使用CAST（）和MAX（）/ MIN（）

Question

我有一些街道号存储为VARCHAR，但我想在可能的情况下将它们排序为INT。该语法被接受，但产生的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` 

我试图嵌套CAST()的MIN()/MAX()内，但该语法得到拒绝。

什么是正确的DWIM的sytax？

Answer 1

这是你试过的吗？

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`