从具有日期值的列中检索单个MySQL查询中的MIN和MAX日期
为此，您可以使用聚合函数MIN()和MAX()。让我们首先创建一个表-
mysql> create table DemoTable(AdmissionDate date);
使用插入命令在表中插入一些记录-
mysql> insert into DemoTable values('2019-01-21');
mysql> insert into DemoTable values('2018-12-31');
mysql> insert into DemoTable values('2016-11-01');
mysql> insert into DemoTable values('2019-04-11');
mysql> insert into DemoTable values('2016-02-01');使用select语句显示表中的所有记录-
mysql> select *from DemoTable;
这将产生以下输出-
+---------------+ | AdmissionDate | +---------------+ | 2019-01-21 | | 2018-12-31 | | 2016-11-01 | | 2019-04-11 | | 2016-02-01 | +---------------+ 5 rows in set (0.00 sec)
以下是在单个查询中检索MIN和MAX日期的查询-
mysql> select MIN(AdmissionDate) AS MinDate,MAX(AdmissionDate) AS MaxDate from DemoTable;
这将产生以下输出-
+------------+------------+ | MinDate | MaxDate | +------------+------------+ | 2016-02-01 | 2019-04-11 | +------------+------------+ 1 row in set (0.00 sec)