Question

I try to update a table using another table. I get the error number 407. It says that i try to insert a null in a notnullable column.

I checked the column it my_TIMESTAMP column. Normally it can not be null. Because I update the colum,n with current timestamp. It should generate a timestamp. Where is the problem?

    UPDATE table1 mytable
    SET (
      my_PROCESS,
      my_TIMESTAMP,
      col3, 
      COL5
    ) = (
    SELECT
      (select PROCESSNAME from table3),
      current timestamp,
      COL3,
      COL5  
    FROM table2 mytable2
    WHERE mytable.COL4 = mytable2.COL4  
    )
    WHERE EXISTS (
        SELECT 'x'
        FROM table1 mytable1, table2 mytable21
        WHERE mytable1.COL4 = mytable21.COL4            
    );

Answer 1

I replace the where exists condition with where ... IN changed the where condition.

 UPDATE table1 mytable
    SET (
      my_PROCESS,
      my_TIMESTAMP,
      col3, 
      COL5
    ) = (
    SELECT
      (select PROCESSNAME from table3),
      current timestamp,
      COL3,
      COL5  
    FROM table2 mytable2
    WHERE mytable.COL4 = mytable2.COL4  
    )
    WHERE mytable.id IN (
        SELECT mytable1.id
        FROM table1 mytable1, table2 mytable21
        WHERE mytable1.COL4 = mytable21.COL4            
    );