MySQL 查询计算字段值中的逗号?
mysqlmysqli database更新于 2024/2/9 16:34:00
以下是语法 −
select length(yourColumnName) - length(replace(yourColumnName, ',', '')) as anyAliasName from yourTableName;
首先我们创建一个表 −
mysql> create table DemoTable1510 -> ( -> Value varchar(50) -> ); Query OK, 0 rows affected (6.75 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable1510 values('20,35');
Query OK, 1 row affected (0.57 sec)
mysql> insert into DemoTable1510 values('45,67,89');
Query OK, 1 row affected (0.99 sec)
mysql> insert into DemoTable1510 values('90,97,101,190');
Query OK, 1 row affected (1.15 sec)
使用 select 语句显示表中的所有记录 −
mysql> select * from DemoTable1510;
这将产生以下输出 −
+---------------+ | Value | +---------------+ | 20,35 | | 45,67,89 | | 90,97,101,190 | +---------------+ 3 rows in set (0.00 sec)
以下查询用于计算字段值中的逗号 −
mysql> select length(Value) - length(replace(Value, ',', '')) as NumberOfComma from DemoTable1510;
这将产生以下输出 −
+---------------+ | NumberOfComma | +---------------+ | 1 | | 2 | | 3 | +---------------+ 3 rows in set (0.00 sec)
