在 MySQL 中计算逗号分隔字段的值?
mysqlmysqli database更新于 2023/11/28 0:06:00
您可以使用 MySQL 中的 CHAR_LENGTH() 方法计算逗号分隔字段的值。语法如下 −
SELECT *, (CHAR_LENGTH(yourColumnName) - CHAR_LENGTH(REPLACE(yourColumnName, ',','')) + 1) as anyVariableName from yourTableName;
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 CountValuesCommaSeparated -> ( -> Id int NOT NULL AUTO_INCREMENT, -> CommaSeparatedValue text, -> PRIMARY KEY(Id) -> ); Query OK, 0 rows affected (1.76 sec)
使用 insert 命令在表中插入一些记录。 查询语句如下 −
mysql> insert into CountValuesCommaSeparated(CommaSeparatedValue)
values('101,104,1900,46675,7895');
Query OK, 1 row affected (0.16 sec)
mysql> insert into CountValuesCommaSeparated(CommaSeparatedValue)
values('1010,18949,37465');
Query OK, 1 row affected (0.21 sec)
mysql> insert into CountValuesCommaSeparated(CommaSeparatedValue)
values('2010,1201,2743874,7485');
Query OK, 1 row affected (0.42 sec)
mysql> insert into CountValuesCommaSeparated(CommaSeparatedValue)
values('4757,457587,48586,378575,3874765,487565');
Query OK, 1 row affected (0.26 sec)
使用 select 语句显示表中的所有记录。查询如下 −
mysql> select *from CountValuesCommaSeparated;
以下是输出 −
+----+-----------------------------------------+ | Id | CommaSeparatedValue | +----+-----------------------------------------+ | 1 | 101,104,1900,46675,7895 | | 2 | 1010,18949,37465 | | 3 | 2010,1201,2743874,7485 | | 4 | 4757,457587,48586,378575,3874765,487565 | +----+-----------------------------------------+ 4 rows in set (0.00 sec)
以下是用于计算逗号分隔字段的值的查询:
mysql> select *, -> (CHAR_LENGTH(CommaSeparatedValue) - CHAR_LENGTH(REPLACE(CommaSeparatedValue, ',', '')) + 1) as TotalValue -> from CountValuesCommaSeparated;
以下是输出 −
+----+-----------------------------------------+------------+ | Id | CommaSeparatedValue | TotalValue | +----+-----------------------------------------+------------+ | 1 | 101,104,1900,46675,7895 | 5 | | 2 | 1010,18949,37465 | 3 | | 3 | 2010,1201,2743874,7485 | 4 | | 4 | 4757,457587,48586,378575,3874765,487565 | 6 | +----+-----------------------------------------+------------+ 4 rows in set (0.00 sec)
