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PostgreSQL: How to pass parameters from command line?
...and then refer to the variables in sql as :v1, :v2 etc
select * from table_1 where id = :v1;
Please pay attention on how we pass string/date value using two quotes " '...' "
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Is there a null-coalescing (Elvis) operator or safe navigation operator in javascript?
...swered Jun 17 '16 at 15:20
James_picJames_pic
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Is git good with binary files?
...{FfMCvb5IaiQM`NJfeQjFwttKJyJNq@
hveI=@x=fAo=hV3$-MIWu9%vGSr>mdKI;RB2CICA_GnfDX
You can use textconv gitattribute to have git diff show human-readable diff for binary files, or parts of binary files. For example for *.jpg files it can be difference in EXIF information, for PDF files it can be di...
Callback functions in Java
... answered Nov 6 '14 at 10:02
Juh_Juh_
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Can I set an opacity only to the background image of a div?
...e: linear-gradient(rgba(255,255,255,0.5), rgba(255,255,255,0.5)), url("your_image.png");
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OS detecting makefile
...was adding OS/CPU auto-detection happened to be using.
ifeq ($(OS),Windows_NT)
CCFLAGS += -D WIN32
ifeq ($(PROCESSOR_ARCHITEW6432),AMD64)
CCFLAGS += -D AMD64
else
ifeq ($(PROCESSOR_ARCHITECTURE),AMD64)
CCFLAGS += -D AMD64
endif
ifeq ($(PROCESS...
How does C compute sin() and other math functions?
...r than the fsin assembly instruction. Source code: sysdeps/ieee754/dbl-64/s_sin.c, look for __sin (double x).
This code is very complex. No one software algorithm is as fast as possible and also accurate over the whole range of x values, so the library implements several different algorithms, and i...
SQLAlchemy: how to filter date field?
... for >= and vice versa:
qry = DBSession.query(User).filter(
and_(User.birthday <= '1988-01-17', User.birthday >= '1985-01-17'))
# or same:
qry = DBSession.query(User).filter(User.birthday <= '1988-01-17').\
filter(User.birthday >= '1985-01-17')
Also you can use betw...
MongoDB not equal to
...thor : 'you', post: "how to query"})
db.test.find({'post': {$ne : ""}})
{ "_id" : ObjectId("4f68b1a7768972d396fe2268"), "author" : "you", "post" : "how to query" }
And now $not, which takes in predicate ($ne) and negates it ($not):
db.test.find({'post': {$not: {$ne : ""}}})
{ "_id" : ObjectId("4f...
Why isn't `int pow(int base, int exponent)` in the standard C++ libraries?
...way to do an operation" as a constraint. Rightly so, because for example to_string and lambdas are both conveniences for things you could do already. I suppose one could interpret "only one way to do an operation" very loosely to allow both of those, and at the same time to allow almost any duplicat...