MySQL 查询以特定字母开头的记录
mysqlmysqli database更新于 2023/11/11 18:15:00
首先我们创建一个表 −
mysql> create table DemoTable775 ( FirstName varchar(100) ); Query OK, 0 rows affected (0.78 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable775 values('Adam') ;
Query OK, 1 row affected (0.17 sec)
mysql> insert into DemoTable775 values('Carol');
Query OK, 1 row affected (0.22 sec)
mysql> insert into DemoTable775 values('John');
Query OK, 1 row affected (0.16 sec)
mysql> insert into DemoTable775 values('Sam');
Query OK, 1 row affected (0.19 sec)
mysql> insert into DemoTable775 values('Adan');
Query OK, 1 row affected (0.15 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable775;
这将产生以下输出 -
+-----------+ | FirstName | +-----------+ | Adam | | Carol | | John | | Sam | | Adan | +-----------+ 5 rows in set (0.00 sec)
以下是统计以特定字母开头的记录的查询 -
mysql> select count(*),substring(FirstName,1,2) from DemoTable775 group by substring(FirstName,1,2);
这将产生以下输出 -
+----------+--------------------------+ | count(*) | substring(FirstName,1,2) | +----------+--------------------------+ | 2 | Ad | | 1 | Ca | | 1 | Jo | | 1 | Sa | +----------+--------------------------+ 4 rows in set (0.00 sec)
