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Legal Studies用“10/12/2010”這樣的日期格式獲取特定年份的表中記錄？
要使用特定年份來更新記錄，請按以下語法使用 YEAR() 方法
update yourTableName set yourColumnName1=yourValue1 where YEAR(str_to_date(yourColumnName2,'%d/%m/%Y'))=yourValue2;
我們先建立一個表 -
mysql> create table DemoTable1924 ( UserName varchar(20), UserJoiningDate varchar(40) ); Query OK, 0 rows affected (0.00 sec)
使用 insert 命令在表中插入一些記錄 -
mysql> insert into DemoTable1924 values('Chris','10/12/2010');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1924 values('David','20/01/2011');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1924 values('Mike','20/01/2010');
Query OK, 1 row affected (0.00 sec)
mysql> insert into DemoTable1924 values('Carol','26/04/2013');
Query OK, 1 row affected (0.00 sec)使用 select 語句顯示錶中的所有記錄 -
mysql> select * from DemoTable1924;
這將生成以下輸出 -
+----------+-----------------+ | UserName | UserJoiningDate | +----------+-----------------+ | Chris | 10/12/2010 | | David | 20/01/2011 | | Mike | 20/01/2010 | | Carol | 26/04/2013 | +----------+-----------------+ 4 rows in set (0.00 sec)
以下是按特定年份更新記錄的查詢 -
mysql> update DemoTable1924 set UserName='Robert' where YEAR(str_to_date(UserJoiningDate,'%d/%m/%Y'))=2010; Query OK, 2 rows affected (0.00 sec) Rows matched: 2 Changed: 2 Warnings: 0
讓我們再次查看錶記錄 -
mysql> select * from DemoTable1924;
這將生成以下輸出 -
+----------+-----------------+ | UserName | UserJoiningDate | +----------+-----------------+ | Robert | 10/12/2010 | | David | 20/01/2011 | | Robert | 20/01/2010 | | Carol | 26/04/2013 | +----------+-----------------+ 4 rows in set (0.00 sec)
更新於: 30-Dec-2019
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