Null value in a column

Question

i have few master tables in my database.
Each master table has few records in it.
Now i have to display all the columns which have a null value and this needs to be done by checking each record in that table.
if there is any null value column for any row then it should be displyed.
How it can be done using pl sql block?

Answer 1

Hi,
Are you looking something like this...
SQL> Create Or Replace Procedure Column_Test(pTableName In Varchar2)
  2  As
  3   vSQLString Varchar2(32000);
  4   vCounter Number := 1;
  5   vNullable Number;
  6  Begin
  7   For r In
  8   (
  9    Select  COLUMN_NAME
10    From USER_TAB_COLS
11    Where TABLE_NAME  = pTableName
12    And NULLABLE  ='Y'
13   )
14   Loop
15   vSQLSTRING := 'SELECT Count(*) FROM ' || DBMS_ASSERT.sql_object_name(pTableName) || ' WHERE ';
16     vSQLSTRING := vSQLSTRING || r.COLUMN_NAME || ' IS NULL And Rownum<=1';
17   Execute Immediate vSQLSTRING Into vNullable;
18   If vNullable>0 Then
19   Dbms_Output.put_Line(r.COLUMN_NAME);
20   End If;
21   End Loop;
22  End;
23  /
Procedure created.
SQL> execute column_test('EMP');
EMAIL
MGR
PL/SQL procedure successfully completed.
SQL>