UPdate table column + PL/SQL

Hi, I have a question, I have an update query that listed below. It give me an error : 'single-row subquery returns more than one row." Can anyone give me an hint why?

      where BD_NR = (
            select A.NVP_BID_NR from table1  A, table2  B WHERE A.FG_NR = B.FG_NR
              AND A.BD_NR = B.BD_NR
                         AND A.C_CD = 'OU' )
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Jinesh KamdarCommented:
That's because ur inner SELECT query returned more than 1 row for a single row of the table being updated. Since Oracle found multiple rows returned, it couldn't have updated the source table correctly and hence, threw the exception.

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Jinesh KamdarCommented:
ORA-01427: single-row subquery returns more than one row

Cause: The outer query must use one of the keywords ANY, ALL, IN, or NOT IN to specify values to compare because the subquery returned more than one row.

Action: Use ANY, ALL, IN, or NOT IN to specify which values to compare or reword the query so only one row is retrieved.
johnsoneSenior Oracle DBACommented:
I think that you should have IN and not = with the sub-query.
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