提高内部连接性能的索引

【问题标题】：Indexes to improve inner joins performance提高内部连接性能的索引
【发布时间】：2022-06-17 21:14:19
【问题描述】：

我有两张桌子：

CREATE TABLE materials (id integer, manufacture character varying, part_number character varying, description character varying)

和

CREATE TABLE suppliers_materials (id integer, material_id integer, supplier_name haracter varying)

有没有办法创建索引来提高以下查询的性能？

SELECT sm.supplier_name FROM materials AS m
INNER JOIN suppliers_materials AS sm ON m.id = sm.material_id
WHERE m.manufacture = 'Blah blah'
GROUP BY sm.supplier_name

【问题讨论】：

• 是的，有。你不确定什么？你读过文档吗？

标签： sql postgresql