# db2_primary_keys

(PECL ibm_db2:1.0-1.6.2)

db2_primary_keys — Returns a result set listing primary keys for a table

### Description

resource db2_primary_keys ( resource `$connection` , string `$qualifier` , string `$schema` , string `$table-name` )

Returns a result set listing the primary keys for a table.

### 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. If `schema` is `NULL`, db2_primary_keys() matches the schema for the current connection.

`table-name`

  The name of the table.

### Return Values

Returns a statement resource with a result set containing rows describing the primary keys for the specified table. The result set is composed of the following columns:

Column name | Description
--- | ---
TABLE_CAT | Name of the catalog for the table containing the primary key. The value is NULL if this table does not have catalogs.
TABLE_SCHEM | Name of the schema for the table containing the primary key.
TABLE_NAME | Name of the table containing the primary key.
COLUMN_NAME | Name of the column containing the primary key.
KEY_SEQ | 1-indexed position of the column in the key.
PK_NAME | The name of the primary key.

### See Also

- db2_column_privileges()
- db2_columns()
- db2_foreign_keys()
- db2_procedure_columns()
- db2_procedures()
- db2_special_columns()
- db2_statistics()
- db2_table_privileges()
- db2_tables()