要將SQL字符串轉(zhuǎn)換為數(shù)字排序,可以使用CAST()函數(shù)將字符串轉(zhuǎn)換為數(shù)字,然后進(jìn)行排序。以下是一個(gè)示例:
假設(shè)有一個(gè)包含數(shù)字字符串的表t,如下所示:
+----+-------+
| id | value |
+----+-------+
| 1 | 10 |
| 2 | 5 |
| 3 | 20 |
| 4 | 15 |
+----+-------+
要按照數(shù)字值對(duì)value列進(jìn)行排序,可以使用以下SQL查詢(xún):
SELECT *
FROM t
ORDER BY CAST(value AS SIGNED);
執(zhí)行上述查詢(xún)后,結(jié)果將按照數(shù)字值排序:
+----+-------+
| id | value |
+----+-------+
| 2 | 5 |
| 1 | 10 |
| 4 | 15 |
| 3 | 20 |
+----+-------+