我的表的纬度和经度值存储为文本。对于lat和long值为:
的记录+------+-------------------+--------------------+
| Name | Lat | Long |
+------+-------------------+--------------------+
| ABC | 32.74943951828427 | -97.33141142455626 |
+------+-------------------+--------------------+
我的SQL查询就像:
SELECT * FROM Incident I WHERE
(I.Lat BETWEEN '32.740446302225' AND '32.758432734343')
AND
(I.Long BETWEEN '-97.342104340547' AND '-97.320718508566')
LIMIT 5
但这导致返回0行。 "ABC"
记录确实存在于表中,但我不知道它为什么不拉它。字符串不能作为浮点数进行比较吗?
答案 0 :(得分:4)
这是因为您将它们用作字符串。
BETWEEN
语法是 - > value BETWEEN small_val AND big_val
,但由于您将它们用作字符串,因此-97.34..
大于-97.32
,因此无效。
尝试:
(CAST(I.Lat as UNSIGNED) BETWEEN 32.740446302225 AND 32.758432734343)
AND
(CAST(I.Long as UNSIGNED) BETWEEN -97.342104340547 AND -97.320718508566)
在String类型列中存储数值是错误的!我强烈建议您将其更改为数字类型,因为它应该是。