sql server - Skipping duplicated rolled up rows where data is NULL -

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i create report organization hierarchy positions. hierarchy has 4 levels, position last leaf, path not 4 levels deep.

for example:

company > position

company > section > department > position

i want number of personnel.

declare @hierarchy table (     company nvarchar(50),     section nvarchar(50),     department nvarchar(50),     unit nvarchar(50),     position nvarchar(50),     person nvarchar(50) )  insert @hierarchy values ('wd', 'weapons', 'it', 'officer', null, 'wile e.'), ('acme', 'weapons', 'it', 'network', 'engineer', 'brain'), ('acme', 'weapons', 'it', 'network', 'support', 'pinky'), ('acme', 'weapons', 'it', 'officer', null, 'bugs'), ('acme', 'weapons', 'it', 'officer', null, 'elmer'), ('acme', 'weapons', 'it', 'officer', null, 'daffy'), ('acme', 'weapons', 'tech', null, null, 'sylverster'), ('acme', 'anvils', 'officer', null, null, 'road')  select company, section, department, unit, position, count(person) @hierarchy group rollup(company, section, department, unit, position)

in above example, same 3 rows wd (wd, anvils, officer, null, null), 1 enough, because unit , position not applicable.

however, if put distinct in query, seemingly result

select distinct company, section, department, unit, position, count(person) @hierarchy group rollup(company, section, department, unit, position)

what don't know if hack , got lucky, or if it's correct approach problem?

let's add grouping columns every level:

select      company,      section,      department,      unit,      position,      grouping(company) company,      grouping(section) section,      grouping(department) department,     grouping(unit) unit,     grouping(position) position,     count(*) @hierarchy group rollup(company, section, department, unit, position)

and @ duplicate values:

company    section    department unit       position   company section department unit position  ---------- ---------- ---------- ---------- ---------- ------- ------- ---------- ---- -------- ----------- acme       anvils     officer    null       null       0       0       0          0    0        1 acme       anvils     officer    null       null       0       0       0          0    1        1 acme       anvils     officer    null       null       0       0       0          1    1        1 acme       anvils     null       null       null       0       0       1          1    1        1 acme       weapons            network    engineer   0       0       0          0    0        1 acme       weapons            network    support    0       0       0          0    0        1 acme       weapons            network    null       0       0       0          0    1        2 acme       weapons            officer    null       0       0       0          0    0        3 acme       weapons            officer    null       0       0       0          0    1        3 acme       weapons            null       null       0       0       0          1    1        5 acme       weapons    tech       null       null       0       0       0          0    0        1 acme       weapons    tech       null       null       0       0       0          0    1        1 acme       weapons    tech       null       null       0       0       0          1    1        1 acme       weapons    null       null       null       0       0       1          1    1        6 acme       null       null       null       null       0       1       1          1    1        7 wd         weapons            officer    null       0       0       0          0    0        1 wd         weapons            officer    null       0       0       0          0    1        1 wd         weapons            null       null       0       0       0          1    1        1 wd         weapons    null       null       null       0       0       1          1    1        1 wd         null       null       null       null       0       1       1          1    1        1 null       null       null       null       null       1       1       1          1    1        8

(acme,anvils,officer) repeats 3 times, every time it's new level of grouping: department, department , unit, department, unit , position. it' because use columns in group by. values in unit , position null.

so, can add distinct query unique results columns - it's correct.


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