本文为您介绍如何使用实时计算日期函数HOUR。

语法

BIGINT HOUR(TIME time)
BIGINT HOUR(TIMESTAMP timestamp)    

入参

参数 数据类型
time TIME
timestamp TIMESTAMP

功能描述

返回输入时间参数time或timestamp中的24小时制的小时数,范围0~23。

示例

  • 测试数据
    datetime1(VARCHAR) time1(VARCHAR) time2(TIME) timestamp1(TIMESTAMP)
    2017-10-15 11:12:13 22:23:24 22:23:24 2017-10-15 11:12:13
  • 测试语句
    SELECT HOUR(TIMESTAMP '2016-09-20 23:33:33') AS int1,
     HOUR(TIME '23:30:33') AS int2,
     HOUR(time2) AS int3,
     HOUR(timestamp1) AS int4,
     HOUR(CAST(time1 AS TIME)) AS int5,
     HOUR(TO_TIMESTAMP(datetime1)) AS int6
    FROM T1;              
  • 测试结果
    int1(BIGINT) int2(BIGINT) int3(BIGINT) int4(BIGINT) int5(BIGINT) int6(BIGINT)
    23 23 22 11 22 11