- sql = "update customers as c inner join customers as c1 on c.introduce_id = c1.orig_cust_id set c.referral_cust_id = c1.id where c.introduce_id is not null"
- ActiveRecord::Base.connection.execute(sql)
- #也可以搭配一個變數來接收回傳值
- results = ActiveRecord::Base.connection.execute(sql)
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