[英]MS-ACCESS / SQL - How to apply where clause in multiple conditions
[英]MS-Access SQL: Multiple sum with different conditions grouped by ID
我有一個名為demo的表,結構如下
+------------+-------------+--------+
| CustomerID | Transaction | Points |
+------------+-------------+--------+
| 1 | Transfer | 230 |
| 2 | Accrual | 189 |
| 5 | Accrual | 121 |
| 1 | Usage | 306 |
| 3 | Accrual | 467 |
| 1 | Expiry | 328 |
| 2 | Accrual | 343 |
| 2 | Usage | 475 |
| 3 | Transfer | 194 |
| 1 | Accrual | 459 |
| 5 | Accrual | 314 |
+------------+-------------+--------+
所以我想根據交易類型獲得具有不同條件的積分總和,所以我所做的就像
SELECT *
FROM
(select sum(points) AS TransferedPoints from Demo where transaction="Transfer" ) AS TTbl,
(select sum(points) AS PointsAccruals from Demo where transaction="Accrual" ) AS ACTbl,
(select sum(points) AS PointsUsage from Demo where transaction="Usage") AS UsTbl,
(select sum(points)AS ExpiredPoints from Demo where transaction="Expiry" ) AS ExTbl;
結果就像
+------------------+--------------------+-----------------+-------------------+
| TransferedPoints | PointsAccruals | PointsUsage | ExpiredPoints |
+------------------+--------------------+-----------------+-------------------+
| 424 | 1893 | 781 | 328 |
+------------------+--------------------+-----------------+-------------------+
很好,但是我想按ID細分,我不知道該怎么做,我希望最終結果看起來像這樣
+-------------+----------------------+--------------------+-----------------+-------------------+
| Customer ID | TransferedPoints | PointsAccruals | PointsUsage | ExpiredPoints |
+-------------+----------------------+--------------------+-----------------+-------------------+
| 1 | 230 | 459 | 306 | 328 |
| 2 | | 532 | 475 | |
| 3 | 194 | 467 | | |
| 5 | | 435 | | |
+-------------+----------------------+--------------------+-----------------+-------------------+
謝謝
使用條件聚合!
SELECT ID, SUM(IIF(transaction = "Transfer", points, 0)) AS TransferedPoints,
SUM(IIF(transaction = "Accrual", points, 0)) AS AccrualPoints,
SUM(IIF(transaction = "Usage", points, 0)) AS UsagePoints,
SUM(IIF(transaction = "Expiry", points, 0)) AS ExpiryPoints
FROM DEMO
GROUP BY ID;
或者,如果您可以處理四行,請使用GROUP BY
:
select id, transaction, sum(points)
from demo
group by id, transaction;
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