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Why use multiple columns as primary keys (composite primary key)
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Your understanding is correct.
You would do this in many cases. One example is in a relation...
Undefined symbols for architecture i386: _OBJC_CLASS_$_SKPSMTPMessage", referenced from: error
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What does “var FOO = FOO || {}” (assign a variable or an empty object to that variable) mean in Java
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Your guess as to the intent of || {} is pretty close.
This particular pattern when seen at th...
How to execute AngularJS controller function on page load?
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How to use MDC with thread pools?
...ore each task appropriately.
* <p/>
* Created by jlevy.
* Date: 6/14/13
*/
public class MdcThreadPoolExecutor extends ThreadPoolExecutor {
final private boolean useFixedContext;
final private Map<String, Object> fixedContext;
/**
* Pool where task threads take MDC ...
How do you dismiss the keyboard when editing a UITextField
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edited Apr 1 '14 at 20:05
Irfan
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Difference between Pig and Hive? Why have both? [closed]
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Is it possible to change the location of packages for NuGet?
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MongoDB: Is it possible to make a case-insensitive query?
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edited Feb 26 '17 at 14:23
answered Dec 7 '09 at 22:46
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