如何查询 MySQL 的当前周数?
mysqlmysqli database
要查询 MySQL 的当前周数，可以使用 YEARWEEK() 函数。
语法如下
SELECT *FROM yourTableName WHERE YEARWEEK(yourDateColumnName) = YEARWEEK(NOW());
为了理解上述语法，让我们创建一个表。创建表的查询如下
mysql> create table currentWeekDemo -> ( -> UserId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> UserName varchar(20), -> UserPostDate date -> ); Query OK, 0 rows affected (0.68 sec)
使用 insert 命令在表中插入一些记录。 查询语句如下 −
mysql> insert into currentWeekDemo(UserName,UserPostDate) values('Carol','2010-01-06');
Query OK, 1 row affected (0.20 sec)
mysql> insert into currentWeekDemo(UserName,UserPostDate) values('Bob','2019-06-04');
Query OK, 1 row affected (0.17 sec)
mysql> insert into currentWeekDemo(UserName,UserPostDate) values('David','2019-03-06');
Query OK, 1 row affected (0.16 sec)
mysql> insert into currentWeekDemo(UserName,UserPostDate) values('Maxwell','2018-04-21');
Query OK, 1 row affected (0.15 sec)
使用 select 语句显示表中的所有记录。查询如下 −
mysql> select *from currentWeekDemo;
以下是输出 −
+--------+----------+--------------+ | UserId | UserName | UserPostDate | +--------+----------+--------------+ | 1 | Carol | 2010-01-06 | | 2 | Bob | 2019-06-04 | | 3 | David | 2019-03-06 | | 4 | Maxwell | 2018-04-21 | +--------+----------+--------------+ 4 rows in set (0.00 sec)
以下是如何查询 MySQL 当前周数
mysql> select *from currentWeekDemo WHERE YEARWEEK(UserPostDate) = YEARWEEK(NOW());
以下是输出 −
+--------+----------+--------------+ | UserId | UserName | UserPostDate | +--------+----------+--------------+ | 3 | David | 2019-03-06 | +--------+----------+--------------+ 1 row in set (0.05 sec)
