mysql 合併兩列數據示例

原表demo1:

現希望將last_name和first_name兩列合併形成新列name,並在name中間有空格

select id,concat(last_name,'  ','first_name') as name
from demo1;

現希望將last_name和first_name兩列合併形成新列name

select id,concat(last_name,first_name') as name
from demo1;