sql server - Pivot millons of records -

-

i have table 4 columns , more 100 million records. table design:

id char(12) pk  type char(2) pk (values 1,2,3) dcid varchar(10) null ind varchar(2) null (values y, n)

this needs pivoted like

id, dcid1, dcid2, dcid3, ind1, ind2, ind3

if type having value 1,then in pivoted table dcid1 should have value or if type 2 dcid2 should have value , on. correspoding ind needs placed in ind1, ind2, ind3 that.

how pivot this?

my suggestion @ using both unpivot , pivot functions result.

the unpivot used convert dci , ind multiple columns multiple rows in single column. once done, can pivot data columns.

the unpivot code similar this:

select id,   col +type new_col,   value (   select id,     type,      dcid,      cast(ind varchar(10)) ind   yt ) d unpivot (   value   col in (dcid, ind) ) unpiv;

see sql fiddle demo. gives result:

|           id | new_col | value | ---------------------------------- | 1            |  dcid1  |  test | | 1            |   ind1  |     y | | 2            |  dcid2  |   est | | 2            |   ind2  |     y |

the new_col contains dcid , ind names , has type value concatenated end. new value apply pivot to:

select id, dcid1, dcid2, dcid3, ind1, ind2, ind3 (   select id,     col +type new_col,     value     (     select id,       type,        dcid,        cast(ind varchar(10)) ind     yt   ) d   unpivot   (     value     col in (dcid, ind)   ) unpiv ) src pivot (   max(value)   new_col in (dcid1, dcid2, dcid3, ind1, ind2, ind3) ) piv;

see sql fiddle demo. result be:

|           id | dcid1 | dcid2 | dcid3 | ind1 | ind2 | ind3 | ------------------------------------------------------------- | 1            |  test |       |       |    y |      |      | | 2            |       |   est |       |      |    y |      | | 3            |       |       |  blah |      |      |    y | | 4            |   yes |       |       |    n |      |      | | 5            |       |    hs |       |      |    n |      | | 6            |       |       |    jr |      |      |    n |

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&qu
Read more

asp.net - Razor Page Hosted on IIS 6 Fails Every Morning -

-
i have simple page in intranet uses razor/asp fetch single record table , display it, plus few graphic, dashboard display. meaning, no user intervention other first time open ie internal url. the problem having every morning ie displays "page not found or network error" message. refresh page, , it's stuck , doesn't display anything. try different pc, open ie internal url , it's stuck... ...until following: login server hosting page run inetmgr go web sites, etc right click on page that's giving me problem , select browse at moment, error message: server error in '/' application. -------------------------------------------------------------------------------- type of page not served. description: type of page have requested not served because has been explicitly forbidden. extension '.cshtml' may incorrect. please review url below , make sure spelled correctly. requested url: /application/dashboard.cshtml ---------------
Read more

c++ - wxwidget compiling on windows command prompt -

-
can please guide me on method,as how compile wxwidget using windows command prompt or msys. [i can't seem find on wxwiki/wxwidget official book/anywhere else] i have compiled wxwidget instructions have provided (using msys). from searching on internet seems 1 can (maybe?) through use of makefile (is correct?) if yes: directory & how should link wx libraries in makefile if no: way besides makefile? i know can use ide's code::block , make life simpler prefer compile using command prompt/msys. thanks in advance.
Read more