0
您好我有这个下表..如何使用字符串和int值
offer_number training_title
**************
ABC-1 SEMINAR
ABC-9 SEMINAR
ABC-10 SEMINAR
ABCD-9 TRAINING
EFGH-9 TESTING
EFGH-10 TESTING
Mysql的
SELECT *, MAX(offer_number) as offer_number_latest FROM (`training_program`) WHERE `training_title` LIKE '%SEMINAR%' GROUP BY `training_title` ORDER BY `offer_number` desc
我想制作ABC-10 但 我总是得到ABC-选择马克斯9而不是ABC-10。
示例2:
SELECT *, MAX(offer_number) as offer_number_latest FROM (`training_program`) WHERE `training_title` LIKE '%TESTING%' GROUP BY `training_title` ORDER BY `offer_number` desc
我需要的结果EFGH-10 但 我总是EFGH-9不是EFGH-10。
9> 1 - 你就必须有“ABC-09”进行比较,以工作的方式..相反,你可以“提取”从字符串的数量和使用 - 简单的应该是“REPLACE(offer_number ,'ABC-','')“只获取字符串的数字部分([或使用udf正则表达式?](http://stackoverflow.com/a/986870/1786423)),然后您可能必须CAST()表示数字(或加上+0使用自动转换) – jkavalik
是字符前缀总是每组相同? –
freddy?上面的任何输入? –