Effective way To use Count and JOIN in PRESTO CASE statements

问题

This is on back of a question raised earlier on Effective way in PRESTO to Result output with boolen values. Please refer the question for more details.

On back of the question two solutions are availabe.

SELECT  dp.USER_NAME,
        dp.ID, 
        CASE 
            WHEN dp.sex='F' THEN 'True' 
            ELSE 'False' 
        END AS Rule_1,
        CASE 
            WHEN dp.sex='M' THEN 'True' 
            ELSE 'False' 
        END AS Rule_2,
        CASE 
            WHEN dp.sex not in ('M','F') THEN 'True' 
            ELSE 'False' 
        END AS Rule_3
FROM    user_details dp where dp.Organisation='007';

SELECT dp.USER_NAME, dp.ID, 
       (dp.sex = 'F') AS Rule_1,
       (dp.sex = 'M') AS Rule_2,
       (dp.sex not in ('M','F')) AS Rule_3
FROM user_details dp 
WHERE dp.Organisation = '007';

Questions:

With CASE I cant able to use COUNT how can i add a rule if i want to see COUNT is greater than 2. (Count(*) > 0) = True else False with JOIN Tables to the selected Query?

Is there a way to user COUNT in case?

What im trying to create:

SELECT dp.USER_NAME, dp. ID, 
       (dp.sex = 'F') AS Rule_1,
       (dp.sex = 'M') AS Rule_2,
       (dp.sex not in ('M','F')) AS Rule_3,
       (dp.DateOfBirth NOT BETWEEN timestamp '1986-04-01' AND timestamp '2001-03-31') AS Rule_4,
       (count(up.*)>10) AS Rule_5,
FROM user_details dp 
JOIN user_purchase up on up.user_id=dp.id
where dp.Organisation='007';

In the above query i'm trying to post a Boolean value if the user_purchase table last data > 10, that particular row output value should be True else False.

USER_NAME   |  ID | Rule 1 | Rule 2 | Rule 3 | Rule 4 | Rule 5

user1          1     true    false    true     true     true

user2          2     false   true     true     true     true

user3          3     true    true     true     true     false

来源：https://stackoverflow.com/questions/62874110/effective-way-to-use-count-and-join-in-presto-case-statements

标签

sql

presto