SQL Server/DB2: Same query returns different results? -

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summary

i'm working on project have query against underlying database engine last changes of records represents users accesses.

each user may, , not mandatory to, have children accounts. children accounts stored within same data table reference parent through id_pusr table field. when account primary, id_pusr null

each time acces changed, new record created in database users table, last update date (dt_updt).

data sample

please consider following:

create table users (    id_users int // primary key     , ln_user varchar(128)     , fn_user varchar(128)     , cd_user varchar(128)     , dt_updt datetime     , id_pusr int // foreign key users.id_users. )  id_users cd_user    ln_user      fn_user     dt_updt                     id_pusr ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯    808   t_pei00    ln_user_00   fn_user_00  2011-01-01-00.00.00.000000    null    809   t_pei00    ln_user_00   fn_user_00  2010-01-01-00.00.00.000000    null    810   t_pei00    ln_user_00   fn_user_00  2009-01-01-00.00.00.000000    null    811   t_pei00    ln_user_00   fn_user_00  2008-01-01-00.00.00.000000    null    812   t_pei00    ln_user_00   fn_user_00  2007-01-01-00.00.00.000000    null     813   t_pei00a   ln_user_00   fn_user_00  2011-01-01-00.00.00.000000    808    814   t_pei00a   ln_user_00   fn_user_00  2010-01-01-00.00.00.000000    809    815   t_pei00a   ln_user_00   fn_user_00  2009-01-01-00.00.00.000000    810    816   t_pei00a   ln_user_00   fn_user_00  2008-01-01-00.00.00.000000    811    817   t_pei00a   ln_user_00   fn_user_00  2007-01-01-00.00.00.000000    812    818   t_maw00    ln_user_01   fn_user_01  2010-01-01-00.00.00.000000    null     819   t_maw00    ln_user_01   fn_user_01  2009-01-01-00.00.00.000000    null    820   t_maw00    ln_user_01   fn_user_01  2008-01-01-00.00.00.000000    null    821   t_maw00    ln_user_01   fn_user_01  2007-01-01-00.00.00.000000    null    822   t_vem08    ln_user_08   fn_user_08  2009-01-01-00.00.00.000000    null    823   t_vem08    ln_user_08   fn_user_08  2008-01-01-00.00.00.000000    null    824   t_vem08    ln_user_08   fn_user_08  2007-01-01-00.00.00.000000    null    825   t_lac99    ln_user_99   fn_user_99  2008-01-01-00.00.00.000000    null    826   t_lac99    ln_user_99   fn_user_99  2007-01-01-00.00.00.000000    null

i double-checked data table content within both database servers , can certify identical records.

sql/db2 query

this query compatible both sql server , db2 database engines:

with upg (     select id_users             , cd_user             , ln_user             , fn_user             , dt_updt             , id_pusr             , row_number() on (partition cd_user order cd_user desc) rownum         users     ) select id_users         , cd_user         , ln_user         , fn_user         , dt_updt         , id_pusr         , rownum     upg     rownum = 1     order cd_user

different results!

despite fact i'm running same exact identical query against above-mentioned rdbms, obtain different results follows:

ibm db2

id_users cd_user    ln_user      fn_user     dt_updt                    id_pusr  rownum ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯   826    t_lac99    ln_user_99   fn_user_99  2007-01-01-00.00.00.000000  null      1   821    t_maw00    ln_user_01   fn_user_01  2007-01-01-00.00.00.000000  null      1   808    t_pei00    ln_user_00   fn_user_00  2011-01-01-00.00.00.000000  null      1   814    t_pei00a   ln_user_00   fn_user_00  2010-01-01-00.00.00.000000  809       1   822    t_vem08    ln_user_08   fn_user_08  2009-01-01-00.00.00.000000  null      1

these results appears until can see difference between 2 database engines. notice date values in dt_updt field.

sql server

id_users cd_user    ln_user      fn_user     dt_updt                    id_pusr  rownum ¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯   727    t_lac99    ln_user_99   fn_user_99  2008-01-01 00:00:00.000     null      1   720    t_maw00    ln_user_01   fn_user_01  2010-01-01 00:00:00.000     null      1   710    t_pei00    ln_user_00   fn_user_00  2011-01-01 00:00:00.000     null      1   715    t_pei00a   ln_user_00   fn_user_00  2011-01-01 00:00:00.000     710       1   724    t_vem08    ln_user_08   fn_user_08  2009-01-01 00:00:00.000     null      1

these results here in sql server 1 shall come in db2. represent "good" datum. id_users, id's, matters dates.

questions

  1. how can same query returns different results using 2 sql ansi capable engines?
  2. is datum don't seem see?
  3. how with...as () interpreted db2 shall differ sql server?

nota benne: simple select * users order cd_user reveals same data.

your query undeterministic ties.

row_number() on (partition cd_user order cd_user desc) rownum

doesn't define particular row_numbering within each partition. if want both rdbms's return same results order unique there no ties , deterministic results.


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