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Add primary key to existing table
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drop constraint and recreate it
alter table Persion drop CONSTRAINT <constraint_name>
alter table Persion add primary key (persionId,Pname,PMID)
edit:
you can find the constraint name by using the query below:
select OBJECT_NAME(...
Change a column type from Date to DateTime during ROR migration
...f you're wondering why a single change method isn't used instead of the up and down methods, it's because the change method doesn't support the change_column migration definition.
– Dennis
Feb 25 '14 at 21:35
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Is there any advantage of using map over unordered_map in case of trivial keys?
... in the case of keys with simple types -- I took a look at the interfaces, and didn't find any significant differences that would impact my code.
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Android mock location on device?
...ou have to enable mock locations in the development panel in your settings and add
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
to your manifest.
Now you can go in your code and create your own mock location provider and set the location of this provider...
How to detect UI thread on Android?
Is there a robust way to detect if Thread.currentThread() is the Android system UI thread in an application?
I would like to put some asserts in my model code that asserts that only one thread ( eg the ui thread) accesses my state, to assure that no kind of synchronization is necessary.
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How to get the index of a maximum element in a numpy array along one axis
... this works fine for integers but what can I do for float values and the numbers between 0 and 1
– Priyom saha
Feb 23 '19 at 8:26
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Can I make a not submit a form?
...button type="button">Submit</button>
In the words of the HTML Standard: "Does nothing."
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How do I set the default font size in Vim?
...ith Vim. I already made research on the web, but all the solutions I found and tried did not work.
5 Answers
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'adb' is not recognized as an internal or external command, operable program or batch file
...ariables. You can find adb in "ADT Bundle/sdk/platform-tools" Set the path and restart the cmd n then try again.
Or
You can also goto the dir where adb.exe is located and do the same thing if you don't wanna set the PATH.
If you wanna see all the paths, just do
echo %PATH%
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How to remove duplicate values from an array in PHP
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+1 array_unique returns an object with key and value pairs AND array_values return only values as an array.
– narainsagar
Sep 21 '18 at 17:16
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