我想从mysql中的4个表中检索记录 - 是否有任何替代方法 - 此查询返回所有记录

Question

SELECT * FROM inquiry e，sales_lead sl，customer c，project p where（（e.customer_id = c.customer_id和e.project_id = p.project_id）或e.sales_lead_id = sl.sales_lead_id）和e.delete_status＆lt;大于1

Answer 1

使用以下JOIN查询：

SELECT * FROM enquiry e
LEFT OUTER JOIN sales_lead sl ON e.sales_lead_id=sl.sales_lead_id
LEFT OUTER JOIN customer c ON e.customer_id=c.customer_id
LEFT OUTER JOIN project p ON e.project_id = p.project_id
WHERE e.delete_status <> 1