選擇最小，最大，平均值，其中

Question

我正在使用MySQL。

我想選擇最小，最大和平均長度的領域，但我不知道如何。類似這樣的：

SELECT 
    min as min, 
    max as max, 
    avg as avg 
FROM COLUMNS 
WHERE COLUMN_NAME like '%password%' 

任何想法？

Answer 1

select 
    column_name, 
    min(length(column_name)) as min, 
    max(length(column_name)) as max, 
    avg(length(column_name)) as avg 
from columns 
where column_name like '%password%' 
group by column_name 

Answer 2

SELECT Min(COLUMN_NAME), 
     Max(COLUMN_NAME), 
     Avg(COLUMN_NAME) 
    FROM TABLENAME 
WHERE COLUMN_NAME LIKE '%password%' 

Answer 3

SELECT Min(MENTION_COLUMN_NAME_HERE) AS minimum_value, 
     Max(MENTION_COLUMN_NAME_HERE) AS maximum_value, 
     Avg(MENTION_COLUMN_NAME_HERE) AS average_value 
    FROM COLUMNS 
WHERE COLUMN_NAME LIKE '%passord%'