MySQL 查询检查字符串是否在同一行中包含值(子字符串)?
mysqlmysqli database
由于我们需要匹配同一行中的字符串,因此使用 LIKE 运算符。让我们首先创建一个表 −
mysql> create table DemoTable ( FirstName varchar(100), FullName varchar(100) ); Query OK, 0 rows affected (0.53 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values('John','John Smith'); Query OK, 1 row affected (0.08 sec) mysql> insert into DemoTable values('David','John Miller'); Query OK, 1 row affected (0.14 sec) mysql> insert into DemoTable values('Bob','Sam Miller'); Query OK, 1 row affected (0.18 sec) mysql> insert into DemoTable values('Chris','Chris Brown'); Query OK, 1 row affected (0.10 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
这将产生以下输出 −
+-----------+-------------+ | FirstName | FullName | +-----------+-------------+ | John | John Smith | | David | John Miller | | Bob | Sam Miller | | Chris | Chris Brown | +-----------+-------------+ 4 rows in set (0.00 sec)
以下查询用于检查字符串是否在同一行中包含值 −
mysql> select FirstName,FullName from DemoTable where FullName LIKE concat('%', FirstName, '%');
这将产生以下输出 −
+-----------+-------------+ | FirstName | FullName | +-----------+-------------+ | John | John Smith | | Chris | Chris Brown | +-----------+-------------+ 2 rows in set (0.00 sec)