Question

MERGE INTO table_1 a   
USING      
 (SELECT * from table_2) b  ON ( a.row_id = b.row_id and a.in_correct IS NULL) 
WHEN MATCHED THEN UPDATE SET a.in_correct = 'Y'; 

In the above query ORA-38104:Column referenced in ON clause cannot be updated.

I have been sitting for hours to resolve this.

I have identified that the problem is the field in_correct.

This field “in_correct” cannot be put in both ON clause and also after SET. But in order satisfy my criteria,I have no option.

Please help me out

Answer 1

MERGE INTO table_1 a USING
    (SELECT * from table_2) b 
ON ( a.row_id = b.row_id) 
WHEN MATCHED THEN UPDATE 
  SET a.in_correct = NVL(in_correct, 'Y');

UPDATE:

A more “general” command (for non null values):

MERGE INTO table_1 a USING
    (SELECT * from table_2) b 
ON ( a.row_id = b.row_id) 
WHEN MATCHED THEN UPDATE 
  SET a.in_correct = case 
                 when in_correct = 'valuetobereplaced' then 'Y'; 
                 else in_correct; 
                 end;