drds 分表分庫中兩種寫法結果不一致

select created_at from `yy_cps_pay_log` where (`created_at` > '2019-01-01 00:00:00' and `created_at` < '2019-01-01 23:59:59');   select created_at from `yy_cps_pay_log` where year(`created_at`) = '201

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