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Case objects vs Enumerations in Scala
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The other difference is that Enumeration enum is ordered out of the box, whereas case object based enum obviosly not
– om-nom-nom
Oct 18 '12 at 11:48
1
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Hashset vs Treeset
... log-time for most operations like add, remove and contains) but offers no ordering guarantees like TreeSet.
HashSet
the class offers constant time performance for the basic operations (add, remove, contains and size).
it does not guarantee that the order of elements will remain constant over ti...
In SQL, how can you “group by” in ranges?
...on Tuffin, however when you have two ranges like 10-20 , 100-200, then the order does not work. you would have order like 10-20, 100-200,20-30 etc. Any tip for the order by?
– Zo Has
Mar 26 '14 at 5:22
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How can I retrieve Id of inserted entity using Entity framework? [closed]
...here in-case people are looking to "solve" the problem I had.
Consider an Order object that has foreign key relationship with Customer. When I added a new customer and a new order at the same time I was doing something like this;
var customer = new Customer(); //no Id yet;
var order = new Order();...
Dynamically select data frame columns using $ and a character value
...the second is a data.frame
mtcars[[var]]
mtcars[var]
You can perform the ordering without loops, using do.call to construct the call to order. Here is a reproducible example below:
# set seed for reproducibility
set.seed(123)
df <- data.frame( col1 = sample(5,10,repl=T) , col2 = sample(5,10,r...
SQLiteDatabase.query method
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whereArgs
specify the content that fills each ? in whereClause in the order they appear
the others
just like whereClause the statement after the keyword or null if you don't use it.
Example
String[] tableColumns = new String[] {
"column1",
"(SELECT max(column1) FROM table2) AS ma...
Why would anyone use set instead of unordered_set?
C++0x is introducing unordered_set which is available in boost and many other places. What I understand is that unordered_set is hash table with O(1) lookup complexity. On the other hand, set is nothing but a tree with log(n) lookup complexity. Why on earth would anyone use set instead ...
What is the attribute property=“og:title” inside meta tag?
...third-party website to Facebook when a page is shared (or liked, etc.). In order to make this possible, information is sent via Open Graph meta tags in the <head> part of the website’s code.
share
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Javascript regex returning true.. then false.. then true.. etc [duplicate]
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Thanks for the tip. Why exactly does the order matter? Unfortunately, that didn't solve the problem I am seeing. I just tested it in chrome (was using Firefox) and it does the same thing.
– betamax
Apr 13 '10 at 14:49
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How to reset sequence in postgres and fill id column with new data?
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If you don't want to retain the ordering of ids, then you can
ALTER SEQUENCE seq RESTART WITH 1;
UPDATE t SET idcolumn=nextval('seq');
I doubt there's an easy way to do that in the order of your choice without recreating the whole table.
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