在 MySQL 中获取字段值小于 5 个字符的行?
mysqlmysqli database更新于 2024/12/17 22:04:17
要获取字段值小于 5 个字符的行，您需要使用 LENGTH() 函数。语法如下 −
SELECT *FROM yourTableName WHERE LENGTH(yourColumnName) < 5;
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 fieldLessThan5Chars -> ( -> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> yourZipCode varchar(10) -> ); Query OK, 0 rows affected (0.52 sec)
现在，您可以使用 insert 命令在表中插入一些记录。查询如下 −
mysql> insert into fieldLessThan5Chars(yourZipCode) values('35801');
Query OK, 1 row affected (0.10 sec)
mysql> insert into fieldLessThan5Chars(yourZipCode) values('3580');
Query OK, 1 row affected (0.20 sec)
mysql> insert into fieldLessThan5Chars(yourZipCode) values('90001');
Query OK, 1 row affected (0.40 sec)
mysql> insert into fieldLessThan5Chars(yourZipCode) values('100');
Query OK, 1 row affected (0.20 sec)
mysql> insert into fieldLessThan5Chars(yourZipCode) values('10');
Query OK, 1 row affected (0.17 sec)
mysql> insert into fieldLessThan5Chars(yourZipCode) values('0');
Query OK, 1 row affected (0.15 sec)
mysql> insert into fieldLessThan5Chars(yourZipCode) values('90209');
Query OK, 1 row affected (0.11 sec)
mysql> insert into fieldLessThan5Chars(yourZipCode) values('33124');
Query OK, 1 row affected (0.20 sec)
使用 select 语句显示表中的所有记录。查询如下 −
mysql> select *from fieldLessThan5Chars;
以下是输出 −
+----+-------------+ | Id | yourZipCode | +----+-------------+ | 1 | 35801 | | 2 | 3580 | | 3 | 90001 | | 4 | 100 | | 5 | 10 | | 6 | 0 | | 7 | 90209 | | 8 | 33124 | +----+-------------+ 8 rows in set (0.00 sec)
示例
以下查询用于获取字段值少于 5 个字符的所有行 −
mysql> select *from fieldLessThan5Chars where length(yourZipCode) < 5;
输出
+----+-------------+ | Id | yourZipCode | +----+-------------+ | 2 | 3580 | | 4 | 100 | | 5 | 10 | | 6 | 0 | +----+-------------+ 4 rows in set (0.00 sec)
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有用资源
mysql 参考教程 - 该教程包含有关 mysql 的更多信息:https://www.cainiaomax.com/mysql/
