Mysql查詢優化不佳

Question

我不是sql的專家，我需要以下查詢的幫助。它很差，執行時間也很長。 是否有可能用JOIN()替換IN()以加快查詢速度？ 如何做到這一點？

SELECT * 
FROM shop_orders 
WHERE id IN (SELECT orders_id 
       FROM shop_orders_data 
       WHERE closed = '1' /*AND backorder='0'*/) 
     AND id IN (SELECT orders_id 
        FROM shop_orders_products 
        WHERE products_id IN (SELECT id 
             FROM shop_products 
             WHERE artno = '120000' 
               OR name LIKE '%120000%')) 
ORDER BY created DESC 

Answer 1

Select so.* 
from shop_orders as so 
    join shop_orders_data as sod on sod.orders_id = so.id 
    join (select orders_id 
      from shop_orders_products as sop 
        join shop_products as sp on sp.id = sop.products_id 
      where sp.artno = '120000' 
        OR sp.name like '%120000%') as sop on sop.orders_id = so.id 
where 
    sod.closed = '1' 
order by so.created desc 

Answer 2

是的，你是在正確的道路上 - 你可以只是所有這些表，而不是這些在運營商之間的內部連接。

SELECT 
    so.* 
FROM 
    shop_orders so 
    INNER JOIN shop_orders_data sod 
     ON so.id = sod.orders_id 
    INNER JOIN shop_orders_products sop 
     ON sod.id = sop.orders_id 
    INNER JOIN shop_products sp 
     ON sop.products_id = sp.id 
WHERE sod.closed = '1' 
    AND (sp.artno = '120000' OR sp.name LIKE '%120000%') 

Answer 3

我想這應該這樣做：

SELECT 
    s.* 
FROM 
    shop_orders s 
INNER JOIN 
    shop_orders_data od 
ON 
    s.id=od.orders_id 
INNER JOIN 
    shop_orders_products sop 
ON 
    s.id=sop.orders_id 
INNER JOIN 
    shop_products sp 
ON 
    sop.products_id=sp.id 
WHERE 
    od.closed=1 
AND 
    (sp.artno='120000' or sp.name LIKE '%120000%') 

Answer 4

我要說喜歡的是這裏造成的最大延遲......將在貨號不夠？ LIKE通常是一個非常昂貴的過程。