Optimizing query in mysql more efficient

Question

Please look at my query and execution plan I have added index in most of the table, but when I am joining it taking primary key and foreign key index. I am taking only 50 records.

it is taking 5-7 seconds.

How can I optimize this more efficient manner.

Answer 1

您可以在表boxes列po_id中添加索引，也可以将派生表的claim_notes转换为子查询

(SELECT MAX(claim_status_id) FROM claim_notes WHERE item_id = items.id) AS claim_status_id