mysql 拼接字符串已达到预期效果

ruby

CONCAT

msg_doctor_name = agent.doctors.where(go_public_sea_day:3).joins(:orders).select("CONCAT(doctors.name,'(',count(orders.id),'单)') as msg").map(&:msg) || nil

SELECT CONCAT(doctors.name,'(',count(orders.id),'单)') as msg FROM `doctors` INNER JOIN `orders` ON `orders`.`doctor_id` = `doctors`.`id` INNER JOIN `agent_doctors` ON `doctors`.`id` = `agent_doctors`.`doctor_id` WHERE `agent_doctors`.`agent_id` = 350 AND `doctors`.`go_public_sea_day` = 3