大约有 46,000 项符合查询结果（耗时：0.0464秒） [XML]
Determine the data types of a data frame's columns
...7.6, 167.6...
$ hp <dbl> 110, 110, 93, 110, 175, 105, 245, 62, 95, 123, 123, 180, 180, 180, 205, 215...
$ drat <dbl> 3.90, 3.90, 3.85, 3.08, 3.15, 2.76, 3.21, 3.69, 3.92, 3.92, 3.92, 3.07, 3.0...
$ wt <dbl> 2.620, 2.875, 2.320, 3.215, 3.440, 3.460, 3.570, 3.190, 3.150, 3.440, 3...
Oracle: how to UPSERT (update or insert into a table?)
...hioned way"):
begin
insert into t (mykey, mystuff)
values ('X', 123);
exception
when dup_val_on_index then
update t
set mystuff = 123
where mykey = 'X';
end;
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Similarity String Comparison in Java
...id main(String[] args) {
printSimilarity("", "");
printSimilarity("1234567890", "1");
printSimilarity("1234567890", "123");
printSimilarity("1234567890", "1234567");
printSimilarity("1234567890", "1234567890");
printSimilarity("1234567890", "1234567980");
printSimilarity(...
Best way to pretty print a hash
...\2:"). # "foo": 1 -> foo: 1
gsub(/(^\s*)(".*?"):/, "\\1\\2 =>") # "123": 1 -> "123" => 1
{
a: 1,
"2" => 3,
"3" => nil
}
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Adding :default => true to boolean in existing Rails column
...
change_column :things, :price_1, :integer, default: 123, null: false
Seems to be best way to add a default to an existing column that doesn't have null: false already.
Otherwise:
change_column :things, :price_1, :integer, default: 123
Some research I did on this:
https:...
Can a CSV file have a comment?
... I have more often seen and used: #Csv/Version 1.9 Time,ValueA,ValueB 0.0, 123, 456 0.1, 123, 349
– Crog
Aug 25 at 8:31
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How do you Encrypt and Decrypt a PHP String?
...xample I want to pass a GET parameter from page to page, let's say prod_id=123 but I just do not want to make 123 readable for everybody, however even if they could read it, it won't be a problem. An attacker being able to replace the 123 to a custom value won't cause any harm, he/she will only be a...
Learning Regular Expressions [closed]
...ore characters, and terminated by a right-parenthesis.
If your input is '(123) (456)', then the first capture will be '123'. Non-greedy quantifiers want to allow the rest of the pattern to start matching as soon as possible.
(As to your confusion, I don't know of any regular-expression dialect whe...
ValueError: invalid literal for int() with base 10: ''
...answered Apr 23 '19 at 3:21
Brad123Brad123
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Get folder name from full file path
... answered Jun 27 '18 at 15:39
123iamking123iamking
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