在MySQL中获取字段值小于5个字符的行?
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)
-> );
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');mysql> insert into fieldLessThan5Chars(yourZipCode) values('3580');
mysql> insert into fieldLessThan5Chars(yourZipCode) values('90001');
mysql> insert into fieldLessThan5Chars(yourZipCode) values('100');
mysql> insert into fieldLessThan5Chars(yourZipCode) values('10');
mysql> insert into fieldLessThan5Chars(yourZipCode) values('0');
mysql> insert into fieldLessThan5Chars(yourZipCode) values('90209');
mysql> insert into fieldLessThan5Chars(yourZipCode) values('33124');
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
这是查询以获取字段值小于5个字符的所有行-
mysql> select *from fieldLessThan5Chars where length(yourZipCode) < 5;
输出结果
+----+-------------+| Id | yourZipCode |
+----+-------------+
| 2 | 3580 |
| 4 | 100 |
| 5 | 10 |
| 6 | 0 |
+----+-------------+
4 rows in set (0.00 sec)
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