Generate SQL clauses to be appended to a main query.

Called by the public WP_Meta_Query::get_sql(), this method is abstracted out to maintain parity with the other Query classes.

string[] Array containing JOIN and WHERE SQL clauses to append to the main query.

• joinstring
  SQL fragment to append to the main JOIN clause.
• wherestring
  SQL fragment to append to the main WHERE clause.

File: wp-includes/class-wp-meta-query.php. View all references

protected function get_sql_clauses() {
	/*
	 * $queries are passed by reference to get_sql_for_query() for recursion.
	 * To keep $this->queries unaltered, pass a copy.
	 */
	$queries = $this->queries;
	$sql     = $this->get_sql_for_query( $queries );

	if ( ! empty( $sql['where'] ) ) {
		$sql['where'] = ' AND ' . $sql['where'];
	}

	return $sql;
}