code: function() {
  		var query = this.query;
  		var args = [];
  		var text = "ALTER TABLE ";
  		if (query.table) text += lib.builder.makeStr(query,"table","");
  		if (query.rename) text += lib.builder.makeStr(query,"rename"," RENAME TO ");
  		if (query.add) text += lib.builder.makeAdd(query);
  		if (query.drop) text += lib.builder.makeDrop(query);
  		return {
  			type: "alter",
  			text: text,
  			args: args,
  		};
  	}
docs: .toQuery()