Don’t check for existence. Try to drop, and capture the exception if necessary… DECLARE index_not_exists EXCEPTION; PRAGMA EXCEPTION_INIT (index_not_exists, -1418); BEGIN EXECUTE IMMEDIATE ‘drop index foo’; EXCEPTION WHEN index_not_exists THEN NULL; END; /
I came here seeking for this answer but i found this distance function takes 2 iterators and returns an index cout << distance(mymap.begin(),mymap.find(“198765432”)); hope this helps 😀
This is an open question in NLP, so there is no simple answer. My recommendation for quick-and-dirty “works-for-me” is topia.termextract. Yahoo has a keyword extraction service (http://developer.yahoo.com/search/content/V1/termExtraction.html) which is low recall but high precision. In other words, it gives you a small number of high quality terms, but misses many of the terms in your … Read more
It isn’t trivial. It’s impossible. The best you could do is create an object using numeric properties starting at 1 but that’s not the same thing. Why exactly do you want it to start at 1? Either: Start at 0 and adjust your indices as necessary; or Start at 0 and just ignore index 0 … Read more
For improve performance is possible use numexpr: import numexpr np.random.seed(125) N = 40000000 df = pd.DataFrame({‘A’:np.random.randint(10, size=N)}) def ne(df): x = df.A.values return df[numexpr.evaluate(‘(x > 5)’)] print (ne(df)) In [138]: %timeit (ne(df)) 1 loop, best of 3: 494 ms per loop In [139]: %timeit df[df.A > 5] 1 loop, best of 3: 536 ms per … Read more
Indexes and tables (and views, and sequences, and…) are stored in the pg_class catalog, and they’re unique per schema due to a unique key on it: # \d pg_class Table “pg_catalog.pg_class” Column | Type | Modifiers —————-+———–+———– relname | name | not null relnamespace | oid | not null … Indexes: “pg_class_oid_index” UNIQUE, btree (oid) … Read more
If the values of your enum items are contigious, the array method works pretty well. However, in any case, you could use Dictionary<DayOfTheWeek, string> (which is less performant, by the way).
The implementation is the same on the server-side. The only difference is that with CREATE INDEX syntax, you must specify a name for the index. Whereas with ALTER TABLE, you may specify a name for the index, but you don’t have to. If you don’t specify a name, the server generates a default name, as … Read more
How to find the index of the maximum element? How about trying all indexes and checking whether they are the maximum? ghci> let maxIndex xs = head $ filter ((== maximum xs) . (xs !!)) [0..] But this sounds like something for which a function already exists. My code will be more readable, maintainable, and … Read more
Just use substring_index() twice: SELECT substring_index(substring_index(licence_key, ‘contract=”, -1), “issued=’, 1) FROM table;