mysql update 字段select 内容

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UPDATE hm_opportunities
INNER JOIN (
	SELECT
		id,
		SUBSTRING_INDEX(opportunity_city, '-', 1) AS province
	FROM
		hm_opportunities
) b ON hm_opportunities.id = b.id
SET hm_opportunities.province = b.province;
UPDATE hm_opportunities
INNER JOIN (
	SELECT
		id,
		SUBSTRING_INDEX(opportunity_city, '-', -1) AS city
	FROM
		hm_opportunities
) b ON hm_opportunities.id = b.id
SET hm_opportunities.city = b.city;

• 更新某个字段,根据查找的字段值
• update tb inner join (select) on contidions set field=value