SELECT

    CASE 

        WHEN

            column IS NULL OR another_column = 1

        THEN

            'yes' 

        ELSE

            'no' 

    END AS 'MyData'

FROM

    table_name;

 select 

(CASE

    WHEN (market_cap < 300000000) THEN 'micro'

    WHEN (market_cap < 2000000000) THEN 'small'

    WHEN (market_cap < 10000000000) THEN 'mid'

    WHEN (market_cap < 50000000000) THEN 'large'

ELSE 'mega'

END) AS `cap_type`

from companies;

SELECT 

CASE WHEN COUNT(user_p_id) > 1 

    THEN CONCAT('Multiple Clients (', COUNT(user_p_id),')')

    ELSE client_name 

    END AS client_name, client_email

FROM user_profile

LEFT JOIN users ON (user_p_id = user_id)

SELECT column1,

       CASE

           WHEN condition1 AND condition2 THEN result1

           WHEN condition3 AND condition4 THEN result2

           ELSE result3

       END

FROM your_table;