Group hierarchy using the ROLLUP operator is determined by the order in which the grouping columns are specified. : ROLLUP « Analytical Functions « SQL Server / T-SQL Tutorial

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SQL Server / T-SQL Tutorial » Analytical Functions » ROLLUP 
14. 8. 3. Group hierarchy using the ROLLUP operator is determined by the order in which the grouping columns are specified.
5>
6>
7create table department(
8>    dept_name     char(20)     not null,
9>    emp_cnt       int          not null,
10>    budget        float,
11>    date_month    datetime);
12> GO
1>
2insert into department values('Research', 550000'01.01.2002');
3insert into department values('Research', 1070000'01.02.2002');
4insert into department values('Research', 565000'01.07.2002');
5insert into department values('Accounting', 510000'01.07.2002');
6insert into department values('Accounting', 1040000'01.02.2002');
7insert into department values('Accounting', 630000'01.01.2002');
8insert into department values('Accounting', 640000'01.02.2003');
9insert into department values('Marketing', 610000'01.01.2003');
10insert into department values('Marketing', 1040000'01.02.2003');
11insert into department values('Marketing', 330000'01.07.2003');
12insert into department values('Marketing', 540000'01.01.2003');
13> GO

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)

(rows affected)
1>
2SELECT dept_name, emp_cnt, SUM(budgetsum_of_budgets
3FROM department
4> GROUP BY dept_name, emp_cnt
5> WITH ROLLUP;
6> GO
dept_name            emp_cnt     sum_of_budgets
-------------------- ----------- ------------------------
Accounting                     5                    10000
Accounting                     6                    70000
Accounting                    10                    40000
Accounting                  NULL                   120000
Marketing                      3                    30000
Marketing                      5                    40000
Marketing                      6                    10000
Marketing                     10                    40000
Marketing                   NULL                   120000
Research                       5                   115000
Research                      10                    70000
Research                    NULL                   185000
NULL                        NULL                   425000

(13 rows affected)
1>
2> drop table department;
3> GO
1>
2>
14. 8. ROLLUP
14. 8. 1. Using the ROLLUP Operator
14. 8. 2. A summary query that includes a final summary row with 'WITH ROLLUP'
14. 8. 3. Group hierarchy using the ROLLUP operator is determined by the order in which the grouping columns are specified.
14. 8. 4. A summary query that includes a summary row for each grouping level
14. 8. 5. WITH ROLLUP for calculating subtotals and totals on the first column in the GROUP BY column list
14. 8. 6. Summarizing Data with ROLLUP
14. 8. 7. ROLLUP Returns Super Aggregation Only in One Direction
14. 8. 8. Using ROLLUP to Get the Order Count by Year and Month
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