MYSQL：只提取最小字符长度的字

Question

如何从MYSQL提取最多50个字符的字符？

$query = "SELECT * FROM example ORDER BY ID DESC LIMIT 200"; 

Answer 1

使用CHAR_LENGTH功能在WHERE约束尝试：

SELECT * FROM example WHERE CHAR_LENGTH(word) <= 50 ORDER BY ID DESC LIMIT 200 

CHAR_LENGTH返回字符串中的字符数。 LENGTH返回字节数。如果您的单词可能包含多字节字符，则最好使用CHAR_LENGTH。

Answer 2

尝试length（）函数http://dev.mysql.com/doc/refman/5.0/en/string-functions.html

Answer 3

SELECT * FROM example WHERE LENGTH(column) <= 50 ORDER BY ID DESC LIMIT 200