SQL

mysql case when or

SELECT
    CASE 
        WHEN
            column IS NULL OR another_column = 1
        THEN
            'yes' 
        ELSE
            'no' 
    END AS 'MyData'
FROM
    table_name;

mysql switch case

SELECT CASE lower(col1)
	WHEN 'agree' THEN 'Ok'
	WHEN 'disagree' THEN 'Ko'
    ELSE
        CASE 
            WHEN col2 = 1 THEN 'Ko'
            ELSE 'Maybe'
        END
END AS my_result
FROM table_name;

mysql case

 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;

mysql switch case

SELECT 
t2.company_name,
t2.expose_new,
t2.expose_used,
t1.title,
t1.status,
 CASE status
   when 'New' and t2.expose_new = 1 then 1
   when 'New' and t2.expose_new = 2 then 2
   when 'New' and t2.expose_new = 3 then 3
   when 'Used' and t2.expose_used = 1 then 1
   when 'Used' and t2.expose_used = 2 then 2
   when 'Used' and t2.expose_used = 3 then 3
END as expose
FROM `products` t1
join manufacturers t2 on t2.id = t1.seller
where t1.seller = 4238

mysql switch case

mysql> SELECT CASE  WHEN 2>3 THEN 'this is true' ELSE 'this is false' END; 
+-------------------------------------------------------------+
| CASE  WHEN 2>3 THEN 'this is true' ELSE 'this is false' END |
+-------------------------------------------------------------+
| this is false                                               | 
+-------------------------------------------------------------+