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What are '$$' used for in PL/pgSQL
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137
The dollar signs are used for dollar quoting and are in no way specific to function definitions...
What is causing ERROR: there is no unique constraint matching given keys for referenced table?
... Vlastimil Ovčáčík
1,8412121 silver badges2727 bronze badges
answered Aug 15 '12 at 9:00
DiegoDiego
29.9k1717 gold badges...
Why does Go have a “goto” statement
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78
When we actually check the source code of the Go standard library, we can see where gotos are a...
Java Map equivalent in C#
...f Dictionary<TKey, TValue>'s MSDN page
– canton7
Sep 26 '14 at 10:35
add a comment
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Append class if condition is true in Haml
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74
just a side note for multiple conditions ` {class: [('class1' unless condition1), ('class2' if condition2)]} ` .. etc
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SQLAlchemy: how to filter date field?
...= 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 between:
qry = DBSession.query(User...
MongoDB not equal to
... 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("4f68b19c768972d396fe2267")...
Generate a UUID on iOS from Swift
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answered Jun 26 '14 at 10:47
Ahmed Al HafoudhAhmed Al Hafoudh
7,62611 gold badge1414 silver badges3131 bronze badges
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Python module os.chmod(file, 664) does not change the permission to rw-rw-r— but -w--wx----
... Thanks, but I am still confused that, 484 in decimal means 744 in octal, which makes sense in the thread you mentioned in the forum. However, if I give 644 in decimal, it goes to 1204 in octal. How does 1204 relate to 230 in octal?
– AplusG
Mar ...