为什么Access 2013采用了一个非常好的查询:
Select t1.A,t2.b,t3.c
from T1
Inner Join t2 on t2.a = t1.a
Inner Join t3 on t3.a = t1.a
并将其分解为3个不同的工作(会话)
session 1: Select a from t1
Session 2. select b from t2
session 3. select c from t3