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Using DISTINCT and COUNT together in a MySQL Query
...ted the answer as it is close to become a great answer and it was syntactically incorrect.
– Rahul Tripathi
Sep 8 '14 at 10:20
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What's the use of do while(0) when we define a macro? [duplicate]
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As Amo said, it's a clever trick that allows a macro to be a C statement that must end with a semicolon. It makes the macro act exactly like a function call, so far as statement construction and termination (with ';') is concerned.
– Eddie
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Save PL/pgSQL output from PostgreSQL to a CSV file
...e to your local PC. It also needs to be run as a Postgres "superuser" (normally called "root") because Postgres can't stop it doing nasty things with that machine's local filesystem.
That doesn't actually mean you have to be connected as a superuser (automating that would be a security risk of a di...
How to write a simple database engine [closed]
...ny, so I am hoping someone else can point me in the right direction. Basically, I would like information on the following:
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If list index exists, do X
... that relative index from the end of the list...
However, by definition, all items in a Python list between 0 and len(the_list)-1 exist (i.e., there is no need for a try, except if you know 0 <= index < len(the_list)).
You can use enumerate if you want the indexes between 0 and the last el...
How to get UTC time in Python?
...poses when you need to calculate an amount of time spent between two dates all that you need is to substract end and start dates. The results of such substraction is a timedelta object.
From the python docs:
class datetime.timedelta([days[, seconds[, microseconds[, milliseconds[, minutes[, hours[,...
Rename Pandas DataFrame Index
...ust a gentle reminder that without "inplace =True", df1.rename would not really change anything.
– Sarah
Sep 29 '19 at 15:35
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Android: Access child views from a ListView
... adapter. It might not be fully visible (and might not even be visible at all, depending on ListView's threshold of "visibility" before recycling a view that it considers is "scrolled out of view")
– Joe
Oct 31 '13 at 16:33
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Git Tag list, display commit sha1 hashes
...t'll show the hash of the tag object itself.
– Lily Ballard
Jan 9 '12 at 23:43
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How to increase the Java stack size?
I asked this question to get to know how to increase the runtime call stack size in the JVM. I've got an answer to this, and I've also got many useful answers and comments relevant to how Java handles the situation where a large runtime stack is needed. I've extended my question with the summary of ...