sql - Number of particular days between two dates -


is there "easy" way calculate count of particular day between 2 dates (e.g., wanted know number of tuesdays between 1st january, 2000 , today)? moreover, same question applies more broadly different units (e.g., how many 2pms between 2 dates, how many februaries, how many 21st augusts, etc.)... best i've come (for days between dates) this:

with calendar (   select     to_char(:start + level - 1, 'day') dayofweek         dual   connect level <= ceil(:end - :start) ) select   dayofweek, count(dayofweek)     calendar group dayofweek;

i have create view of -- hardcoding start , end dates -- make convenient(ish) use; either or write function dirty work. wouldn't difficult, i'm wondering if there's oracle function this, accounting things leap days, etc.

edit this popped in related links when posted this. more-or-less answers question days , know there's months_between function use particular months. other related functions should know about?

replace start/end dates dates. query calc number of tue jan 1-2013 till today, 18:

select count(*) number_of_tue    (  select trunc(to_date(sysdate), 'year') + level-1 start_dt       , to_char(trunc(to_date(sysdate), 'year') + level - 1, 'dy') wk_day       , to_char(trunc(to_date(sysdate), 'year') + level - 1, 'd')  wk_day#       , trunc(sysdate) end_dt   dual  connect level <= trunc(sysdate) - trunc(sysdate, 'year') -- replace start/end dates  )  wk_day# = 3 -- or wk_day = 'tue' --  /

Comments

Post a Comment

Popular posts from this blog

php - Why I am getting the Error "Commands out of sync; you can't run this command now" -

the documentation of error mentioned in title says if commands out of sync; can't run command now in client code, calling client functions in wrong order. this can happen, example, if using mysql_use_result() , try execute new query before have called mysql_free_result(). can happen if try execute 2 queries return data without calling mysql_use_result() or mysql_store_result() in between. from here: http://dev.mysql.com/doc/refman/5.0/en/commands-out-of-sync.html but in first query not fetching data mysql database, inserting. , in second query getting data database. here code $connection = mysqli_connect("localhost","username","password","tbl_msgs"); if(mysqli_connect_errno($connection)) { die("failed connect mysql: " . mysqli_connect_error()); } $query = "insert users (total_comments, total_views) values ({$total_comments}, {$total_views});"; $query .= "insert msgs (no...
Read more

linux - Does gcc have any options to add version info in ELF binary file? -

i mean whether gcc can insert source code version infor elf binary section or similar. not want change source file, add info gcc option in makefile. you can emit version info text file, turn text file object file statically link executable. the first step simple have write code: script or write version info in format plain text file. write makefile rule produce version.o version.txt, using objcopy . you'll have object file 2 useful symbols defined in it: beginning , end of textual version info. add generated object executable, , you'll able access version 2 ways: running strings on binary, or writing code in application print version string (you'll need declare start , end symbols variables in header file).
Read more

java - Are there any classes that implement javax.persistence.Parameter<T>? -

i'm using named queries fetch entities database using jpa , hibernate , came across puzzling me: how come there no default implementations of javax.persistence.parameter interface? i rather impressed how @staticmetamodel used criteriabuilder in jpa2 meaning type safety , don't have mess around setting string names. wanted apply similar of jpa1 ejb's i'm working on: dealergroup_.class: public dealergroup_ { public parameter<integer> id = new parameterimpl<integer>("id"); /// etc... } dealergroupfacade.class: // ... public dealergroup fetch(integer id) { typedquery<dealergroup> query = em.createnamedquery("dealergroup.fetchbyid", dealergroup.class); query.setparameter(dealergroup_.id, query); return query.getsingleresult(); } // ... i surprised find there no implementations of parameter interface - of course, implement myself absence makes me suspicious may mistake using in way? should implementing parameter...
Read more