STR_TO_DATE 作为列，但未找到列?
mysqlmysqli database
您可以使用 having 子句。让我们首先创建一个表 −
mysql> create table DemoTable -> ( -> AdmissionDate varchar(100) -> ); Query OK, 0 rows affected (0.55 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values('10/12/2017');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable values('01/11/2018');
Query OK, 1 row affected (0.12 sec)
mysql> insert into DemoTable values('31/01/2019');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable values('09/06/2019');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable values('19/04/2019');
Query OK, 1 row affected (0.23 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
输出
+---------------+ | AdmissionDate | +---------------+ | 10/12/2017 | | 01/11/2018 | | 31/01/2019 | | 09/06/2019 | | 19/04/2019 | +---------------+ 5 rows in set (0.00 sec)
以下是对 STR_TO_DATE 作为列的查询 −
mysql> select STR_TO_DATE(AdmissionDate, '%d/%m/%Y') as newDate from DemoTable -> having newDate >= '2019-01-01';
输出
+------------+ | newDate | +------------+ | 2019-01-31 | | 2019-06-09 | | 2019-04-19 | +------------+ 3 rows in set (0.00 sec)
