On Wed, Jun 24, 2015 at 8:27 PM, =E5=BE=B7=E5=93=A5 <digoal@126.com> wrote:
> But Why, The same SQL has two diff result?
> It's not a BUG?
>
=E2=80=8BTBH, it might be but the pain I experience in trying to decipher y=
our
example is too great for me to know for sure.
If you cannot simplify it even further I would suggest some improvements.
1. choose better data values and less complexity on the where/joins
2. avoid having CTE names that match up with your table names
3. minimize the table count altogether (i.e, 1) and simply use constants in
your where/joins
Note that #2 above may be why you are confused....
with t(c1,c2) as (update t1 set id=3Dt2.id from t2 where t1.info=3Dt2.info
returning t1.id,t1.info), t2(c3,c4) as (update t1 set info=3Dt3.info from t=
3
where t1.id=3Dt3.id returning t1.id,t1.info) select * from t,t2;
You may also want to write more commentary, especially regarding what you
are expecting versus what you are seeing.
David J.
