过滤数据表格特定条件以消除特定记录(使用 MySQL)
为此,可以使用 NOT LIKE 运算符。我们首先创建一个表格 -
mysql> create table DemoTable -> ( -> StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> StudentName varchar(20), -> StudentAdmissionYear varchar(20) -> ); Query OK, 0 rows affected (1.22 sec)
使用 insert 命令在表格中插入一些记录 -
mysql> insert into DemoTable(StudentName,StudentAdmissionYear) values('Chris','2017');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(StudentName,StudentAdmissionYear) values('David','2015');
Query OK, 1 row affected (0.14 sec)
mysql> insert into DemoTable(StudentName,StudentAdmissionYear) values('Bob','2019');
Query OK, 1 row affected (0.18 sec)
mysql> insert into DemoTable(StudentName,StudentAdmissionYear) values('Carol','2015');
Query OK, 1 row affected (0.11 sec)
mysql> insert into DemoTable(StudentName,StudentAdmissionYear) values('Sam','2018');
Query OK, 1 row affected (0.12 sec)使用 select 语句从表格中显示所有记录 -
mysql> select *from DemoTable;
这将产生以下输出 -
+-----------+-------------+----------------------+ | StudentId | StudentName | StudentAdmissionYear | +-----------+-------------+----------------------+ | 1 | Chris | 2017 | | 2 | David | 2015 | | 3 | Bob | 2019 | | 4 | Carol | 2015 | | 5 | Sam | 2018 | +-----------+-------------+----------------------+ 5 rows in set (0.00 sec)
以下是过滤数据表格特定条件以消除特定记录的查询 -
mysql> select *from DemoTable -> where StudentAdmissionYear not like '%2015%';
这将产生以下输出。在这里,我们消除了 StudentAdmissionYear 2015 的记录 -
+-----------+-------------+----------------------+ | StudentId | StudentName | StudentAdmissionYear | +-----------+-------------+----------------------+ | 1 | Chris | 2017 | | 3 | Bob | 2019 | | 5 | Sam | 2018 | +-----------+-------------+----------------------+ 3 rows in set (0.04 sec)
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