mysql把一个表某个字段的内容复制到另一张表的某

UPDATE file_manager_folder f1
LEFT OUTER JOIN file_manager_folder f2
    ON f1.name = f2.name AND f2.parentId = 54
SET f1.parentId = 54
WHERE f2.name IS NULL AND f1.id IN (1,2,3);

update B set extra = A.extra from A join B on (A.id = B.id);

update b set b.sms = (select a.sms from a where a.id = b.id)

UPDATE A SET A.SMS = (SELECT B.SMS FROM B WHERE A.ID = B.ID) WHERE EXISTS (SELECT 1 FROM B WHERE A.ID = B.ID);

UPDATE tb_1 INNER JOIN tb_2 ON tb_1.tid = tb_2.tid
SET tb_1.tcontent = tb_2.tcontent

update article set B=A;

UPDATE tb_1 SET content_target = content_source;

Update {your_table} set {source_field} = {object_field} WHERE cause