将秒数舍入到 MySQL 中最近的半分钟?
若要将秒数舍入到最近的半分钟,可使用 CEILING()。我们首先创建一张表 −
mysql> create table DemoTable (secondValue int); Query OK, 0 rows affected (0.64 sec)
示例
使用插入命令在表中插入一些记录 −
mysql> insert into DemoTable values(27); Query OK, 1 row affected (0.24 sec) mysql> insert into DemoTable values(56); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values(118); Query OK, 1 row affected (0.20 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
输出
+-------------+ | secondValue | +-------------+ | 27 | | 56 | | 118 | +-------------+ 3 rows in set (0.00 sec)
以下是进行舍入的查询 −
mysql> select secondValue, CEILING(secondValue / 30) / 2 AS ApproxMinutes from DemoTable;
输出
+-------------+---------------+ | secondValue | ApproxMinutes | +-------------+---------------+ | 27 | 0.5000 | | 56 | 1.0000 | | 118 | 2.0000 | +-------------+---------------+ 3 rows in set (0.00 sec)
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