Mysql 查詢在存儲過程中花費了太多時間

Question

我正在使用存儲過程來獲取一些數據，但是我的 sql 查詢需要很長時間：

   CREATE DEFINER=``@`%` PROCEDURE `test_sp`(in _orderIds varchar(255))
     BEGIN
     drop temporary table if exists temp;
     create temporary table temp( val int );
     set @sql = concat("insert into temp (val) values ('", 
     replace((_orderIds), ",", "'),('"),"');");
     prepare stmt1 from @sql;
     execute stmt1;

      SELECT  p.productid,p.HSNNo,oi.orderid,cast(IFNULL(oi.dispatched,0) as 
      decimal(10,2)) 
        FROM orderitem oi
        inner JOIN producttax pt on pt.ProductId=oi.productid
        inner JOIN product p on p.ProductId=pt.ProductId
        WHERE oi.orderid in(select val from temp)
        GROUP BY oi.productid,p.HSNNo,oi.orderid,oi.orderitemid;
         END

如果我將在沒有臨時表的情況下使用相同的，那么它的工作良好：

CREATE DEFINER=``@`%` PROCEDURE `test_sp`(in _orderIds varchar(255))
    BEGIN
  drop temporary table if exists temp;
    create temporary table temp( val int );
    set @sql = concat("insert into temp (val) values ('", 
    replace((_orderIds), ",", "'),('"),"');");
    prepare stmt1 from @sql;
    execute stmt1;
    SELECT  p.productid,p.HSNNo,oi.orderid,cast(IFNULL(oi.dispatched,0) as 
     decimal(10,2)) 

        FROM orderitem oi
        inner JOIN producttax pt on pt.ProductId=oi.productid
        inner JOIN product p on p.ProductId=pt.ProductId
        WHERE oi.orderid in(5465,7687,876)
        GROUP BY oi.productid,p.HSNNo,oi.orderid,oi.orderitemid;
        END

Answer 1

讓我們在加入其他表之前過濾第一個orderitem 。

create DEFINER=``@`%` procedure `test_sp`(in _orderIds varchar(255))
begin
    drop temporary table if exists temp;
    create temporary table temp(val int );
    set @sql = concat("insert into temp (val) values ('", 
    replace((_orderIds), ",", "'),('"),"');");
    prepare stmt1 from @sql;
    execute stmt1;

    select  p.productid,p.HSNNo,oi.orderid,cast(IFNULL(oi.dispatched,0) as 
        decimal(10,2)) 
    from 
        (select orderid, dispatched, productid from orderitem where orderid in (select val from temp)) oi
    inner join producttax pt on pt.ProductId=oi.productid
    inner join product p on p.ProductId=pt.ProductId    
    group by oi.productid,p.HSNNo,oi.orderid,oi.orderitemid;
end