查询生成器 returns 不正确的日期时间比较查询结果

query builder returns incorrect datetime compare query results

我有这个查询:

return DB::table('electricity_meters')
->where('electricity_meters.id', 16)
->leftJoin('service_instances', 'service_instances.electricity_meter_id', '=', 'electricity_meters.id')
->leftJoin('readings', 'electricity_meters.kwh_param_id', '=', 'readings.parameter_id')
->where('readings.taken_at', '>', 'service_instances.active_to')
->select([
    'readings.taken_at',
    'service_instances.active_to',
])
->get();

关注'readings.taken_at', '>', 'service_instances.active_to',但不知何故结果...

[
    {
        taken_at: "2021-02-16 23:59:59",
        active_to: "2021-03-28"
    },
    ...
]

我在这里错过了什么?

我想你想比较两列,如果那样的话,你应该使用 whereColumn:

return DB::table('electricity_meters')
->where('electricity_meters.id', 16)
->leftJoin('service_instances', 'service_instances.electricity_meter_id', '=', 'electricity_meters.id')
->leftJoin('readings', 'electricity_meters.kwh_param_id', '=', 'readings.parameter_id')
->whereColumn('readings.taken_at', '>', 'service_instances.active_to')
->select([
    'readings.taken_at',
    'service_instances.active_to',
])
->get();