mySQL - Count Distinct row based on criteria in one column

Question

I have a table with the following columns:

    id          hcp_id          status
    1           10              True
    2           10              False
    3           10              True
    4           20              True
    5           20              True
    6           20              True
    7           30              False
    8           30              True
    9           30              True

The results should be:

    Results:

    hcp_id
           10 = 0
           20 = 1
           30 = 0

Basically, if all entries for a specific hcp_id has no False status, count it as one. After which, sum all the results:

    Result = 0 + 1 + 0

Also, it has to work in ADODB with mySQL ODBC for VB6

Is this possible as well as doing it in a single query?

Other things to consider is speed since this will be done in a table with at least 14,000 or more records.

Answer 1

For mysql you can do in this way ,but i have no idea how to write it for ADODB

SELECT 
 hcp_id, 
CASE WHEN COALESCE(SUM(`status` ='False')) =0 THEN 1
ELSE 0 END `all_true`
FROM
  t 
GROUP BY hcp_id

Demo