SELECT TOP (2)
       sender_id,
       COUNT(*) AS message_count
FROM   messages
WHERE  sent_date >= '2022-08-01'
  AND  sent_date <  '2022-09-01'
GROUP BY sender_id
ORDER BY COUNT(*) DESC, sender_id;

WITH monthly AS (
  SELECT sender_id, COUNT(*) AS message_count
  FROM   messages
  WHERE  sent_date >= '2022-08-01'
    AND  sent_date <  '2022-09-01'
  GROUP BY sender_id
),
ranked AS (
  SELECT sender_id, message_count,
         DENSE_RANK() OVER (ORDER BY message_count DESC) AS rnk
  FROM   monthly
)
SELECT sender_id, message_count
FROM   ranked
WHERE  rnk <= 2
ORDER BY message_count DESC, sender_id;

def query_user_data(user_id):
    query = f"SELECT id, name FROM users WHERE id = {user_id}"
    return pd.read_sql(query, "postgresql://localhost/mydb")

from unittest.mock import patch
import pandas as pd

@patch("pandas.read_sql")
def test_database_query_mocked(mock_read_sql):
    mock_read_sql.return_value = pd.DataFrame(
        {"id": [123], "name": ["Alice"]}
    )

    result = query_user_data(user_id=123)
    assert result["name"].iloc[0] == "Alice"

pip install chromadb
# или
npm install chromadb
chroma run --path ./chroma_db

import chromadb
client = chromadb.Client()
col = client.create_collection("docs")
col.add(documents=["Doc1","Doc2"], ids=["1","2"])
res = col.query(query_texts=["найди похожее"], n_results=1)