使用调用另一个 CTE 的 CTE - 附近的语法不正确；

Question

我正在尝试创建一个调用另一个 CTE 的 CTE，如下所示。但我得到这个错误：

消息 102，级别 15，状态 1，第 54 行 ';' 附近的语法不正确。

我真的看不出问题出在哪里。我检查了一堆与我类似的其他问题并尝试了这些问题的解决方案，但由于某种原因它不起作用。

With SEASONALITY_AVG_REVENUE
(
    YearKey
    ,Aggregation_Key
    ,Yearly_Avg_Revenue
)   
as
(
    SELECT
        ts.YearKey,
        agg.Aggregation_Key,
        Yearly_Avg_Revenue = AVG(agg.Revenue)

    FROM 
        seasonality_custom.TIME_SERIES_INDEX ts
        INNER JOIN seasonality_custom.SEASONALITY_AGG_TIME_SERIES agg
        ON ts.TIME_SERIES_INDEX = agg.TIME_SERIES_INDEX
    GROUP BY
        ts.YearKey,
        agg.Aggregation_Key  
)
, SEASONALITY_ALL_RECS
(
    YearKey
    ,Aggregation_Key
    ,Revenue
    ,Yearly_Avg_Revenue
)   
as
(
    SELECT
        ts.YearKey,
        agg.Aggregation_Key,
        agg.Revenue,
        Yearly_Avg_Revenue = savg.Yearly_Avg_Revenue
    FROM 
        seasonality_custom.TIME_SERIES_INDEX ts
        INNER JOIN seasonality_custom.SEASONALITY_AGG_TIME_SERIES agg
        ON ts.TIME_SERIES_INDEX = agg.TIME_SERIES_INDEX
        INNER JOIN SEASONALITY_AVG_REVENUE savg
        ON ts.YearKey = savg.YearKey and agg.Aggregation_Key = savg.Aggregation_Key
);

Answer 1

您不能拥有with 语句，除非您在其后跟一些其他语句，通常是select，但在许多数据库中update 和delete 也是如此。

您的语句有多个 CTE，但它没有主要查询部分。错误在分号上，因为这会终止查询。

Answer 2

你真的需要一个 CTE

; With SEASONALITY_AVG_REVENUE(YearKey, Aggregation_Key, Yearly_Avg_Revenue)   
AS
 (
SELECT  ts.YearKey,
        agg.Aggregation_Key,
        Yearly_Avg_Revenue = AVG(agg.Revenue)

FROM seasonality_custom.TIME_SERIES_INDEX ts INNER JOIN 
seasonality_custom.SEASONALITY_AGG_TIME_SERIES agg
ON ts.TIME_SERIES_INDEX = agg.TIME_SERIES_INDEX
GROUP BY ts.YearKey, agg.Aggregation_Key  
  )

SELECT ts.YearKey,
        agg.Aggregation_Key,
        agg.Revenue,
        Yearly_Avg_Revenue = savg.Yearly_Avg_Revenue
FROM seasonality_custom.TIME_SERIES_INDEX ts
INNER JOIN  seasonality_custom.SEASONALITY_AGG_TIME_SERIES agg
ON ts.TIME_SERIES_INDEX = agg.TIME_SERIES_INDEX
INNER JOIN SEASONALITY_AVG_REVENUE savg
ON ts.YearKey = savg.YearKey and  agg.Aggregation_Key = savg.Aggregation_Key

或者

正如 Gordon 提到的，CTE 后面需要跟一个 SELECT、UPDATE、DELETE 语句。

使用您当前的查询，您只需在第二个 CTE 的末尾进行选择，它也会返回相同的结果，但这将是一个不必要的步骤。像这样的..

;WITH CTE1 (Col1, Col2)
AS 
  (
    -- Some code here
  ),
CTE2
AS 
  (
     -- Some code here
  )
SELECT * FROM CTE2