使用CAST（）和MAX（）/ MIN（）

Question

我有一些街道號存儲爲VARCHAR，但我想在可能的情況下將它們排序爲INT。該語法被接受，但產生的α-排序集合像最大= 53，最小= 1203

SELECT `StreetName`, 
CAST(MIN(`StreetNumber`) AS UNSIGNED) as min, 
CAST(MAX(`StreetNumber`) AS UNSIGNED) as max 
FROM `tblAddToLotBridge` 
WHERE `LotNumber` = '$item_lotnum' 
AND `Primary_Secondary` = 0 
GROUP BY `StreetName` 
ORDER BY `StreetName` 

我試圖嵌套CAST()的MIN()/MAX()內，但該語法得到拒絕。

什麼是正確的DWIM的sytax？

Answer 1

這是你試過的嗎？

SELECT `StreetName`, 
MIN(CAST(`StreetNumber` AS UNSIGNED)) as min, 
MAX(CAST(`StreetNumber` AS UNSIGNED)) as max 
FROM `tblAddToLotBridge` 
WHERE `LotNumber` = '$item_lotnum' 
AND `Primary_Secondary` = 0 
GROUP BY `StreetName` 
ORDER BY `StreetName`