Sql Server 与 MySql 在使用 update inner join 时的区别

-- 不使用别名
UPDATE
tb_User
SET
tb_User.pass = ''
FROM
tb_User usr
INNER JOIN
tb_Address addr
ON
usr.nAddressFK = addr.nAddressID
WHERE
usr.id=123

-- 使用别名
UPDATE
usr
SET
usr.pass = ''
FROM
tb_User usr
INNER JOIN
tb_Address addr
ON
usr.nAddressFK = addr.nAddressID
WHERE
usr.id=123

UPDATE
mem_world AS mw1
INNER JOIN
mem_world AS mw2
ON
mw1.parentid = mw2.wid
SET
mw1.level = mw2.level
WHERE
mw2.baseid = 107
AND
mw2.parentid = 0
AND
mw2.size > 1