oracle - SQL to Find Number of Weeks an Employee Was Active Between Two Dates -

-

i have table list of dates employee became active/inactive , want count weeks employee active within date range.

so table (ps_job) have values this:

emplid     effdt       hr_status ------     -----       ------ 1000       01-jul-11   1000       01-sep-11   1000       01-jan-12   1000       01-mar-12   1000       01-sep-12

the query need show me number of weeks emplid active 01-jul-11 31-dec-12.

the desired result set be:

emplid     weeks_active ------     ------------ 1000       35

i got number 35 adding results sqls below:

select (next_day('01-sep-11','sunday') - next_day('01-jul-11','sunday'))/7 weeks_active dual; select (next_day('01-mar-12','sunday') - next_day('01-jan-12','sunday'))/7 weeks_active dual; select (next_day('31-dec-12','sunday') - next_day('01-sep-12','sunday'))/7 weeks_active dual;

the problem can't seem figure out how create single query statement go through rows every employee within date range , return each emplid , number of weeks active. prefer use basic sql instead of pl/sql can transfer peoplesoft query can run user, willing run user using oracle sql developer if need be.

database: oracle database 11g enterprise edition release 11.2.0.3.0 - 64bit production

here i'm using lead in subquery next date , summing intervals in outer query:

with q (     select emplid, effdt, hr_status         , lead (effdt, 1) on (partition emplid order effdt) next_effdt     ps_job     order emplid, effdt ) select emplid     , trunc(sum((trunc(coalesce(next_effdt, current_timestamp)) - trunc(effdt)) / 7)) weeks_active q hr_status = 'a' group emplid;

the coalesce function grab system date in event cannot find matching i record (employee current). substitute end of year if that's spec.

note i'm not doing rigorous testing see entries ordered a/i/a/i etc., might want add checks of nature if know data requires it.

feel free play @ sql fiddle.


Comments

Post a Comment

Popular posts from this blog

java - Jmockit String final length method mocking Issue -

-
using jmockit 1.2 jar, trying mock string's length method getting unexpected invocation exception: failed: test java.lang.illegalstateexception: missing invocation mocked type @ point; please make sure such invocations appear after declaration of suitable mock field or parameter @ stringdemo.testa$1.<init>(testa.java:17) @ stringdemo.testa.test(testa.java:13) i using testng: @test public void test() throws exception { new expectations() { @mocked("length") string astring; { astring.length(); result = 2; } }; system.out.println(a.showa("test")); } } actual class a: public class { public static int showa(string str){ int a= str.length(); return a; } } this wrong way of recording expected results. shouldn't mock , record string's length() method, record showa() instead. here solution @suppresswarnings("unused...
Read more

What is the difference between data design and data model(ERD) -

-
i have google question , find answer in day. know, data design many many table have list column,and mark pk , fk. why er-diagram have find this? data design process of designing database. main output of data design detailed logical data model of database. some people data design includes of needed logical , physical design choices , physical storage parameters needed generate design in data definition language. technically, database analysis, database analysts (dbas) trained do. while person can both data design , database analysis, these 2 different tasks. data design models data. database analysis takes model , applies 1 or more database engines (relational, hierarchical, nosql). a logical data model 1 of main outputs of data design. data model represented entity relationship diagram, or er diagram.
Read more

ios - Can NSManagedObject conform to NSCoding -

-
i need transfer single object across device. right converting nsmanagedobject dictionary , archiving , sending nsdata. upon receiving unarchiving it. transfer nsmanagedobject archiving , unarchiving instead of creating intermediate data object. @interface test : nsmanagedobject<nscoding> @property (nonatomic, retain) nsstring * title; @end @implementation test @dynamic title; - (id)initwithcoder:(nscoder *)coder { self = [super init]; if (self) { self.title = [coder decodeobjectforkey:@"title"]; //<crash } return self; } - (void)encodewithcoder:(nscoder *)coder { [coder encodeobject:self.title forkey:@"title"]; } @end nsdata *archivedobjects = [nskeyedarchiver archiveddatawithrootobject:testobj]; nsdata *objectsdata = archivedobjects; if ([objectsdata length] > 0) { nsarray *objects = [nskeyedunarchiver unarchiveobjectwithdata:objectsdata]; } the problem above code is. crashes @ self.title in initwithcoder sa...
Read more