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Oracle SQL escape character (for a '&')
... off using
SET DEFINE OFF
then you won't have to worry about escaping or CHR(38).
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Convert column classes in data.table
...s:
$ ID : Factor w/ 2 levels "A","B": 1 1 1 1 1 2 2 2 2 2
$ Quarter: chr "1" "2" "3" "4" ...
$ value : num -0.838 0.146 -1.059 -1.197 0.282 ...
Using lapply and as.character:
dtnew <- dt[, lapply(.SD, as.character), by=ID]
str(dtnew)
Classes ‘data.table’ and 'data.frame': 10 ...
Ruby: How to get the first character of a string
...
For completeness sake, since Ruby 1.9 String#chr returns the first character of a string. Its still available in 2.0 and 2.1.
"Smith".chr #=> "S"
http://ruby-doc.org/core-1.9.3/String.html#method-i-chr
...
Escaping ampersand character in SQL string
...etric Vectors \& Matrices'
use
node_name = 'Geometric Vectors ' || chr(38) || ' Matrices'
38 is the ascii code for ampersand, and in this form it will be interpreted as a string, nothing else. I tried it and it worked.
Another way could be using LIKE and an underline instead the '&'...
How can I output a UTF-8 CSV in PHP that Excel will read properly?
...e sure that you add the UTF-16LE byte order mark to the start of the file
chr(255) . chr(254)
The next problem that appears only with Excel on OS X (but not Windows) will be when viewing a CSV file with comma separated values, Excel will render rows only with one row and all of the text along wi...
Simultaneously merge multiple data.frames in a list
...ce(left_join, by = "i")
# A tibble: 3 x 4
# i j k l
# <chr> <int> <int> <int>
# 1 a 1 NA 9
# 2 b 2 4 NA
# 3 c 3 5 7
You can also perform other joins, such as a full_join or inner_join:
list(x, y, z) %>% reduce(full_j...
Split comma-separated strings in a column into separate rows
...column having the same number of strings. i.e. data.table(id= "X21", a = "chr1;chr1;chr1", b="123;133;134",c="234;254;268") becoming data.table(id = c("X21","X21",X21"), a=c("chr1","chr1","chr1"), b=c("123","133","134"), c=c("234","254","268")) ?
– Reilstein
...
PL/SQL, how to escape single quote in a string?
...
In addition to DCookie's answer above, you can also use chr(39) for a single quote.
I find this particularly useful when I have to create a number of insert/update statements based on a large amount of existing data.
Here's a very quick example:
Lets say we have a very simpl...
Algorithm to get the excel-like column name of a number
...function getNameFromNumber($num) {
$numeric = $num % 26;
$letter = chr(65 + $numeric);
$num2 = intval($num / 26);
if ($num2 > 0) {
return getNameFromNumber($num2 - 1) . $letter;
} else {
return $letter;
}
}
And if you want it one indexed (1 == A, etc):
f...
Convert from ASCII string encoded in Hex to plain ASCII?
...
>>> txt = '7061756c'
>>> ''.join([chr(int(''.join(c), 16)) for c in zip(txt[0::2],txt[1::2])])
'paul'
i'm just having fun, but the important parts are:
>>> int('0a',16) ...