db_drop_primary_key
function db_drop_primary_key
db_drop_primary_key($table)
Drops the primary key of a database table.
Parameters
$table: Name of the table to be altered.
Return value
bool TRUE if the primary key was successfully dropped, FALSE if there was no primary key on this table to begin with.
Deprecated
as of Drupal 8.0.x, will be removed in Drupal 9.0.0. Instead, get a database connection injected into your service from the container, get its schema driver, and call dropPrimaryKey() on it. For example, $injected_database->schema()->dropPrimaryKey($table);