来自你的消息:

select
class_code,
avg(class_index),

extract ( 
    YEAR 
from 
    releasedate 
) , 
extract ( 
    quarter 
from 
    releasedate 
) 

from

liny_price_index_class_month 

where LENGTH(class_code)<10

group by

extract ( 
    YEAR 
from 
    releasedate 
) , 
extract ( 
    quarter 
from 
    releasedate 
),class_code    计算环比值 按照    extract ( 
    YEAR 
from 
    releasedate 
) , 
extract ( 
    quarter 
from 
    releasedate 
),class_code  作为季度比较

来自ChatAI的消息:

很好,这是一条SQL查询命令,用于从数据库中按季度获取价格指数数据并计算环比值。这条查询命令会选择出长度小于10的class_code,并按年份、季度和class_code分组,然后计算每个分组中的平均class_index值。最后,使用extract函数从releasedate列中提取年份和季度信息,并将它们与class_code一起作为分组的条件,并计算环比值。

需要注意的是,在这个查询命令中,环比值是在每个分组内计算的,并不是对整个结果集进行计算。如果你需要对整个结果集进行环比计算,那么需要对每一个分组的结果再进行一次计算。

来自你的消息:

你写一个怎么处理的sql

来自ChatAI的消息:

好的,以下是一个处理该查询命令的SQL代码:

WITH t1 AS (
  SELECT class_code,
         AVG(class_index) AS avg_class_index,
         EXTRACT(YEAR FROM releasedate) AS year,
         EXTRACT(QUARTER FROM releasedate) AS quarter
  FROM liny_price_index_class_month
  WHERE LENGTH(class_code)<10
  GROUP BY year, quarter, class_code
), t2 AS (
  SELECT class_code,
         avg_class_index,
         year,
         quarter,
         LAG(avg_class_index) OVER (
           PARTITION BY class_code
           ORDER BY year, quarter
         ) AS prev_avg_class_index
  FROM t1
)
SELECT class_code,
       year,
       quarter,
       avg_class_index,
       prev_avg_class_index,
       (avg_class_index - prev_avg_class_index) / prev_avg_class_index AS qoq_growth
FROM t2
ORDER BY class_code, year, quarter;

这个查询将首先创建一个名为t1的临时表,该表包含聚合后的平均class_index值、年份、季度和class_code信息。随后,它还将创建另一个名为t2的临时表,该表是在t1基础上加上了一个prev_avg_class_index字段,该字段对应于class_code相同的前一个季度的平均class_index值。

最后,查询将从t2中选择出class_code、year、quarter、avg_class_index、prev_avg_class_index和qoq_growth,其中qoq_growth字段表示季度环比增长率。

来自你的消息:

qoq_growth出现了0E-20这个问题怎么解决

来自ChatAI的消息:

这个问题出现的原因是在进行除法运算时,被除数和除数的数据类型都是浮点数,但是当两个浮点数相差非常微小时,计算结果可能出现精度误差,结果显示成科学计数法的形式,而0E-20就是科学计数法的一种表示方式,表示数字0乘以$10^{-20}$。

为了解决这个问题,可以在计算季度环比增长率(qoq_growth)时,对分母(prev_avg_class_index)进行判断,如果分母的值非常接近0,则将季度环比增长率的值设为0。以下是修改后的代码:

SELECT class_code,
       year,
       quarter,
       avg_class_index,
       prev_avg_class_index,
       CASE 
          WHEN ABS(prev_avg_class_index) < 0.000001 THEN 0
          ELSE (avg_class_index - prev_avg_class_index) / prev_avg_class_index
       END AS qoq_growth
FROM t2
ORDER BY class_code, year, quarter;

在这个修改后的代码中,使用abs()函数判断prev_avg_class_index的绝对值是否小于或等于0.000001,如果是,则将qoq_growth的值设为0,否则根据公式计算季度环比增长率的值。

来自你的消息:

还有这个问题 能否把avg_class_index 和prev_avg_class_index保留两位小数 然后进行计算

来自ChatAI的消息:

可以的,可以在代码中使用ROUND函数将平均值和前一个季度平均值保留两位小数,然后再计算季度环比增长率。

以下是修改后的代码:

WITH t1 AS (
  SELECT class_code,
         ROUND(AVG(class_index), 2) AS avg_class_index,
         EXTRACT(YEAR FROM releasedate) AS year,
         EXTRACT(QUARTER FROM releasedate) AS quarter
  FROM liny_price_index_class_month
  WHERE LENGTH(class_code)<10
  GROUP BY year, quarter, class_code
), t2 AS (
  SELECT class_code,
         avg_class_index,
         year,
         quarter,
         LAG(avg_class_index) OVER (
           PARTITION BY class_code
           ORDER BY year, quarter
         ) AS prev_avg_class_index
  FROM t1
)
SELECT class_code,
       year,
       quarter,
       avg_class_index,
       prev_avg_class_index,
       CASE 
          WHEN ABS(prev_avg_class_index) < 0.000001 THEN 0
          ELSE ROUND((avg_class_index - prev_avg_class_index) / prev_avg_class_index, 4)
       END AS qoq_growth
FROM t2
ORDER BY class_code, year, quarter;

在这个修改后的代码中,使用ROUND()函数将avg_class_index和prev_avg_class_index的值保留两位小数,然后在计算季度环比增长率的时候,使用ROUND() 函数将结果保留四位小数,以便更好地表示增长率。

来自你的消息:

qoq_growth 也要保留两位小数

来自ChatAI的消息:

好的,以下是修改后的代码,将qoq_growth也保留两位小数:

WITH t1 AS (
  SELECT class_code,
         ROUND(AVG(class_index), 2) AS avg_class_index,
         EXTRACT(YEAR FROM releasedate) AS year,
         EXTRACT(QUARTER FROM releasedate) AS quarter
  FROM liny_price_index_class_month
  WHERE LENGTH(class_code)<10
  GROUP BY year, quarter, class_code
), t2 AS (
  SELECT class_code,
         avg_class_index,
         year,
         quarter,
         LAG(avg_class_index) OVER (
           PARTITION BY class_code
           ORDER BY year, quarter
         ) AS prev_avg_class_index
  FROM t1
)
SELECT class_code,
       year,
       quarter,
       avg_class_index,
       prev_avg_class_index,
       ROUND(CASE 
          WHEN ABS(prev_avg_class_index) < 0.000001 THEN 0
          ELSE (avg_class_index - prev_avg_class_index) / prev_avg_class_index
       END, 2) AS qoq_growth
FROM t2
ORDER BY class_code, year, quarter;

在这个修改后的代码中,在计算季度环比增长率(qoq_growth)的时候,使用ROUND() 函数将结果保留两位小数。

来自你的消息:

ELSE (avg_class_index - prev_avg_class_index) / prev_avg_class_index 我建议乘以100 作为比例

来自ChatAI的消息:

好的,如果需要将季度环比增长率表示为百分比,可以在计算季度环比增长率时,将结果乘以100,表示为百分比形式。

以下是修改后的代码:

WITH t1 AS (
  SELECT class_code,
         ROUND(AVG(class_index), 2) AS avg_class_index,
         EXTRACT(YEAR FROM releasedate) AS year,
         EXTRACT(QUARTER FROM releasedate) AS quarter
  FROM liny_price_index_class_month
  WHERE LENGTH(class_code)<10
  GROUP BY year, quarter, class_code
), t2 AS (
  SELECT class_code,
         avg_class_index,
         year,
         quarter,
         LAG(avg_class_index) OVER (
           PARTITION BY class_code
           ORDER BY year, quarter
         ) AS prev_avg_class_index
  FROM t1
)
SELECT class_code,
       year,
       quarter,
       avg_class_index,
       prev_avg_class_index,
       CASE 
          WHEN ABS(prev_avg_class_index) < 0.000001 THEN 0
          ELSE ROUND((avg_class_index - prev_avg_class_index) / prev_avg_class_index * 100, 2)
       END AS qoq_growth_percent
FROM t2
ORDER BY class_code, year, quarter;

在这个修改后的代码中,在计算季度环比增长率(qoq_growth)的时候,将结果乘以100来表示为百分比形式,并使用ROUND() 函数将结果保留两位小数。同时,修改为了qoq_growth_percent,以便更清晰地表示百分比形式。

来自你的消息:

这个sql 可以返回到mybatis结果中么 请写一下。然后用List<实体>的形式接受

来自ChatAI的消息:

可以的。你可以使用Java中的JDBC来执行这个SQL语句,然后通过ResultSet获取查询结果,并将结果转化为实体列表。具体步骤如下:

1.定义实体类,包含查询结果的所有字段。假设实体类的名称为Result,包含以下字段:

private String classCode;
private int year;
private int quarter;
private double avgClassIndex;
private double prevAvgClassIndex;
private double qoqGrowthPercent;

2.使用JDBC执行SQL语句。假设你已经建立了数据库连接,并通过该连接创建了一个statement对象,可以使用如下的代码执行SQL语句,将查询结果保存到ResultSet对象中:

String sql = "WITH t1 AS (...)";
ResultSet rs = statement.executeQuery(sql);

3.将ResultSet对象中的每一行数据转化成Result实体,并将所有Result实体添加到List中:

List<Result> resultList = new ArrayList<>();

while(rs.next()) {
  Result result = new Result();
  result.classCode = rs.getString("class_code");
  result.year = rs.getInt("year");
  result.quarter = rs.getInt("quarter");
  result.avgClassIndex = rs.getDouble("avg_class_index");
  result.prevAvgClassIndex = rs.getDouble("prev_avg_class_index");
  result.qoqGrowthPercent = rs.getDouble("qoq_growth_percent");
  resultList.add(result);
}

4.最终得到一个包含了所有Result实体的List对象resultList,可以将其返回给MyBatis框架,然后进行业务处理。

注意:代码中的Result实体类字段使用了默认的访问修饰符,因此需要在同一个包中才能访问到。如果实体类定义在不同的包中,请使用public修饰符修饰实体类的所有字段。

来自你的消息:

对的,mybatis中xml直接写就可以是吧

来自ChatAI的消息:

是的,你可以把这个SQL语句用MyBatis的XML配置文件写出来,然后通过MyBatis的Mapper接口调用来执行这个SQL语句,并返回Result实体的List列表。具体步骤如下:

1.定义查询结果对应的实体类Result,与之前的步骤相同。

2.创建一个ResultMapper.xml文件,使用select标签定义SQL语句和返回的结果集,其中使用resultType属性指定返回结果的实体类为Result,并使用column属性指定查询结果中每一列的名称。例如:

<select id="getResults" resultMap="resultMap">
  WITH t1 AS (
    SELECT class_code,
           ROUND(AVG(class_index), 2) AS avg_class_index,
           EXTRACT(YEAR FROM releasedate) AS year,
           EXTRACT(QUARTER FROM releasedate) AS quarter
    FROM liny_price_index_class_month
    WHERE LENGTH(class_code)<10
    GROUP BY year, quarter, class_code
  ), t2 AS (
    SELECT class_code,
           avg_class_index,
           year,
           quarter,
           LAG(avg_class_index) OVER (
             PARTITION BY class_code
             ORDER BY year, quarter
           ) AS prev_avg_class_index
    FROM t1
  )
  SELECT class_code,
         year,
         quarter,
         avg_class_index,
         prev_avg_class_index,
         CASE 
            WHEN ABS(prev_avg_class_index) < 0.000001 THEN 0
            ELSE ROUND((avg_class_index - prev_avg_class_index) / prev_avg_class_index * 100, 2)
         END AS qoq_growth_percent
  FROM t2
  ORDER BY class_code, year, quarter;
</select>

<resultMap type="Result" id="resultMap">
  <result column="class_code" property="classCode" />
  <result column="year" property="year" />
  <result column="quarter" property="quarter" />
  <result column="avg_class_index" property="avgClassIndex" />
  <result column="prev_avg_class_index" property="prevAvgClassIndex" />
  <result column="qoq_growth_percent" property="qoqGrowthPercent" />
</resultMap>

3.在MyBatis的Mapper接口中定义调用上述SQL语句的方法,并使用@Select注解指定ResultMapper.xml文件中的select标签对应的查询语句。例如:

public interface ResultMapper {
  @Select("select * from getResults")
  List<Result> getResults();
}

4.最后,在Java代码中使用MyBatis的SqlSession对象调用上述Mapper接口中的方法,并获取返回值。例如:

SqlSession sqlSession = sqlSessionFactory.openSession();
ResultMapper resultMapper = sqlSession.getMapper(ResultMapper.class);
List<Result> resultList = resultMapper.getResults();

这样就可以通过MyBatis的Mapper接口调用上述查询,并返回Result实体的List对象了。

来自你的消息:

循环这个List并且把当前期的值,上一期的值,以及上一年中的季度相同的值获取出来。

来自ChatAI的消息:

好的,你可以使用Java的for循环来遍历List,并使用if条件语句筛选出符合条件的数据。以下是具体的代码实现:

List<Result> resultList = resultMapper.getResults();
for (int i = 1; i < resultList.size(); i++) {
  Result currentResult = resultList.get(i); // 当前期
  Result previousResult = resultList.get(i - 1); // 上一期
  int currentYear = currentResult.getYear(); // 当前期所在的年份
  int previousYear = previousResult.getYear(); // 上一期所在的年份
  int currentQuarter = currentResult.getQuarter(); // 当前期所在的季度
  int previousQuarter = previousResult.getQuarter(); // 上一期所在的季度
  String classCode = currentResult.getClassCode(); // 商品代码
  
  // 获取上一年同期的数据
  for (int j = i - 1; j >= 0; j--) {
    Result tempResult = resultList.get(j);
    if (tempResult.getYear() == previousYear && tempResult.getQuarter() == previousQuarter && tempResult.getClassCode().equals(classCode)) {
      previousYearSameQuarterResult = tempResult;
      break;
    }
  }
  
  // 对当前期和上一期进行处理
  // ...
}

在以上代码中,我们使用for循环遍历List中的每一个元素,并使用get方法获取该元素中各个字段的值。接着,我们判断当前结果和上一结果所在的年份和季度是否相同,如果相同,则将符合要求的元素存入对应的变量中,以便后续的处理。

在实际业务中,对当前期和上一期的处理方式可能各不相同,这里暂时无法提供具体的代码。你可以根据实际需求对其进行修改。

来自你的消息:

那个SQL只获取指定的两期数据怎么处理呢,比如获取2023年的二季度和一季度或者2023年的一季度和2022年的四季度。这两个条件要灵活的接收

来自ChatAI的消息:

如果要从SQL语句中获取指定的两期数据,则可以将查询条件添加到WHERE子句中,例如:

SELECT class_code,
       year,
       quarter,
       avg_class_index,
       prev_avg_class_index,
       CASE 
          WHEN ABS(prev_avg_class_index) < 0.000001 THEN 0
          ELSE ROUND((avg_class_index - prev_avg_class_index) / prev_avg_class_index * 100, 2)
       END AS qoq_growth_percent
FROM (
  SELECT class_code,
         ROUND(AVG(class_index), 2) AS avg_class_index,
         EXTRACT(YEAR FROM releasedate) AS year,
         EXTRACT(QUARTER FROM releasedate) AS quarter,
         LAG(ROUND(AVG(class_index), 2)) OVER (
           PARTITION BY class_code
           ORDER BY year, quarter
         ) AS prev_avg_class_index
  FROM liny_price_index_class_month
  WHERE LENGTH(class_code) < 10
    AND (
      (year = #{year1} AND quarter = #{quarter1}) OR
      (year = #{year2} AND quarter = #{quarter2})
    )
  GROUP BY year, quarter, class_code
) t
ORDER BY class_code, year, quarter;

在以上SQL语句中,我们使用了WHERE子句来筛选出符合条件的数据,其中year1、quarter1、year2和quarter2表示指定的两期数据的年份和季度。在WHERE子句中,我们使用了OR逻辑运算符来判断一个查询结果的年份和季度是否等于指定的两期。注意,这里使用了MyBatis中的#{}语法,需要在MyBatis的Mapper接口中定义这些参数。

在Java代码中,我们可以将参数year1、quarter1、year2和quarter2作为参数传递给Mapper接口中的方法,如下所示:

public interface ResultMapper {
  @Select("SELECT class_code, ... AND ((year = #{year1} AND quarter = #{quarter1}) OR (year = #{year2} AND quarter = #{quarter2})) ...")
  List<Result> getResults(@Param("year1") int year1, @Param("quarter1") int quarter1, @Param("year2") int year2, @Param("quarter2") int quarter2);
}

在Java代码中,我们将指定的年份和季度year1、quarter1、year2和quarter2作为参数传递给Mapper接口中的方法,使用@Param注解来为参数命名。然后,调用Mapper接口中的方法来获取查询结果的List对象,可以再按照前文的方式对其进行处理。

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