高级MySQL查询:使用其他表中的信息更新表

UPDATE business b, people p
   SET b.email = p.email
 WHERE b.business_id = p.business_id
   AND p.sort_order = '1'
   AND b.email = ''

注意,如果排序顺序是int,则不要使用“1”-使用1:

UPDATE business b
JOIN People p
ON p.business_id = b.business_id
AND p.sort_order = '1'
SET b.email = p.email
WHERE b.email = '';

试试这个,它对我很管用。

Update table a, table b
Set a.importantField = b.importantField,
a.importantField2 = b.importantField2
where a.matchedfield = b.matchedfield;