摘要:
select T.timehour,count(T.es_out_in_id) as number from(select o.es_out_in_id, DATE_FORMAT(create_time,'%H') as timehour from t_tm_eq_scan_record as o 阅读全文
摘要:
4种方法,都是四舍五入,例: 推荐直接第二种 m2() import java.math.BigDecimal; import java.text.DecimalFormat; import java.text.NumberFormat; public class format { double f 阅读全文