Oracle SQL Update with rowover partition -

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why error b1.employee_id invalid identifier sql below:

update table_1 a1    set a1.addl_seq = ( select seq                          (select row_number() on (partition employee_id                                                          order employee_id, erncd) seq                                 table_1) b1                         b1.employee_id=a1.employee_id );

you can write update statement this:

update     (select employee_id, addl_seq,          row_number() on (partition employee_id order employee_id, erncd) seq    table_1) set addl_seq = seq;

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