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How do I rename a column in a database table using SQL?
If I wish to simply rename a column (not change its type or constraints, just its name) in an SQL database using SQL, how do I do that? Or is it not possible?
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How to extract a substring using regex
...gular expression with a Matcher:
"'(.*?)'"
Example:
String mydata = "some string with 'the data i want' inside";
Pattern pattern = Pattern.compile("'(.*?)'");
Matcher matcher = pattern.matcher(mydata);
if (matcher.find())
{
System.out.println(matcher.group(1));
}
Result:
the data i want
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Convert hyphens to camel case (camelCase)
With regex (i assume) or some other method, how can i convert things like:
13 Answers
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What do linkers do?
...ite into binaries but what do linkers do? They've always been a mystery to me.
4 Answers
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Select last row in MySQL
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Yes, there's an auto_increment in there
If you want the last of all the rows in the table, then this is finally the time where MAX(id) is the right answer! Kind of:
SELECT fields FROM table ORDER BY id DESC LIMIT 1;
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MongoDb query condition on comparing 2 fields
... for exact matches between dates in queries. One workaround is using .getTime() to convert to milliseconds or whatever: this.startDate.getTime() == ISODate("2017-01-20T10:55:08.000Z").getTime()
– leinaD_natipaC
Oct 1 '19 at 10:28
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Serializing with Jackson (JSON) - getting “No serializer found”?
...y rule. Jackson 1.9 provides the ObjectMapper.setVisibility() convenience method for doing so. For the example in the original question, I'd likely configure this as
myObjectMapper.setVisibility(JsonMethod.FIELD, Visibility.ANY);
For Jackson >2.0:
myObjectMapper.setVisibility(PropertyAccess...
Replacing a 32-bit loop counter with 64-bit introduces crazy performance deviations with _mm_popcnt_
... until dest is ready before executing. This false dependency is (now) documented by Intel as erratum HSD146 (Haswell) and SKL029 (Skylake)
Skylake fixed this for lzcnt and tzcnt.
Cannon Lake (and Ice Lake) fixed this for popcnt.
bsf/bsr have a true output dependency: output unmodified for input=0....
ResourceDictionary in a separate assembly
I have resource dictionary files (MenuTemplate.xaml, ButtonTemplate.xaml, etc) that I want to use in multiple separate applications. I could add them to the applications' assemblies, but it's better if I compile these resources in one single assembly and have my applications reference it, right?
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Remove all the children DOM elements in div
I have the following dojo codes to create a surface graphics element under a div:
7 Answers
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