Question

i am trying to make a database back/front that contains client info, the info ranges from appointments and notes etc as we are a counselling service, if you miss(dna) 3 sessions you are technically discharged from our service what i want is to automate this process- help i am a self taught newbie, i am trying to do this using “SELECT CASE” but no idea here

id | nhi    | service | type | length | contactdate | notes
1  |PEB8132 | aod     | t32  | 20     | 2012-11-20  | notes go here

This is my table when they don’t attend the length becomes dna and it is this that I want to use to flag after 3 failed attempts.

Answer 1

This one works in Oracle.

select nhi ,sum(case when length='dna' then 1 else 0 end) dna_count 
from table 
group by nhi  
having sum(case when length='dna' then 1 else 0 end)>3;