请教一下，这两条SQL语句执行效率哪个高点
SELECT T12.*
FROM (T12 LEFT OUTER JOIN T122 ON T12.F1 = T122.F1) LEFT OUTER JOIN T121 ON T12.F1 = T121.F1

SELECT T12.*
FROM T12 LEFT OUTER JOIN T121 ON T12.F1 = T121.F1
  LEFT OUTER JOIN T122 ON T12.F1 = T122.F1

------解决方案--------------------
一样的语句，MYSQL或者其它数据库会对语句进行优化的。