abstract public Schema::dropPrimaryKey($table)
Drop the primary key.
$table: The table to be altered.
TRUE if the primary key was successfully dropped, FALSE if there was no primary key on this table to begin with.
abstract public function dropPrimaryKey($table);
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https://api.drupal.org/api/drupal/core!lib!Drupal!Core!Database!Schema.php/function/Schema::dropPrimaryKey/8.1.x