Question

I have table as below

create table myTable (id int, 
                  col1 varchar(20),
                  col2 varchar(20),
                  col3 varchar(20),
                  col4 varchar(20),
                  col5 varchar(20),
                  col6 varchar(20),
                  col7 varchar(20),
                  col8 varchar(20),
                  col9 varchar(20)
                 );

And have data as

insert into myTable values
(1, 'col1','col2','col3','col4','col5','col6','col7','col8','col9');

What I want is output as

id +  AllInOne
++++++++++++++++++++++++++++++++++++++++++++++++++
 1 + col1-col2-col3-col4-col5-col6-col7-col8-col9
++++++++++++++++++++++++++++++++++++++++++++++++++

Any idea how to get this done with smallest query? I know I could do above with use of CONCATENATE. But I would need is some other way. Maybe some pre-defined MySQL function?

Data at sqlfiddle

Answer 1

Use CONCAT_WS, that concatenates strings (skipping null ones) with a separator:

SELECT id, CONCAT_WS('-', col1, col2, col3, col4, col5, col6, col7, col8, col9)
FROM your_table