Teradata SQL：如何使用 SUM 函数根据情况 A 或 B 将总和分为 2 组？

Question

SELECT
    Account,
    CASE WHEN Type = 1 THEN SUM(Amount) END AS Type1_tot,
    CASE WHEN Type = 2 THEN SUM(Amount) END AS Type2_tot
FROM Table

Error - Selected non-aggregate values must be part of the associated group.

请在下面查找 table 数据和预期结果：

Answer 1

使用条件聚合，而不是对 CASE 表达式求和：

SELECT
    Account,
    SUM(CASE WHEN Type = 1 THEN Amount ELSE 0 END) AS Type1_tot,
    SUM(CASE WHEN Type = 2 THEN Amount ELSE 0 END) AS Type2_tot
FROM yourTable
GROUP BY
    Account

Teradata SQL：如何使用 SUM 函数根据情况 A 或 B 将总和分为 2 组？

Teradata SQL: How to use SUM function to Sum total into 2 groups depending on whether case A or B?

sum

case

aggregate-functions

teradata