{ @Autowired private UserMapper userMapper; public List<User> getDistinctUsersByNameGroupBy() { LambdaQueryWrapper<User> queryWrapper = new LambdaQueryWrapper<>(); queryWrapper.select(User::getName) .groupBy(User::getName) .having("count(*) > 1"); return userMapper....
在设置完查询条件后,调用 MyBatis-Plus 提供的统计方法进行操作。常用的统计方法包括 count、countDistinct 等。下面是一些示例代码: // 统计满足条件的记录数intcount=mapper.selectCount(queryWrapper);// 统计满足条件的不重复记录数intdistinctCount=mapper.selectCount(queryWrapper.setDistinct(true)); 1. 2. 3....
AS country, COUNT() AS high_scores, COUNT() AS low_scores -- New column /* 我感觉这里有点问题, 根据之后的 JION 的情况 这里应该是 COUNT(【DISTINCT】 /) 才对? */ FROM country AS c INNER JOIN s1 ON = s1.country_id INNER JOIN s2 -- New join ON = s2.country_id GROUP BY countr...
生成的SQL: SELECT DISTINCT `day`,month FROM detail WHERE user_id = ? AND month = ? 例子2 List<Detail> list = list(newQueryWrapper<Detail>().select("sum(skipping_duration) totalDuration","count(1) totalTimes") .lambda().eq(Detail::getUserId, userId)); ——— 版权声明:本文为CSDN博...
public IPage<Ds> selectDistinctDsByPage(DsQueryForm queryForm) { Integer currentPage = queryForm.getCurrentPage(); Integer pageSize = queryForm.getPageSize(); Page<Ds> page = new Page<>(currentPage, pageSize); LambdaQueryWrapper<Ds> lqw = new LambdaQueryWrapper<>(); ...
StringUtil.isEmpty(dsCode)) { lqw.likeRight(Ds::getDsCode, SqlUtil.escapeLike(dsCode)); lqw.groupBy(Ds::getDsCode).having("count (0) >1"); } else if (!StringUtil.isEmpty(dsSourceName)) { lqw.like(Ds::getDsSourceName, SqlUtil.escapeLike(dsSourceName)); lqw.groupBy(Ds::getDs...
public IPage<Ds> selectDistinctDsByPage(DsQueryForm queryForm) { Integer currentPage = queryForm.getCurrentPage(); Integer pageSize = queryForm.getPageSize(); Page<Ds> page = new Page<>(currentPage, pageSize); LambdaQueryWrapper<Ds> lqw = new LambdaQueryWrapper<>(); ...
void testCountDistinctUseLambda() { LambdaQueryWrapper<CommonData> lambdaQueryWrapper = new QueryWrapper<CommonData>().select("distinct test_int, test_str").lambda(); int count = commonDataMapper.selectCount(lambdaQueryWrapper); Assertions.assertEquals(1, count); } 代码示例来源:origin: baomidou/my...
mybatisplus lambdaquerywrapper.select怎么去重呀万码学堂可能是中国最靠谱的IT培训机构。我们希望能通过...
public IPage<Ds> selectDistinctDsByPage(DsQueryForm queryForm) { Integer currentPage = queryForm.getCurrentPage(); Integer pageSize = queryForm.getPageSize(); Page<Ds> page = new Page<>(currentPage, pageSize); LambdaQueryWrapper<Ds> lqw = new LambdaQueryWrapper<>(); ...