问: TSQL -在数据中添加缺失的年和月差距？

-- 获取最小年份和最大年份
SELECT MIN(YEAR(date_column)) AS min_year, MAX(YEAR(date_column)) AS max_year
FROM your_table;

-- 获取每个年份的最小月份和最大月份
SELECT YEAR(date_column) AS year, MIN(MONTH(date_column)) AS min_month, MAX(MONTH(date_column)) AS max_month
FROM your_table
GROUP BY YEAR(date_column);

-- 生成年份和月份序列表
DECLARE @start_year INT, @end_year INT;
SET @start_year = (SELECT MIN(YEAR(date_column)) FROM your_table);
SET @end_year = (SELECT MAX(YEAR(date_column)) FROM your_table);

DECLARE @date_table TABLE (year INT, month INT);

WHILE @start_year <= @end_year
BEGIN
    INSERT INTO @date_table (year, month)
    SELECT @start_year, 1 UNION ALL
    SELECT @start_year, 2 UNION ALL
    SELECT @start_year, 3 UNION ALL
    -- ...
    SELECT @start_year, 12;
    
    SET @start_year = @start_year + 1;
END

-- 连接原始数据表和年份月份序列表，并填充缺失的年和月差距
SELECT dt.year, dt.month, t.*
FROM @date_table dt
LEFT JOIN your_table t ON YEAR(t.date_column) = dt.year AND MONTH(t.date_column) = dt.month;