Source

File: wp-includes/wp-db.php

public function get_charset_collate() {
		$charset_collate = '';

		if ( ! empty( $this->charset ) ) {
			$charset_collate = "DEFAULT CHARACTER SET $this->charset";
		}
		if ( ! empty( $this->collate ) ) {
			$charset_collate .= " COLLATE $this->collate";
		}

		return $charset_collate;
	}