Oracle sql hoặc pl / sql:Tính toán dựa trên các giá trị hàng trước đó và trên cột ngày tháng

Từ Oracle 12c, bạn có thể làm điều đó bằng cách sử dụng MATCH_RECOGNIZE :

SELECT *
FROM   table_name
MATCH_RECOGNIZE(
  PARTITION BY stock
  ORDER     BY cdate
  MEASURES
    CLASSIFIER() AS pttrn
  ALL ROWS PER MATCH
  PATTERN (bullish|bearish|other)
  DEFINE
    bullish AS  PREV(open) > PREV(close)
            AND Close > Open
            AND Close > PREV(High)
            AND Open  < PREV(Low),
    bearish AS  Close < Open
            AND Close < PREV(Close)
            AND Open  < PREV(Close)
            AND PREV(Open) < PREV(Close)
            AND Close > PREV(Open)
            AND Open  < PREV(Close)
)

Mà, đối với dữ liệu mẫu:

CREATE TABLE table_name (Stock, Cdate, Open, High, Low, Close, Volume ) AS
SELECT 'XYZ', DATE '2021-01-01',  40.00,  40.50,  38.50,  38.80,  83057 FROM DUAL UNION ALL
SELECT 'XYZ', DATE '2021-01-02',  39.20,  39.20,  37.20,  37.80, 181814 FROM DUAL UNION ALL
SELECT 'XYZ', DATE '2021-01-03',  38.00,  38.50,  36.50,  37.00, 117378 FROM DUAL UNION ALL
SELECT 'XYZ', DATE '2021-01-04',  36.00,  36.10,  35.60,  35.70,  93737 FROM DUAL UNION ALL
SELECT 'XYZ', DATE '2021-01-05',  35.35,  36.80,  35.10,  36.60, 169106 FROM DUAL UNION ALL
SELECT 'XYZ', DATE '2021-01-06',  36.50,  38.50,  36.50,  38.00, 123179 FROM DUAL UNION ALL
SELECT 'XYZ', DATE '2021-01-07',  37.50,  39.50,  37.30,  39.40, 282986 FROM DUAL UNION ALL
SELECT 'XYZ', DATE '2021-01-08',  39.00,  40.50,  38.50,  40.00, 117437 FROM DUAL UNION ALL
SELECT 'DDD', DATE '2021-01-01', 135.35, 136.80, 135.10, 136.60,  16454 FROM DUAL UNION ALL
SELECT 'DDD', DATE '2021-01-02', 136.50, 138.50, 136.50, 138.00, 281461 FROM DUAL UNION ALL
SELECT 'DDD', DATE '2021-01-03', 137.50, 139.50, 137.30, 139.40,  77334 FROM DUAL UNION ALL
SELECT 'DDD', DATE '2021-01-04', 139.00, 140.50, 138.50, 140.00, 321684 FROM DUAL UNION ALL
SELECT 'DDD', DATE '2021-01-05', 139.70, 139.80, 139.30, 139.40, 873009 FROM DUAL UNION ALL
SELECT 'DDD', DATE '2021-01-06', 139.20, 139.20, 137.20, 137.80,  62522 FROM DUAL UNION ALL
SELECT 'DDD', DATE '2021-01-07', 138.00, 138.50, 136.50, 137.00, 114826 FROM DUAL UNION ALL
SELECT 'DDD', DATE '2021-01-08', 136.60, 136.80, 135.10, 135.35,  27317 FROM DUAL;

Kết quả đầu ra:

Bạn cũng có thể sử dụng LAG hàm phân tích (đã có trước Oracle 12):

SELECT t.*,
       CASE
       WHEN LAG(open) OVER (PARTITION BY stock ORDER BY cdate)
            > LAG(close) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Close > Open
       AND  Close > LAG(high) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Open  < LAG(low) OVER (PARTITION BY stock ORDER BY cdate)
       THEN 'BULLISH'
       WHEN Close < Open
       AND  Close < LAG(close) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Open  < LAG(close) OVER (PARTITION BY stock ORDER BY cdate)
       AND  LAG(open) OVER (PARTITION BY stock ORDER BY cdate)
            < LAG(close) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Close > LAG(open) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Open  < LAG(close) OVER (PARTITION BY stock ORDER BY cdate)
       THEN 'BEARISH'
       ELSE 'OTHER'
       END AS pttrn
FROM   table_name t

(Cho kết quả tương tự.)

db <> fiddle tại đây

Cập nhật:theo dõi LÊN VÀ XUỐNG:

Một lần nữa, đây là MATCH_RECOGNIZE dành cho:

SELECT *
FROM   table_name
MATCH_RECOGNIZE(
  PARTITION BY stock
  ORDER     BY cdate
  MEASURES
    CLASSIFIER() AS pttrn
  ALL ROWS PER MATCH
  PATTERN (^initial_value|bullish|bearish|up|down|other)
  DEFINE
    bullish AS  PREV(open) > PREV(close)
            AND Close > Open
            AND Close > PREV(High)
            AND Open  < PREV(Low),
    bearish AS  Close < Open
            AND Close < PREV(Close)
            AND Open  < PREV(Close)
            AND PREV(Open) < PREV(Close)
            AND Close > PREV(Open)
            AND Open  < PREV(Close),
    up      AS  close > PREV(close)
            AND open  > PREV(open),
    down    AS  close < PREV(close)
            AND open  < PREV(open)
)

Nhưng bạn có thể làm tương tự với LAG :

SELECT t.*,
       CASE
       WHEN ROW_NUMBER() OVER (PARTITION BY stock ORDER BY cdate) = 1
       THEN 'INITIAL_VALUE'
       WHEN LAG(open) OVER (PARTITION BY stock ORDER BY cdate)
            > LAG(close) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Close > Open
       AND  Close > LAG(high) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Open  < LAG(low) OVER (PARTITION BY stock ORDER BY cdate)
       THEN 'BULLISH'
       WHEN Close < Open
       AND  Close < LAG(close) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Open  < LAG(close) OVER (PARTITION BY stock ORDER BY cdate)
       AND  LAG(open) OVER (PARTITION BY stock ORDER BY cdate)
            < LAG(close) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Close > LAG(open) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Open  < LAG(close) OVER (PARTITION BY stock ORDER BY cdate)
       THEN 'BEARISH'
       WHEN Close > LAG(Close) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Open  > LAG(Open) OVER (PARTITION BY stock ORDER BY cdate)
       THEN 'UP'
       WHEN Close < LAG(Close) OVER (PARTITION BY stock ORDER BY cdate)
       AND  Open  < LAG(Open) OVER (PARTITION BY stock ORDER BY cdate)
       THEN 'DOWN'
       ELSE 'OTHER'
       END AS pttrn
FROM   table_name t

db <> fiddle tại đây