Passing column name inside an update query

Question

Hi,
To checking if there any number field present in 'ID' column, I am using the follwing query.
UPDATE table1
SET COL1 = 'Y'
WHERE 0 = (
SELECT CASE
WHEN ID IS NULL THEN 1
WHEN REGEXP_LIKE(
ID,
'^( *)(\+|-)?((\d*[' || SUBSTR(VALUE,1,1) || ']?\d+)|(\d+[' ||
SUBSTR(VALUE,1,1) || ']?\d*)){1}(e(\+|-)?\d+)?(f|d)?$','i'
) THEN 1
ELSE 0
END
FROM NLS_SESSION_PARAMETERS
WHERE PARAMETER = 'NLS_NUMERIC_CHARACTERS'
Now I need to extend this query to check 10 more columns from table1. How can modify the above query to pass that 10 columns the above query.
Thanks

Answer 1

Got it ! Then again your syntax is incorrect... You should use correlated subquerry
UPDATE table1
   SET COL1 = 'Y'
WHERE 0 =
          (SELECT CASE
                     WHEN ID IS NULL
                     THEN
                        1
                     WHEN REGEXP_LIKE (
                             table1.id,
                                '^( *)(\+|-)?((\d*['
                             || SUBSTR (VALUE, 1, 1)
                             || ']?\d+)|(\d+['
                             || SUBSTR (VALUE, 1, 1)
                             || ']?\d*)){1}(e(\+|-)?\d+)?(f|d)?$',
                             'i')
                     THEN
                        1
                     ELSE
                        0
                  END
             FROM NLS_SESSION_PARAMETERS
            WHERE PARAMETER = 'NLS_NUMERIC_CHARACTERS')Ok.. Use the following code
BEGIN
   FOR a IN (SELECT column_name
               FROM user_tab_columns
              WHERE table_name = 'TABLE1'           --and COLUMN_NAME in (...)
   LOOP
      EXECUTE IMMEDIATE 'UPDATE table1
   SET COL1 = ''Y''
WHERE 0 =
          (SELECT CASE
                     WHEN ID IS NULL
                     THEN
                        1
                     WHEN REGEXP_LIKE (
                              table1.'
                       || a.column_name
                       || ',
                                ''^( *)(\+|-)?((\d*[''
                             || SUBSTR (VALUE, 1, 1)
                             || '']?\d+)|(\d+[''
                             || SUBSTR (VALUE, 1, 1)
                             || '']?\d*)){1}(e(\+|-)?\d+)?(f|d)?$'',
                             ''i'')
                     THEN
                        1
                     ELSE
                        0
                  END
             FROM NLS_SESSION_PARAMETERS
            WHERE PARAMETER = ''NLS_NUMERIC_CHARACTERS'')';
   END LOOP;
END;
END;The following select generates the list of column you want to use
SELECT column_name
               FROM user_tab_columns
              WHERE table_name = 'TABLE1'And in loop they are using in your querry
a.column_name