mysql - 将 CAST() 与 MAX()/MIN() 一起使用

Question

我有一些存储为 VARCHAR 的街道号码，但我想尽可能将它们排序为 INT。此语法被接受，但会生成 alpha 排序集，例如 max = 53、min = 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`

我尝试在 / 中嵌套CAST()，MIN()但MAX()该语法被拒绝了。

DWIM 的正确语法是什么？

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`