我有一个类似于以下的结果表：
我如何查询随着时间变化，最新价格和情感变化都在增加的股票行情。例如，您可以看到AMSC在latest_price和sentiment_change中都增加了。我正在使用postgresql，谢谢您的帮助
"created_at" "ticker" "title" "latest_price" "sentiment_change"
"2020-05-24 06:41:40.948862" "AMSC" "American Superconductor Corporation" "6.66" "5.56"
"2020-05-24 06:42:02.987018" "AMSC" "American Superconductor Corporation" "7.66" "6.56"
"2020-05-24 07:59:08.014871" "AMSC" "American Superconductor Corporation" "8.66" "7.27"
"2020-05-24 08:00:23.406509" "AMSC" "American Superconductor Corporation" "9.66" "8.27"
"2020-05-24 08:04:02.881144" "AMSC" "American Superconductor Corporation" "10.66" "9.27"
"2020-05-24 06:41:51.797114" "AUPH" "Aurinia Pharmaceuticals Inc." "16.24" "-0.37"
"2020-05-24 06:41:52.768141" "CGC" "Canopy Growth Corporation " "19.42" "-0.89"
"2020-05-24 06:42:06.947722" "COF" "Capital One Financial Corp." "60.21" "9.19"
"2020-05-24 07:58:49.696729" "CNC" "Centene Corp." "64.84" "0.0"
"2020-05-24 08:00:05.909404" "CNC" "Centene Corp." "64.84" "0.0"
我在这里为此创建了一个数据库提琴：https://www.db-fiddle.com/f/37qeZWoFpVLkJLqN16TirX/0
如果您的PostgreSQL版本支持LAG，则可以使用下面的查询开始。我已经完成了增加的部分，您可以完成减少的部分。
然后，您可以计算latest_price或sentiment_change相对于您拥有的观察次数的增加/减少的次数，如果超过某个阈值，则确定您的行动方针。
SELECT
created_at,
ticker,
latest_price,
sentiment_change,
LAG(latest_price,1) OVER (
PARTITION BY ticker
ORDER BY created_at) AS previous_price,
CASE WHEN latest_price >= LAG(latest_price, 1) OVER (
PARTITION BY ticker
ORDER BY created_at)
THEN 1 ELSE 0 END AS increased_price_flag,
LAG(sentiment_change,1) OVER (
PARTITION BY ticker
ORDER BY created_at) AS previous_sentiment_change,
CASE WHEN sentiment_change >= LAG(sentiment_change, 1) OVER (
PARTITION BY ticker
ORDER BY created_at)
THEN 1 ELSE 0 END AS increased_sentiment_change_flag
FROM results
ORDER BY ticker, created_at;
结果：
| created_at | ticker | latest_price | sentiment_change | previous_price | increased_price_flag | previous_sentiment_change | increased_sentiment_change_flag |
| ------------------------ | ------ | ------------ | ---------------- | -------------- | -------------------- | ------------------------- | ------------------------------- |
| 2020-05-24T06:41:40.948Z | AMSC | 6.66 | 5.56 | | 0 | | 0 |
| 2020-05-24T06:42:02.987Z | AMSC | 7.66 | 6.56 | 6.66 | 1 | 5.56 | 1 |
| 2020-05-24T07:59:08.014Z | AMSC | 8.66 | 7.27 | 7.66 | 1 | 6.56 | 1 |
| 2020-05-24T08:00:23.406Z | AMSC | 9.66 | 8.27 | 8.66 | 1 | 7.27 | 1 |
| 2020-05-24T08:04:02.881Z | AMSC | 10.66 | 9.27 | 9.66 | 1 | 8.27 | 1 |
| 2020-05-24T06:41:51.797Z | AUPH | 16.24 | -0.37 | | 0 | | 0 |
| 2020-05-24T06:41:52.768Z | CGC | 19.42 | -0.89 | | 0 | | 0 |
| 2020-05-24T07:58:49.696Z | CNC | 64.84 | 0.00 | | 0 | | 0 |
| 2020-05-24T08:00:05.909Z | CNC | 64.84 | 0.00 | 64.84 | 1 | 0.00 | 1 |
| 2020-05-24T06:42:06.947Z | COF | 60.21 | 9.19 | | 0 | | 0 |