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Convert varchar to uniqueidentifier in SQL Server
...E @uuid VARCHAR(50)
SET @uuid = 'a89b1acd95016ae6b9c8aabb07da2010'
SELECT CAST(
SUBSTRING(@uuid, 1, 8) + '-' + SUBSTRING(@uuid, 9, 4) + '-' + SUBSTRING(@uuid, 13, 4) + '-' +
SUBSTRING(@uuid, 17, 4) + '-' + SUBSTRING(@uuid, 21, 12)
AS UNIQUEIDENTIFIER)
...
How do you run a single query through mysql from the command line?
... -e "my query"---->ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: YES)
– Dr.jacky
Mar 12 '17 at 11:38
2
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Which regular expression operator means 'Don't' match this character?
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You can use negated character classes to exclude certain characters: for example [^abcde] will match anything but a,b,c,d,e characters.
Instead of specifying all the characters literally, you can use shorthands inside character ...
Why does “,,,” == Array(4) in Javascript?
...
Because the right hand operand is converted to a string and the string representation of Array(4) is ,,,:
> Array(4).toString()
",,,"
If you use the array constructor function and pass a number, it sets the length of t...
How to check if field is null or empty in MySQL?
...LL or field1 = '', 'empty', field1) as field1
from tablename
or
SELECT case when field1 IS NULL or field1 = ''
then 'empty'
else field1
end as field1
from tablename
If you only want to check for null and not for empty strings then you can also use ifnull() or co...
python numpy machine epsilon
...ying to understand what is machine epsilon. According to the Wikipedia, it can be calculated as follows:
3 Answers
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JComboBox Selection Change Listener?
... actionPerformed(ActionEvent e) {
doSomething();
}
});
@John Calsbeek rightly points out that addItemListener() will work, too. You may get 2 ItemEvents, though, one for the deselection of the previously selected item, and another for the selection of the new item. Just don't use both...
How to go to an error using only the keyboard in Eclipse?
... side note, and to complete answer using CTRL+.. To only show errors, you can configure the problems problems visibility level to skip warnings and only show errors.
– el-teedee
Dec 2 '18 at 15:46
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How to open files relative to home directory
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The shell (bash, zsh, etc) is responsible for wildcard expansion, so in your first example there's no shell, hence no expansion. Using the tilde to point to $HOME is a mere convention; indeed, if you look at the documentation for File.expand_path, it correctly interprets the...
Git diff -w ignore whitespace only at start & end of lines
...o be configured in the external tool. I'm not sure if there's anything git can do to present the diff without whitespace changes... could be wrong though; git is pretty powerful...
– johnny
Nov 1 '13 at 15:39
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