELECT * FROM table1, table2, etc. is good for a couple of tables, but it becomes exponentially harder as the number of tables increases.
The JOIN syntax makes it explicit what criteria affects which tables (giving a condition). Also, the second way is...
How can I check if multiplying two numbers in Java will cause an overflow?
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Java 8 has Math.multiplyExact, Math.addExact etc. for ints and long. These throw an unchecked ArithmeticException on overflow.
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The 'json' native gem requires installed build tools
...file to point it to the correct one, then continue with ruby dk.rb review, etc.
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git pushes with wrong user from terminal
...0 git bash: error: could not lock config file C:/Program Files/Git/mingw64/etc/gitconfig: Permission denied
– alex
Sep 30 '19 at 16:17
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sho...
How does a hash table work?
...e number from 0 to 29,999.
The filing clerks of that time had to quickly fetch and store client records for the working staff. The staff had decided that it would be more efficient to use a hashing methodology to store and retrieve their records.
To file a client record, filing clerks would use t...
How do I disable form fields using CSS?
...ct using CSS.
pointer-events:none;
You might also want to change colors etc.
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How to use 'find' to search for files created on a specific date? [closed]
... could do this:
find ./ -type f -ls |grep '10 Sep'
Example:
[root@pbx etc]# find /var/ -type f -ls | grep "Dec 24"
791235 4 -rw-r--r-- 1 root root 29 Dec 24 03:24 /var/lib/prelink/full
798227 288 -rw-r--r-- 1 root root 292323 Dec 24 23:53 /var/log/sa/sar24
797244...
How do I get the width and height of a HTML5 canvas?
... ' x ' +
canvasElem.scrollHeight
var canvasContext = canvasElem.getContext('2d');
document.querySelector('#internal-dims').innerHTML = 'Canvas internal width x height: ' +
canvasContext.canvas.width +
' x ' +
canvasContext.canvas.height;
canvasContext.fillStyle = "...
What is the proper way to format a multi-line dict in Python?
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I use #3. Same for long lists, tuples, etc. It doesn't require adding any extra spaces beyond the indentations. As always, be consistent.
mydict = {
"key1": 1,
"key2": 2,
"key3": 3,
}
mylist = [
(1, 'hello'),
(2, 'world'),
]
nested = {
a...
Copy and paste content from one file to another file in vi
...e Vim windows or between Vim and PC applications (Notepad, Microsoft Word, etc.).
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