SQL to update two columns in TABLE2 from TABLE1

I know this is a simple question for some of you, but I am new to SQLs, so please help...
I have two tables TABLE1 & TABLE2 as below, both tables contains more then 50million records:
SELECT * FROM TABLE1.
ID                        BUS_FID                WORKID                  STATIONID
28400000117234         245                    13461428.25           16520877.8
28400000117513         403                    13461428.25           16520877.8
28400000117533         423                    13461428.25           16520877.8
28400000117578         468                    13461428.25           16520877.8
28400000117582         472                    13461428.25           16520877.8
SELECT * FROM TABLE2.
BUS_FID                    ID                 TRPELID                RELPOS                 WORKID                 STATIONID
114                    28400000117658         28400000035396         23.225
115                    28400000117659         28400000035396         23.225
116                    28400000117660         28400000035396         23.225
117                    28400000117661         28400000035396         23.225
118                    28400000117662         28400000035396         23.225
119                    28400000117663         28400000035396         23.225
120                    28400000117664         28400000035396         23.225
121                    28400000117665         28400000035396         23.225
122                    28400000117666         28400000035396         23.225
123                    28400000117667         28400000035396         23.225
124                    28400000117668         28400000035396         23.225
125                    28400000117669         28400000035396         23.225
126                    28400000117670         28400000035396         23.225    Now I tried to use following SQL to update WORKID & STATIONID columns in TABLE2 but failed. BUS_FID in both tables have been UNIQUE indexed and they can be used as primary keys to join these two tables.
UPDATE (
SELECT p.WORKID px,
          p.STATIONID py,
          p.BUS_FID pid,
          temp.WORKID tempx,
          temp.STATIONID tempy,
          temp.BUS_FID tempid
    FROM TABLE1 temp,
          TABLE2 p
    WHERE pid = tempid
SET px = tempx,
      py = tempy;
COMMIT;with above code, Oracle returned following errors:
SQL Error: ORA-00904: "TEMPID": invalid identifier
00904. 00000 - "%s: invalid identifier"Can anyone help me to correct it? Thanks~~~
BTW, both two tables contains over 50 million records. So, if you have a better SQL to perform the same task, please let me know!
Appreciated your help at advance.

Hi,
984210 wrote:
Tried to change to
p.bus_fid = temp.bus_fidit start running.
Can anyone please explain to me why this is happening? Thanks!!Column aliases (such as pid and tempid in your statement) can't be used in the same query in which they are defined (except in an ORDER BY clause). Elsewhere, you have to refer to the columns by their actual names.

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hi friends
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Thank you Scott,
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What do you mean with "two rows"? May be two columns??
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876466 wrote:
Hi
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Also post the results you want from that data, and an explanation of how you get those results from that data, with specific examples.
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