如何为 postgresql 中查询的前 n 行分配唯一标识符？

Question

在 postgres SQL 中，如何为查询的前 n 行分配唯一标识符 (rn?)，并为后续的 n 行分配唯一标识符？ objective 是按代码和唯一标识符分组，详情请参阅实际与预期屏幕截图。

实际查询

SELECT 
    *,
    SUM(eps_diluted) OVER (PARTITION BY ticker ORDER BY rn ASC ROWS BETWEEN CURRENT ROW AND 3 FOLLOWING) AS test_eps_diluted
FROM(
    SELECT 
        "PK",
        ticker,
        period_end_date,
        eps_diluted,
        ROW_NUMBER() OVER ( PARTITION BY ticker ORDER BY period_end_date DESC ) rn
    FROM "ANALYTICS"."vQUARTERLY_MASTER_MATERIALIZED" 
    --WHERE ticker = 'ACN' 
    ORDER BY ticker, period_end_date DESC
    ) q
ORDER BY ticker, period_end_date desc

Actual result

Expected result

Answer 1

我找到了一个使用模数的解决方法。该解决方案允许我对最近几个季度、随后的 4 个季度等求和 eps_diluted。有关详细信息，请参阅解决方案 屏幕截图。

SELECT 
    * 
FROM (
    SELECT 
        *,
        SUM(eps_diluted) OVER (PARTITION BY ticker ORDER BY rn ASC ROWS BETWEEN CURRENT ROW AND 3 FOLLOWING) AS sum_eps_diluted,
        1+ ((rn - 1) % 4) AS modulo
    FROM(
        SELECT 
            "PK",
            ticker,
            period_end_date,
            eps_diluted,
            ROW_NUMBER() OVER ( PARTITION BY ticker ORDER BY period_end_date DESC ROWS BETWEEN CURRENT ROW AND 3 FOLLOWING) rn
        FROM "ANALYTICS"."vQUARTERLY_MASTER_MATERIALIZED" 
        ORDER BY ticker, period_end_date DESC
        ) t1
    --WHERE 1+ ((rn - 1) % 4) = 1
    ORDER BY ticker, period_end_date desc ) t2
WHERE modulo = 1

Solution

如何为 postgresql 中查询的前 n 行分配唯一标识符？

How to assign a unique identifier to the first n rows of a query in postgresql?

postgresql

group-by

row-number