订单表被编译器读取为ORDER命令

Question

我将此SQL语句存储在字符串变量中

SELECT
    o.id_order,
    o.registerdate,
    i.latest_invoice,
    d.latest_delivery 
  FROM
    order o 
  JOIN
    (
      SELECT
        id_address,
        max(registerdate) as latest_invoice 
      FROM
        invoice 
      GROUP BY
        id_address
    ) i     
      ON o.id_address = i.id_address  
  JOIN
    (
      SELECT
        id_address,
        max(registerdate) as latest_delivery 
      FROM
        delivery 
      GROUP BY
        id_address
    ) d      
      ON o.id_address = d.id_address  
  WHERE
    o.id_address = '189'

执行查询时，在order o的位置出现错误，因为编译器认为这是ORDER BY命令。你知道我该怎么避免吗？

Answer 1

您不应将保留关键字用作表名，但是如果您坚持要have to use double quotes：

from "order" o

请注意，双引号名称区分大小写。根据创建该表的方式，您可能需要"ORDER"或"Order"。在psql中，您应该使用\d命令检查大小写是否正确。