Har bir toifaga umumiy daromadni qaytaradigan so'rov yozish kerak: |prod_cat |total_amt | |Kategoriya 1|80 | |Kategoriya 2|84 | |Kategoriya 3|270 | Obunachilar uchun turli vaqtlarda kelgan yozuvlar bo'lgan jadval mavjud. Yozuvni yuklash sanasi raw_dt maydonida belgilangan: select * from abnt |id |msisdn |tarif_plan_id|account_id|raw_dt | |1 |[phone]|4375 |4979 |[phone]| |1 |[phone]|5842 |4979 |[phone]| |2 |[phone]|5842 |589783|[phone]| |2 |[phone]|4563 |5326 |[phone]| |2 |[phone]|4563 |0832 |[phone]| |3 |[phone]|4563 |0832 |[phone]| |3 |[phone]|5495 |7485 |[phone]| |3 |[phone]|4563 |0832 |[phone]| |3 |[phone]|4563 |0832 |[phone]| Yuklangan yozuvni ikkinchi marta qaytaradigan so'rov yozish kerak: |id |msisdn |tarif_plan_id|account_id|raw_dt | |1 |[phone]|5842 |4979 |[phone]| |2 |[phone]|4563 |0832 |[phone]| |3 |[phone]|4563 |0832 |[phone]| Obunachilar uchun o'zgarishlar tarixiga ega jadval mavjud. Har bir yozuv obunachining valid_from_dt dan valid_to_dt gacha amal qiladi. Agar yozuv yopilsa, keyingi yozuv shu sanadan boshlanadi. Har bir obunachi uchun faqat bitta faol yozuv bo'lishi kerak [valid_from_dt, valid_to_dt] oralig'ida. select * from abnt |id |valid_from_dt|valid_to_dt|msisdn |tarif_plan_id|account_id| |1 |[phone] |[phone] |[phone]|4375 |4979 | |2 |[phone] |[phone] |[phone]|5842 |589783| |2 |[phone] |[phone] |[phone]|4563 |5326 | |3 |[phone] |[phone] |[phone]|4563 |0832 | Ushbu so'rov noto'g'ri yopilish sanasi bo'lgan yozuvlarni qaytarishi kerak: |id |valid_from_dt|valid_to_dt|msisdn |tarif_plan_id|account_id| |2 |[phone] |[phone] |[phone]|5842 |4979 | |2 |[phone] |[phone] |[phone]|4563 |5326 | ranked as ( select msisdn, tarif_plan_id, account_id, raw_dt, row_number() over (partition by id order by raw_dt desc) as rn ) select id, msisdn, tarif_plan_id, account_id, raw_dt from ranked where rn = 2 order by id