MySQL问题：将查询结果添加到同一表的列中

Question

SELECT CONCAT(
  from_unixtime(lastSaleTime/1000, '%Y-%d-%m %h:%i:%s.'),
  CAST(EXTRACT(MICROSECOND FROM from_unixtime(lastSaleTime/1000))/1000 
  AS SIGNED)
) FROM IEX_Tick;

这段代码返回一列值，我想将所有数据添加到我创建的新列中。 上次建议这样做：

UPDATE IEX_Tick SET SomeColumn = (
   SELECT CONCAT(
       from_unixtime(lastSaleTime/1000, '%Y-%d-%m %h:%i:%s.'),
       CAST(EXTRACT(MICROSECOND FROM from_unixtime(lastSaleTime/1000))/1000 AS SIGNED)
   ) FROM IEX_Tick;
)

但是我收到错误消息“您无法在FROM子句中指定目标表'IEX_Tick'进行更新。我查了一下，我们尝试了一些解决方法，例如：

UPDATE IEX_Tick SET SomeColumn = (
   SELECT CONCAT(
       from_unixtime(lastSaleTime/1000, '%Y-%d-%m %h:%i:%s.'),
       CAST(EXTRACT(MICROSECOND FROM from_unixtime(lastSaleTime/1000))/1000 AS SIGNED)
   ) FROM (Select * from IEX_Tick) as RRR;
)

但这仍然行不通

Answer 1

只需避开子查询：

UPDATE IEX_Tick
    SET SomeColumn = CONCAT(from_unixtime(lastSaleTime/1000, '%Y-%d-%m %h:%i:%s.'),
                             CAST(EXTRACT(MICROSECOND FROM from_unixtime(lastSaleTime/1000))/1000 AS SIGNED)
                            );