POSTGRESQL,FROM 中的子查询必须有别名

Question

CREATE OR REPLACE FUNCTION sp_insert_nike_mapping_code ( shopId bigint ) RETURNS VOID AS $body$
BEGIN

    insert into temp_t_so_sales_order_push(so_code,seq)
   SELECT so_code,nextval('s_t_so_sales_order_push_code') from (
   SELECT so_code from t_so_sales_order_push where sync_status = 0 group by so_code
   );

   update t_so_sales_order_push pu
   set code = (
       SELECT temp.seq from temp_t_so_sales_order_push temp
       where temp.so_code = pu.so_code and pu.shop_id = shopId and pu.sync_status = 0
   )
   where exists(
          SELECT 1 from temp_t_so_sales_order_push temp
          where temp.so_code = pu.so_code and pu.shop_id = shopId and pu.sync_status = 0
   );
END
$body$
LANGUAGE PLPGSQL
SECURITY DEFINER
;

当我执行上述代码时，出现语法错误：FROM 中的子查询必须有别名。 [Err] 错误：FROM 中的子查询必须有别名 第 5 行：...选择 so_code,nextval('s_t_so_sales_order_push_code') 来自 ( ^ 提示：例如，FROM (SELECT ...) [AS] foo。

有人帮我吗？

Answer 1

insert into temp_t_so_sales_order_push(so_code,seq)
   SELECT t.so_code,nextval('s_t_so_sales_order_push_code') from (
   SELECT so_code from t_so_sales_order_push where sync_status = 0 group by so_code
   ) as t;