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Why is i++ not atomic?
...s the ll and sc: load-linked, and store-conditional. Load-linked reads the word, and store-conditional stores the new value if the word has not changed, or else it fails (which is detected and causes a re-try).
share
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How to make a chain of function decorators?
...important consequences. Let’s see why with a simple example :
def shout(word="yes"):
return word.capitalize()+"!"
print(shout())
# outputs : 'Yes!'
# As an object, you can assign the function to a variable like any other object
scream = shout
# Notice we don't use parentheses: we are not ...
PostgreSQL naming conventions
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Regarding tables names, case, etc, the prevalent convention is:
SQL keywords: UPPER CASE
names (identifiers): lower_case_with_underscores
For example:
UPDATE my_table SET name = 5;
This is not written in stone, but the bit about identifiers in lower case is highly recommended, IMO. Postgres...
How to remove line breaks from a file in Java?
...t.replace("\r\n", " ").replace("\n", " "); is a better solution: otherwise words will be "glued" to each other (without the single-space replacement).
– Bart Kiers
Jan 29 '10 at 15:54
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What's the difference between a catalog and a schema in a relational database?
...ppings (external/conceptual, conceptual/internal) are kept.
In other words, the catalog contains detailed information (sometimes called descriptor information or metadata) regarding the various objects that are of interest to the system itself.
For example, the optimizer uses catalog info...
Vim: faster way to select blocks of text in visual mode
...select the range of text matching your search; i.e: find and select (whole word) your search term?
– Daniel Park
Oct 30 '13 at 21:54
5
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What is cardinality in MySQL?
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What's with this fetish for big words. "Distinctness" would work fine isn't it?
– Pacerier
Feb 1 '15 at 23:14
9
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round() for float in C++
...n:
float roundf(x)
{
int signbit;
__uint32_t w;
/* Most significant word, least significant word. */
int exponent_less_127;
GET_FLOAT_WORD(w, x);
/* Extract sign bit. */
signbit = w & 0x80000000;
/* Extract exponent field. */
exponent_less_127 = (int)((w & 0x7f800000) &...
Checking if a field contains a string
...dex can be large. It contains one index entry for each unique post-stemmed word in each indexed field for each document inserted.
A text index will take longer to build than a normal index.
A text index does not store phrases or information about the proximity of words in the documents. As a result,...
Insert into a MySQL table or update if exists
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"transgress" is not the word you're looking for :) Unfortunately, now I've seen "transgress", I can no longer visualise the actual word..
– mwfearnley
Apr 13 '17 at 7:47
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