MYSQL：只提取最小字符長度的字

Question

如何從MYSQL提取最多50個字符的字符？

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

Answer 1

使用CHAR_LENGTH功能在WHERE約束嘗試：

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數。 LENGTH返回字節數。如果您的單詞可能包含多字節字符，則最好使用CHAR_LENGTH。

Answer 2

嘗試length（）函數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