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What are OLTP and OLAP. What is the difference between them?
...storical data) use OLAP
if you are doing transactions (ex. adding/removing orders on an e-commerce cart) use OLTP
Short answer:
Let's consider two example scenarios:
Scenario 1:
You are building an online store/website, and you want to be able to:
store user data, passwords, previous transact...
How can foreign key constraints be temporarily disabled using T-SQL?
... COL_NAME(RKEYID, RKEY) AS REFERENCED_COLUMN_NAME
FROM SYSFOREIGNKEYS
ORDER BY TABLE_NAME, CONSTRAINT_NAME,REFERENCED_TABLE_NAME, KEYNO
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f...
Big O, how do you calculate/approximate it?
... // 3
}
}
The first thing you needed to be asked is the order of execution of foo(). While the usual is to be O(1), you need to ask your professors about it. O(1) means (almost, mostly) constant C, independent of the size N.
The for statement on the sentence number one is tricky....
How to format strings in Java
...od, so you just have to pass the restURL like this
/customer/{0}/user/{1}/order
and add as many params as you need:
public String createURL (String restURL, Object ... params) {
return new MessageFormat(restURL).format(params);
}
You just have to call this method like this:
createU...
What is the purpose and use of **kwargs?
... it simply interpolates the passed args to the parameters(in left-to-right order) while **kwargs behaves intelligently by placing the appropriate value @ the required place
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Why are two different concepts both called “heap”?
...
Yes, but a heap also implies disorder and memory heaps are generally disordered. The data structure heap is extremely well ordered. So again there's an equal mismatch going the other way based on the common definition of heap.
– jmucch...
Getting “NoSuchMethodError: org.hamcrest.Matcher.describeMismatch” when running test in IntelliJ 10.
...
Make sure the hamcrest jar is higher on the import order than your JUnit jar.
JUnit comes with its own org.hamcrest.Matcher class that is probably being used instead.
You can also download and use the junit-dep-4.10.jar instead which is JUnit without the hamcrest classes.
...
How to create a file in memory for user to download, but not through server?
.... If you have a text or CSV file, start the string with '\ufeff', the Byte Order Mark for UTF-16BE, and text editors will be able to read non-ASCII characters correctly.
– larspars
Nov 19 '14 at 9:06
...
Why does “return list.sort()” return None, not the list?
...e object named -- think of it as an action that the object is taking to re-order itself. The sort function is an operation over the data represented by an object and returns a new object with the same contents in a sorted order.
Given a list of integers named l the list itself will be reordered if ...
MySQL Results as comma separated list
...----------------------------------------+
GROUP_CONCAT with DISTINCT and ORDER BY
SELECT GROUP_CONCAT(DISTINCT TaskName ORDER BY TaskName DESC)
FROM Tasks;
Result:
+--------------------------------------------------------+
| GROUP_CONCAT(DISTINCT TaskName ORDER BY TaskName DESC) |
+----------...