例如表名为Course 需要查询出name重复的有那些??? 解答如下: 补充: 如:查询每个姓名出现大于2次,SQL如下 SELECT COUNT(NAME) as '出现次数', NAME FROM 表名GROUP BY NAME HAVING count(NAME) > 2 ORDER BY 出现次数 DESC
select B.enterprise_code, B.enterprise_name, sum(B.h0_overnum) AS over00, sum(B.h1_overnum) AS over01, sum(B.h2_overnum) AS over02, sum(B.h3_overnum) AS over03, sum(B.h4_overnum) AS over04, sum(B.h5_overnum) AS over05, sum(B.h6_overnum) AS over06, su
最近在搞一个电商系统中由于业务需求,需要在插入一条产品信息后返回产品Id,刚开始遇到一些坑,这里做下笔记,以防今后忘记. 类似下面这段代码一样获取插入后的主键 User user = new User(); user.setUserName("chenzhou"); user.setPassword("xxxx"); user.setComment("测试插入数据返回主键功能"); System.out.println("插入前主键为:
最近在搞一个电商系统中由于业务需求,需要在插入一条产品信息后返回产品Id,刚开始遇到一些坑,这里做下笔记,以防今后忘记. 类似下面这段代码一样获取插入后的主键 User user = new User(); user.setUserName("chenzhou"); user.setPassword("xxxx"); user.setComment("测试插入数据返回主键功能"); System.out.println("插入前主键为: