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help me in understanding this update statement

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Help needed in understanding the below update statement

Expand|Select|Wrap|Line Numbers
  1. update results_key set 
  3. result = temp.tally
  5. from(
  7.         select testid,result,count(*) as tally
  9.         from reslults_emp
  11.         where testid='e001'
  13.      ) temp
  15. where resluts_key.testid=temp.testid
  17. and results_key.value=temp.result

According to me result expect one and only one value from temp.tally

but it is returning 2 values and the update is working perfectly

updating 2 records.

why I am confused is because I have back ground of Oracle sql plsql and in Oracle

update this is not possible it will give error stating too many rows.

can any body explain me this update statement


Sep 25 '08 #1
1 1183
8,127 Recognized Expert Expert
you need to deeply look into the join part for your answer.
Sep 25 '08 #2

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