sum method

Future<num?> sum(
  1. String column
)

Get sum of a column

Implementation

Future<num?> sum(String column) async {
  final sql = _buildAggregateSql('SUM', column);
  final result = await repository.connection.query(sql, parameters: _params);
  if (result.isEmpty) return null;
  final value = result.first['sum_value'];
  return value != null ? (value as num) : null;
}