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Why use multiple columns as primary keys (composite primary key)
...ble as for other keys.
Their choice of example is perhaps misleading you by combining a meaningless key (P_Id) and a natural key (LastName). This odd choice of primary key says that the following rows are valid according to the schema and are necessary to uniquely identify a student. Intuitively t...
Open Facebook page from Android app?
...t, and is very easy.
I discovered this after looking into how emails send by facebook opened the app.
// e.g. if your URL is https://www.facebook.com/EXAMPLE_PAGE, you should put EXAMPLE_PAGE at the end of this URL, after the ?
String YourPageURL = "https://www.facebook.com/n/?YOUR_PAGE_NAME";
Int...
How to get primary key column in Oracle?
...s.constraint_name = cols.constraint_name
AND cons.owner = cols.owner
ORDER BY cols.table_name, cols.position;
Make sure that 'TABLE_NAME' is in upper case since Oracle stores table names in upper case.
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How can I delete Docker's images?
...iners. It will not be possible to restore them!
This solution is provided by Techoverflow.net.
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Can someone explain the traverse function in Haskell?
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What do you mean by 'sequencing side effects' ? What is 'side effect' in your answer - I just thought that side effects are possible only in monads. Regards.
– Marek
Mar 3 '18 at 13:12
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Best practices for Storyboard login screen, handling clearing of data upon logout
...but your comment about lack of animation is very valid. That can be solved by this answer: stackoverflow.com/questions/8053832/…
– HughHughTeotl
Jul 10 '15 at 22:21
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Excel RTD(Excel Real-Time Data)实时刷新数据技术 - C/C++ - 清泛网 - 专注C/C++及内核技术
... xlRTDUpdate = CallbackObject;
//2000 millisecond by default.
int intv = 2000;
//'Create the time with a 5000 millisecond interval.
tmrTimer = new Timer(intv);
tmrTimer.AutoReset = true;
tmrTimer.Elapsed +=...
Random string generation with upper case letters and digits
...sn't create the list in memory, but generates the elements on the fly, one by one (more about this here).
Instead of asking to create 'n' times the string elem, we will ask Python to create 'n' times a random character, picked from a sequence of characters:
>>> random.choice("abcde")
'a'
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Can angularjs routes have optional parameter values?
... Would like to know if anyone has a solution for the problem reported by @JamesBell
– Leiko
Feb 4 '15 at 17:03
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Objective-C pass block as parameter
...jective-C code, how can I tell if a block is escaping or not? I read that by default, blocks are escaping except if decorated with NS_NOESCAPE, but enumerateObjectsUsingBlock I'm told is non-escaping, yet I don't see NS_NOESCAPE anywhere in site, nor is escaping mentioned at all in the Apple docs. ...