AlgorithmicProblemMapper.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="com.kwan.springbootkwan.mapper.AlgorithmicProblemMapper">

    <select id="questionType" resultType="com.kwan.springbootkwan.entity.dto.AlgorithmicQuestionTypeDTO">
        SELECT DISTINCT question_type AS questionType, COUNT(*) AS typeSize
        FROM algorithmic_problem
        WHERE 1 = 1
          AND is_delete = 0
          AND question_type != 0
        GROUP BY question_type
        ORDER BY typeSize DESC
    </select>
</mapper>