在rails中查询为表

Question

大家好我需要一些帮助，你如何在rails控制器中创建这个查询？

SELECT * FROM（SELECT id，amount，user_id FROM payments 在哪里user_id =＆＃39; 10000＆＃39; ORDER BY id DESC）WHERE rownum＆lt; = 1;

Answer 1

这是在rails中的方式

Payment.select('*').from(Payment.select('id,amount,user_id, row_number over () as rn').where("user_id= 10000").order('id DESC')).where('rn <= 1')

OR

Payment.find_by_sql('SELECT * FROM (SELECT id,amount,user_id FROM payments WHERE user_id='10000' ORDER BY id DESC) WHERE rownum <=1')

Answer 2

试试这个：

sql = "SELECT * FROM (SELECT id,amount,user_id FROM payments WHERE user_id='10000' ORDER BY id DESC) WHERE rownum <=1;"

ActiveRecord::Base.connection.execute(sql)