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How do you use script variables in psql?
...ugh the \set command, for example ...
\set myvariable value
... and can then be substituted, for example, as ...
SELECT * FROM :myvariable.table1;
... or ...
SELECT * FROM table1 WHERE :myvariable IS NULL;
edit: As of psql 9.1, variables can be expanded in quotes as in:
\set myvariable v...
Get Insert Statement for existing row in MySQL
...single-table query as a list of INSERT statements. Just run the query, and then:
click on the floppy disk near Export/Import above the results
give the target file a name
at the bottom of the window, for Format select SQL INSERT statements
click Save
click Export
...
iTerm 2: How to set keyboard shortcuts to jump to beginning/end of line?
...n just the characters to the left of the curser. I personally use this and then overwrite my zsh bindkey for ^U to delete only stuff to the left of the cursor (see below).
or
0x18 0x7f Less compatible, doesn't work in node and won't work in zsh by default, see below to fix zsh (bash/irb/pry should b...
GetHashCode Guidelines in C#
...ample, object A returns hash of 1. So, it goes in bin 1 of the hash table. Then you change object A such that it returns a hash of 2. When a hash table goes looking for it, it looks in bin 2 and can't find it - the object is orphaned in bin 1. This is why the hash code must not change for the lifet...
How to explain dependency injection to a 5-year-old? [closed]
...ld be doing is stating a need, "I need something to drink with lunch," and then we will make sure you have something when you sit down to eat.
share
edited Feb 2 '15 at 19:19...
Clear variable in python
...u try to print an undefined variable. But if you define the variable, and then try to clear it with None, using the print x code will produce the word None as output. I'm new to python so I could be mistaken, but this does not seem like the behavior of a cleared variable.
– Mu...
Uninstalling Android ADT
...t ADT > Installation Details.
Select a plug-in you want to uninstall, then click Uninstall... button at the bottom.
If you cannot remove ADT from this location, then your best option is probably to start fresh with a clean Eclipse install.
...
Flatten nested dictionaries, compressing keys
...n below lets you do both (since you could merely concatenate all the keys, then postprocess them).
(Performance is not likely an issue, but I'll elaborate on the second point in case anyone else cares: In implementing this, there are numerous dangerous choices. If you do this recursively and yield...
Why is i++ not atomic?
...iable at the same time, they may both get the same current value of i, and then increment and set it to i+1, so you'll get a single incrementation instead of two.
Example :
int i = 5;
Thread 1 : i++;
// reads value 5
Thread 2 : i++;
// reads value 5
Thread 1 : // increments i...
How do I find the length of an array?
...
If you mean a C-style array, then you can do something like:
int a[7];
std::cout << "Length of array = " << (sizeof(a)/sizeof(*a)) << std::endl;
This doesn't work on pointers (i.e. it won't work for either of the following):
int *p ...