mysql - Aggregate function after having clause -


considering have following schema:

emp(eid:integer, ename:string, age:integer, salary:real) works(eid:integer, did:integer, pct_time:integer) dept(did:integer, budget:real, managerid:integer)

the question asks "if manager manages more 1 department, or controls sum of budgets departments. find managerids of managers control more $5 million." wrote following queries problem:

version 1:

select d.managerid    department d  group  managerid  having (select sum(d2.budget)            department d2           d.managerid = d2.managerid) > 5000000

version 2:

select   d.managerid     department d  group managerid  having   sum(d.budget) > 5000000

i know difference between above 2 queries? nested select statement required having clause?

edit: version 1 redundant since group by keyword allows sum function return sum of department budgets each manager?


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