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An efficient way to transpose a file in Bash
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115
awk '
{
for (i=1; i<=NF; i++) {
a[NR,i] = $i
}
}
NF>p { p = NF }
END {...
MySQL: @variable vs. variable. What's the difference?
...nitialize this variable with a SET statement or inside a query:
SET @var = 1
SELECT @var2 := 2
When you develop a stored procedure in MySQL, you can pass the input parameters and declare the local variables:
DELIMITER //
CREATE PROCEDURE prc_test (var INT)
BEGIN
DECLARE var2 INT;
SET var...
How to increment a datetime by one day?
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261
date = datetime.datetime(2003,8,1,12,4,5)
for i in range(5):
date += datetime.timedelta(day...
How do write IF ELSE statement in a MySQL query
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150
You probably want to use a CASE expression.
They look like this:
SELECT col1, col2, (case wh...
How do you know when to use fold-left and when to use fold-right?
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105
You can transfer a fold into an infix operator notation (writing in between):
This example fo...
How to flatten only some dimensions of a numpy array
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129
Take a look at numpy.reshape .
>>> arr = numpy.zeros((50,100,25))
>>> arr.s...
What is the significance of 1/1/1753 in SQL Server?
Why 1753? What do they have against 1752? My great great great great great great great grandfather would be very offended.
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How to change facet labels?
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128
Change the underlying factor level names with something like:
# Using the Iris data
> i &l...
Linux command to list all available commands and aliases
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You can use the bash(1) built-in compgen
compgen -c will list all the commands you could run.
compgen -a will list all the aliases you could run.
compgen -b will list all the built-ins you could run.
compgen -k will list all the keywords you co...
How to use GROUP BY to concatenate strings in SQL Server?
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