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Q&A for those interested in the geology, meteorology, oceanography, and environmental sciences

SELECT 
    u.Id AS UserID,
    CONVERT(DATE, u.CreationDate) AS UserCreationDate,
    MIN(CONVERT(DATE, p.CreationDate)) AS JanuaryFirstPostDate,
    MAX(CONVERT(DATE, p.CreationDate)) AS JanuaryLastPostDate,
    COUNT(*) AS JanuaryPostCount
FROM 
    Users u
JOIN 
    Posts p ON u.Id = p.OwnerUserId
WHERE 
    CONVERT(DATE, u.CreationDate) = '2021-12-23'
    AND p.CreationDate BETWEEN '2022-01-01' AND '2022-01-31'
GROUP BY 
    u.Id, CONVERT(DATE, u.CreationDate)
ORDER BY 
    JanuaryPostCount DESC;
    
SELECT 
    u.Id AS UserID,
    CAST(u.CreationDate AS DATE) AS UserCreationDate,
    MIN(CAST(p.CreationDate AS DATE)) AS JanuaryFirstPostDate,
    MAX(CAST(p.CreationDate AS DATE)) AS JanuaryLastPostDate,
    COUNT(*) AS JanuaryPostCount
FROM 
    Users u
JOIN 
    Posts p ON u.Id = p.OwnerUserId
WHERE 
    CAST(u.CreationDate AS DATE) = '2021-12-23'
    AND p.CreationDate BETWEEN '2022-01-01' AND '2022-01-31'
GROUP BY 
    u.Id, CAST(u.CreationDate AS DATE)
ORDER BY 
    JanuaryPostCount DESC;

fork query

edited dec 12

created dec 12 anonymous