sql server获取每个月新增多少数据没有的显示0
时间: 2024-02-23 16:01:54 浏览: 80
你可以尝试使用以下SQL语句来获取每个月新增数据的数量,并在没有数据的月份显示0:
```
WITH MonthlyData AS (
SELECT
YEAR(date_column) AS [Year],
MONTH(date_column) AS [Month],
COUNT(*) AS [NewData]
FROM your_table
GROUP BY YEAR(date_column), MONTH(date_column)
)
SELECT
[Year],
[Month],
COALESCE([NewData], 0) AS [NewData]
FROM (
SELECT
[Year],
[Month]
FROM (
SELECT DISTINCT
YEAR(date_column) AS [Year],
MONTH(date_column) AS [Month]
FROM your_table
) AS AllMonths
) AS AllMonths
LEFT JOIN MonthlyData
ON AllMonths.[Year] = MonthlyData.[Year] AND AllMonths.[Month] = MonthlyData.[Month]
ORDER BY [Year], [Month]
```
这个SQL语句首先创建了一个名为`MonthlyData`的公共表表达式(Common Table Expression,CTE),用于计算每个月新增数据的数量。然后,它创建了另一个名为`AllMonths`的子查询,用于获取所有可能的年份和月份组合。最后,它将`AllMonths`与`MonthlyData`进行左连接,以确保对于每个月份都有一个行来显示。`COALESCE`函数用于将NULL值替换为0。
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