mysql case else case_value

mysql case else case_value:

case

case_value

when ...then ... else

case_value

end ...

blob

使用cast(... as ...)轉換類型，以下：

select cast(case title 

                    when 1 then 'title1'  

                    when 2 then 'title2' 

                    else title end 

                    as char(20)) as 'title'

from table;

參考：

http://stackoverflow.com/questions/7830506/mysql-case-enumint-when-varchar-else-int-returning-as-blob-how-to-cast-as-a-va