在一个查询中加入 2 个选择

Question

如何在一个查询中加入这 2 个选择？

SELECT st.tracking_id FROM sale_order_line_tracking AS st, sale_order_line AS sol 
WHERE st.order_line_id = sol.id
AND sol.id in %s;

SELECT rsolp.pack_id from rp_sale_order_line_pack AS rsolp, sale_order_line AS sol
WHERE rsolp.sale_line_id = sol.id
AND sol.id in %s;  

Answer 1

如果要合并来自两个不同查询的两个结果，可以使用UNION语法：

SELECT st.tracking_id FROM sale_order_line_tracking AS st, sale_order_line AS sol 
WHERE st.order_line_id = sol.id
AND sol.id in %s
UNION
SELECT rsolp.pack_id from rp_sale_order_line_pack AS rsolp, sale_order_line AS sol
WHERE rsolp.sale_line_id = sol.id
AND sol.id in %s;

这将返回一个结果表，但您的查询彼此太相似，因此更好的选择是JOIN

Answer 2

您可以尝试使用 JOIN

SELECT st.tracking_id,rsolp.pack_id
FROM sale_order_line_tracking AS st join sale_order_line AS sol 
on st.order_line_id = sol.id join rp_sale_order_line_pack AS rsolp
on rsolp.sale_line_id = sol.id
AND sol.id in %s;

Answer 3

以下可以是连接查询之一。 但是现在取决于您是否想要 LEFT 或 RIGHT 连接，因此您可以修改查询。

您还可以更改是先使用跟踪表还是先使用销售订单表的顺序，以使其与您的业务案例相关。

SELECT st.tracking_id,rsolp.pack_id
    FROM sale_order_line_tracking AS st Join sale_order_line AS sol 
        on st.order_line_id = sol.id 
        Join rp_sale_order_line_pack AS rsolp on rsolp.sale_line_id = sol.id
WHERE sol.id in %s;

Answer 4

做一个双LEFT JOIN ：

SELECT sol.*, st.tracking_id, rsolp.pack_id
FROM sale_order_line AS sol 
LEFT JOIN sale_order_line_tracking AS st
    ON st.order_line_id = sol.id
LEFT JOIN rp_sale_order_line_pack AS rsolp
    ON rsolp.sale_line_id = sol.id
WHERE sol.id in %s;

Answer 5

你需要以这种方式运行：

SELECT st.tracking_id FROM sale_order_line_tracking AS st, sale_order_line AS sol 
WHERE st.order_line_id = sol.id
AND sol.id in %s
UNION
SELECT rsolp.pack_id from rp_sale_order_line_pack AS rsolp, sale_order_line AS sol
WHERE rsolp.sale_line_id = sol.id
AND sol.id in %s;