db2_special_columns

Returns a result set listing the unique row identifier columns for a table

&reftitle.description; `resource` `db2_special_columns` `resource` `connection` ``string``null```qualifier` `string` `schema` `string` `table_name` `int` `scope`

Returns a result set listing the unique row identifier columns for a table.

&reftitle.parameters;

`connection`

- A valid connection to an IBM DB2, Cloudscape, or Apache Derby database.

`qualifier`

- A qualifier for DB2 databases running on OS/390 or z/OS servers. For other databases, pass &null; or an empty string.

`schema`

- The schema which contains the tables.

`table_name`

- The name of the table.

`scope`

- Integer value representing the minimum duration for which the unique row identifier is valid. This can be one of the following values:

  Integer value | SQL constant | Description
  0 | SQL_SCOPE_CURROW | Row identifier is valid only while the cursor is positioned on the row.
  1 | SQL_SCOPE_TRANSACTION | Row identifier is valid for the duration of the transaction.
  2 | SQL_SCOPE_SESSION | Row identifier is valid for the duration of the connection.

&reftitle.returnvalues;

Returns a statement resource with a result set containing rows with unique row identifier information for a table. The rows are composed of the following columns:

Column name | Description
SCOPE |

Integer value | SQL constant | Description
0 | SQL_SCOPE_CURROW | Row identifier is valid only while the cursor is positioned on the row.
1 | SQL_SCOPE_TRANSACTION | Row identifier is valid for the duration of the transaction.
2 | SQL_SCOPE_SESSION | Row identifier is valid for the duration of the connection.

COLUMN_NAME | Name of the unique column.
DATA_TYPE | SQL data type for the column.
TYPE_NAME | Character string representation of the SQL data type for the column.
COLUMN_SIZE | An integer value representing the size of the column.
BUFFER_LENGTH | Maximum number of bytes necessary to store data from this column.
DECIMAL_DIGITS | The scale of the column, or &null; where scale is not applicable.
NUM_PREC_RADIX | An integer value of either `10` (representing an exact numeric data type), `2` (representing an approximate numeric data type), or &null; (representing a data type for which radix is not applicable).
PSEUDO_COLUMN | Always returns 1.

&reftitle.seealso;

- `db2_column_privileges`
- `db2_columns`
- `db2_foreign_keys`
- `db2_primary_keys`
- `db2_procedure_columns`
- `db2_procedures`
- `db2_statistics`
- `db2_table_privileges`
- `db2_tables`