sql server - Except Operator T-SQL -


task: display c_id , c_name customers have @ least 1 purchase in 2 of months not in 3 months.

first month = november second month = december third month = january    select c_id, c_name books month(order_date) = 11 intersect select c_id, c_name  books month(order_date) = 12 except select c_id, c_name books month(order_date) = 1

the current code have negates 3rd month doesn't fulfill task asking select 2 months interchangeably.

rule is: no count, no subquery, no join(s)

i managed come this.

select c_id,c_name books month(order_date) = 1 intersect  select c_id,c_name books month(order_date) = 11 union select c_id,c_name books month(order_date) = 1 intersect  select c_id,c_name books month(order_date) = 12 union select c_id,c_name books month(order_date) = 12 intersect  select c_id,c_name books month(order_date) = 11 except select c_id,c_name books month(order_date) = 1 intersect  select c_id,c_name books month(order_date) = 11 intersect  select c_id,c_name books month(order_date) = 12

this equivalent expression:

(set intersect set b) union (set intersect set c) union (set c intersect set b) minus (set intersect set b intersect set c),

or can see in image, regions ab, ac , bc

this not elegant, given requirements, seems brute force valid approach.


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