我对MYSQL刚起步，并且通常编写查询。 此查询中最重要的事情是cycle_count_id和位置。所有信息都应基于这两个因素。 现在，我该如何改善此查询：
SELECT c2.code_cycle_count, c2.location, c2.last_cyclecount, c2.second_recent_cyclecount ,i.uid,c2.po_number, i.cost, i.uid
, (SELECT
CASE WHEN MAX(cc.updated_at) = MAX(ccc.updated_at) THEN u.username ELSE NULL END
from oms_live_ir.wms_cycle_count ccc
INNER JOIN oms_live_ir.ims_user u ON u.id_user=ccc.fk_user
WHERE ccc.fk_location = cc.fk_location AND ccc.id_cycle_count=cc.id_cycle_count) AS cycle_count_user
, (SELECT COUNT(cci.fk_cycle_count_item_status)
from oms_live_ir.wms_cycle_count_item cci
WHERE cci.fk_cycle_count_item_status = 1 AND cc.id_cycle_count=cci.fk_cycle_count) AS location_updated
, (SELECT COUNT(cci.fk_cycle_count_item_status)
from oms_live_ir.wms_cycle_count_item cci
WHERE cci.fk_cycle_count_item_status = 2 AND cc.id_cycle_count=cci.fk_cycle_count) AS status_updated
, (SELECT COUNT(cci.fk_cycle_count_item_status)
from oms_live_ir.wms_cycle_count_item cci
WHERE cci.fk_cycle_count_item_status = 4 AND cc.id_cycle_count=cci.fk_cycle_count) AS found
, (SELECT COUNT(cci.fk_cycle_count_item_status)
from oms_live_ir.wms_cycle_count_item cci
WHERE cci.fk_cycle_count_item_status = 6 AND cc.id_cycle_count=cci.fk_cycle_count) AS lost
, c5.id_pick, c5.date_pick
FROM oms_live_ir.wms_cycle_count cc
INNER JOIN oms_live_ir.wms_inventory i on i.fk_location=cc.fk_location
INNER join
(SELECT l.description AS location
,MAX(cccc.id_cycle_count) AS code_cycle_count
,MAX(cccc.updated_at) AS last_cyclecount, i.po_number
,(SELECT MAX(c1.updated_at) FROM oms_live_ir.wms_cycle_count c1 WHERE c1.updated_at<>MAX(cccc.updated_at)
AND c1.fk_location=cccc.fk_location) as second_recent_cyclecount
FROM oms_live_ir.wms_cycle_count cccc
INNER JOIN oms_live_ir.wms_inventory i ON i.fk_location=cccc.fk_location
INNER JOIN oms_live_ir.ims_location l ON l.id_location=cccc.fk_location
WHERE year(cccc.updated_at)>=2018 AND month(cccc.updated_at)>=1
AND LEFT(i.po_number,2) LIKE 'M1%' or LEFT(i.po_number,2) LIKE 'S1%'
GROUP by cccc.fk_location
) c2 on c2.code_cycle_count= cc.id_cycle_count
INNER JOIN
(SELECT cc5.fk_location,
(SELECT CASE WHEN ih2.updated_at=MIN(ih2.updated_at) THEN ih2.sales_order_item_id ELSE NULL END
FROM oms_live_ir.wms_cycle_count cc2
INNER JOIN oms_live_ir.wms_inventory_history ih2 ON ih2.fk_location=cc2.fk_location
WHERE ih2.sales_order_item_id=ih5.sales_order_item_id AND ih2.fk_location=cc5.fk_location AND cc2.id_cycle_count=cc5.id_cycle_count
AND year(ih2.updated_at)>=2018 AND MONTH(ih2.updated_at)>=1 AND ih2.sales_order_item_id IS NOT NULL
GROUP BY ih2.id_inventory) id_pick
,(SELECT CASE WHEN ih2.updated_at=MIN(ih2.updated_at) THEN ih5.updated_at ELSE NULL END
FROM oms_live_ir.wms_cycle_count cc2
INNER JOIN oms_live_ir.wms_inventory_history ih2 ON ih2.fk_location=cc2.fk_location
WHERE ih2.sales_order_item_id=ih5.sales_order_item_id AND ih2.fk_location=cc5.fk_location AND cc2.id_cycle_count=cc5.id_cycle_count
AND year(ih2.updated_at)>=2018 AND MONTH(ih2.updated_at)>=1 AND ih2.sales_order_item_id
GROUP BY ih2.id_inventory) date_pick
FROM oms_live_ir.wms_cycle_count cc5
INNER JOIN oms_live_ir.wms_inventory_history ih5 ON ih5.fk_location=cc5.fk_location
WHERE year(ih5.updated_at)>=2018 AND MONTH(ih5.updated_at)>=1 AND ih5.sales_order_item_id IS NOT NULL) c5 ON c5.fk_location=cc.fk_location
WHERE year(cc.updated_at)>=2017 AND month(cc.updated_at)>=1
AND LEFT(i.po_number,2) LIKE 'M1%' or LEFT(i.po_number,2) LIKE 'S1%'
group by c2.code_cycle_count, c2.location;
（注意：我无权创建临时表或为表创建索引。）
谢谢。