SQL case语句

Posted 2020-08-11 March On

示例：

select
    id,
    name,
    case user_role
when 0 then
    "管理员"
when 1 then
    "未注册用户"
when 2 then
    "注册用户"
else
    concat("未知值:", user_role)
end 
“角色”
from
    user