concat_ws 基于 SQL 查询中列的值的字符串

Question

I am trying to concatenate values from multiple fields using concat_ws . One of the fields ( is_logged ) contains only the values 0 or 1 . I want to concatenate yes if the value of is_logged field is 1 and no otherwise.

Eg - concat_ws('', month,'-', year, ',Logged-', is_logged) info

Current output - Dec - 2020,Logged-1

Expected output - Dec - 2020,Logged-Yes

How can this be achieved? Thanks!

Answer 1

can be different in different dbms but you can do this:

select concat_ws('',month,'-',year,',Logged-',case is_logged when 1 then 'yes' else 'no' end) info
from yourtable

Answer 2

I got this working based on this answer -

concat_ws('', month,'-', year, ',Logged-',IFNULL(ELT(FIELD(is_logged,1),'Yes'),'No')) info