MySQL SELECT的字段小于和大于值

Question

我正在尝试使用phpMyAdmin或带有PDO的PHP对MySQL进行选择查询。

SELECT 'uid' FROM 'clusters' WHERE 'lat'<='47.21125' AND 'lat'>='39.21125' AND 'lng'<='32.90243' AND 'lng'>='22.90243'

然而，phpMyAdmin说：

#1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ''clusters' WHERE 'lat'<='47.21125' AND 'lat'>='39.21125' AND 'lng'<='32.90243' A' at line 1

它出了什么问题？

Answer 1

''在MySQL中创建一个字符串文字，因此您的查询是从文字“群集”中选择文字“uid”，这是无效的。使用背景（或没有）

SELECT Uid FROM clusters WHERE lat <= 47.21125 AND lat >= 39.21125
AND lng >= 22.90243