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PostgreSQL Crosstab Query
...m is also limited to exactly three columns in the provided input query: row_name, category, value. There is no room for extra columns like in the 2-parameter alternative below.
Safe form
crosstab(text, text) with 2 input parameters:
SELECT *
FROM crosstab(
'SELECT section, status, ct
FR...
How do I join two lines in vi?
...ou join lines as is -- without adding or removing whitespaces:
S<Switch_ID>_F<File type>
_ID<ID number>_T<date+time>_O<Original File name>.DAT
Result:
S<Switch_ID>_F<File type>_ID<ID number>_T<date+time>_O<Original File name>.DAT
With...
Initializing a static std::map in C++
...namespace std;
using namespace boost::assign;
map<int, char> m = map_list_of (1, 'a') (3, 'b') (5, 'c') (7, 'd');
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Does JavaScript have a method like “range()” to generate a range within the supplied bounds?
...
1632
Numbers
[...Array(5).keys()];
=> [0, 1, 2, 3, 4]
Character iteration
String.fromCharCo...
adding multiple entries to a HashMap at once in one statement
...
32
You should not use this method. It creates a new class for every time that you use it, which has much worse performance than just plainly c...
How do I list all files of a directory?
...
32
@misterbee, your solution is the best, just one small improvement: _, _, filenames = next(walk(mypath), (None, None, []))
...
What does && mean in void *p = &&abc;
...M and it has access to the entire RAM (that is, 0x00000000-0xFFFFFFFF on a 32-bit machine).
(the above is just a short overwiew of what's happenning, you really need to learn assembly to understand it fully, so bear with me)
Now, the label in a source code is basically an address. "goto label;" does...
Skip certain tables with mysqldump
...!/bin/bash
PASSWORD=XXXXXX
HOST=XXXXXX
USER=XXXXXX
DATABASE=databasename
DB_FILE=dump.sql
EXCLUDED_TABLES=(
table1
table2
table3
table4
tableN
)
IGNORED_TABLES_STRING=''
for TABLE in "${EXCLUDED_TABLES[@]}"
do :
IGNORED_TABLES_STRING+=" --ignore-table=${DATABASE}.${TABLE}"
done
echo "Dump st...
max value of integer
In C, the integer (for 32 bit machine) is 32 bits, and it ranges from -32,768 to +32,767.
In Java, the integer(long) is also 32 bits, but ranges from -2,147,483,648 to +2,147,483,647.
...
Adding git branch on the Bash command prompt
...
PS1='\[\e]0;\u@\h: \w\a\]\n${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]$(__git_ps1)\$ '
Everything is a different color, including the branch.
In in Linux Mint 17.3 Cinnamon 64-bit:
PS1='${debian_chroot:+($debian_chroot)}\[\033...