SQL去除重复列数据为 A B CSH12 AAA 2012-12-21SH12 AAA 2012-12-22SH13 BBB 2012-12-22查询结果为 A B CSH12 AAA 2012-12-22SH13 BBB 2012-12-22求大神帮主主要是为了去除A 列的重复值[解决办法]
