WP_Tax_Query::get_sql_clauses() WordPress Method

The WordPress Tax Query is a powerful tool that allows you to create complex SQL queries to retrieve data from the WordPress database. The Tax Query can be used to query any taxonomy, including custom taxonomies. The Tax Query can be used to retrieve data from multiple taxonomies, including child and parent taxonomies. The Tax Query can also be used to retrieve data from multiple terms in a taxonomy.

WP_Tax_Query::get_sql_clauses() #

	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;
	}