ดึงแถวที่ความยาวฟิลด์น้อยกว่า 5 ตัวอักษรใน MySQL

ใช้ฟังก์ชัน LENGTH() ไวยากรณ์:

SELECT * FROM yourTableName WHERE LENGTH(yourColumnName) < 5;

มาสร้างตาราง:

mysql> create table fieldLessThan5Chars ( Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, yourZipCode varchar(10) ); Query OK, 0 rows affected (0.52 sec)

แทรกข้อมูล:

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)

แสดงข้อมูล:

mysql> select * from fieldLessThan5Chars;

ผลลัพธ์:

+----+-------------+ | 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)

ตัวอย่าง

คำสั่งดึงแถวที่ความยาวน้อยกว่า 5:

mysql> select * from fieldLessThan5Chars where length(yourZipCode) < 5;

ผลลัพธ์

+----+-------------+ | Id | yourZipCode | +----+-------------+ | 2 | 3580 | | 4 | 100 | | 5 | 10 | | 6 | 0 | +----+-------------+ 4 rows in set (0.00 sec)