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Best method to determine number of patients in a department
Try the ROLLUP analytical function. ROLLUP enables an SQL statement to calculate multiple levels of subtotals across a specified group of dimensions. It also calculates a grand total. ROLLUP is a simple extension to the GROUP BY clause, so its syntax is extremely easy to use. It also only does one-pass through the table, so it's efficient too!
SELECT
deptno,
job,
count(*),
sum(sal)
FROM
emp
GROUP BY
ROLLUP(deptno,job);
DEPTNO JOB COUNT(*) SUM(SAL)
--------- --------- --------- ---------
10 CLERK 1 1300
10 MANAGER 1 2450
10 PRESIDENT 1 5000
10 3 8750
20 ANALYST 2 6000
20 CLERK 2 1900
20 MANAGER 1 2975
20 5 10875
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