如何在MySQL查询中将日期YYYYMMDD转换为YY-MM-DD?
要将MySQL中的日期YYYYMMDD转换为YY-MM-DD,请使用以下语法-
select date_format(str_to_date(yourColumnName, '%Y%m%d'),'%Y-%m-%d') from yourTableName;
让我们首先创建一个表-
mysql> create table DemoTable(
ClientId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
ClientProjectDeadline varchar(200)
);
使用insert命令在表中插入一些记录。我们以YYYYMMDD格式插入了日期-
mysql> insert into DemoTable(ClientProjectDeadline) values('20121221');mysql> insert into DemoTable(ClientProjectDeadline) values('20190416');
mysql> insert into DemoTable(ClientProjectDeadline) values('20160624');
mysql> insert into DemoTable(ClientProjectDeadline) values('20170131');
以下是使用select语句显示表中所有记录的查询-
mysql> select *from DemoTable;
这将产生以下输出-
+----------+-----------------------+| ClientId | ClientProjectDeadline |
+----------+-----------------------+
| 1 | 20121221 |
| 2 | 20190416 |
| 3 | 20160624 |
| 4 | 20170131 |
+----------+-----------------------+
4 rows in set (0.00 sec)
以下是在MySQL中将日期YYYYMMDD转换为YY-MM-DD的查询-
mysql> select date_format(str_to_date(ClientProjectDeadline, '%Y%m%d'),'%Y-%m-%d') from DemoTable;
这将产生以下输出-
+----------------------------------------------------------------------+| date_format(str_to_date(ClientProjectDeadline, '%Y%m%d'),'%Y-%m-%d') |
+----------------------------------------------------------------------+
| 2012-12-21 |
| 2019-04-16 |
| 2016-06-24 |
| 2017-01-31 |
+----------------------------------------------------------------------+
4 rows in set (0.05 sec)
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