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在连接表中仅匹配每个记录一次

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我有两张 table . 第一个 inv 包含发票记录，第二个包含 payments . 我想通过 inv_amount 和 inv_date 匹配 inv 表中的付款 . 同一天可能有多个发票具有相同的金额，同一天也可能有多个相同金额的发票 .

付款应与第一个匹配的发票匹配，每笔付款只能匹配一次 .

这是我的数据：

表 inv

inv_id | inv_amount |  inv_date  | inv_number
--------+------------+------------+------------
      1 |         10 | 2018-01-01 |          1
      2 |         16 | 2018-01-01 |          1
      3 |         12 | 2018-02-02 |          2
      4 |         14 | 2018-02-03 |          3
      5 |         19 | 2018-02-04 |          3
      6 |         19 | 2018-02-04 |          5
      7 |          5 | 2018-02-04 |          6
      8 |         40 | 2018-02-04 |          7
      9 |         19 | 2018-02-04 |          8
     10 |         19 | 2018-02-05 |          9
     11 |         20 | 2018-02-05 |         10
     12 |         20 | 2018-02-07 |         11

表 pay

pay_id | pay_amount |  pay_date
--------+------------+------------
      1 |         10 | 2018-01-01
      2 |         12 | 2018-02-02
      4 |         19 | 2018-02-04
      3 |         14 | 2018-02-03
      5 |          5 | 2018-02-04
      6 |         19 | 2018-02-04
      7 |         19 | 2018-02-05
      8 |         20 | 2018-02-07

我的查询：

SELECT DISTINCT ON (inv.inv_id) inv.inv_id,
    inv.inv_amount,
    inv.inv_date,
    inv.inv_number,
    pay.pay_id
   FROM ("2016".pay
     RIGHT JOIN "2016".inv ON (((pay.pay_amount = inv.inv_amount) AND (pay.pay_date = inv.inv_date))))
  ORDER BY inv.inv_id

导致：

inv_id | inv_amount |  inv_date  | inv_number | pay_id
--------+------------+------------+------------+--------
      1 |         10 | 2018-01-01 |          1 |      1
      2 |         16 | 2018-01-01 |          1 |
      3 |         12 | 2018-02-02 |          2 |      2
      4 |         14 | 2018-02-03 |          3 |      3
      5 |         19 | 2018-02-04 |          3 |      4
      6 |         19 | 2018-02-04 |          5 |      4
      7 |          5 | 2018-02-04 |          6 |      5
      8 |         40 | 2018-02-04 |          7 |
      9 |         19 | 2018-02-04 |          8 |      6
     10 |         19 | 2018-02-05 |          9 |      7
     11 |         20 | 2018-02-05 |         10 |
     12 |         20 | 2018-02-07 |         11 |      8

记录 inv_id = 6 不应与 pay_id = 4 匹配，因为这意味着付款4已插入两次

期望的结果：

inv_id | inv_amount |  inv_date  | inv_number | pay_id
--------+------------+------------+------------+--------
      1 |         10 | 2018-01-01 |          1 |      1
      2 |         16 | 2018-01-01 |          1 |
      3 |         12 | 2018-02-02 |          2 |      2
      4 |         14 | 2018-02-03 |          3 |      3
      5 |         19 | 2018-02-04 |          3 |      4
      6 |         19 | 2018-02-04 |          5 |        <- should be empty**
      7 |          5 | 2018-02-04 |          6 |      5
      8 |         40 | 2018-02-04 |          7 |
      9 |         19 | 2018-02-04 |          8 |      6
     10 |         19 | 2018-02-05 |          9 |      7
     11 |         20 | 2018-02-05 |         10 |
     12 |         20 | 2018-02-07 |         11 |      8

免责声明：是的我昨天用原始数据问了这个问题，但是有人指出我的sql很难阅读 . 因此，我试图创建一个更清晰的问题表示 .

为方便起见，这里有一个要测试的SQL小提琴：http://sqlfiddle.com/#!17/018d7/1

sql postgresql

1 回答

  • 1

    看到这个例子之后我想我已经得到了你的问题：

    WITH payments_cte AS (
    SELECT
        payment_id,
        payment_amount,
        payment_date,
        ROW_NUMBER() OVER (PARTITION BY payment_amount, payment_date ORDER BY payment_id) AS payment_row
    FROM payments
), invoices_cte AS (
    SELECT
        invoice_id,
        invoice_amount,
        invoice_date,
        invoice_number,
        ROW_NUMBER() OVER (PARTITION BY invoice_amount, invoice_date ORDER BY invoice_id) AS invoice_row
    FROM invoices
)
SELECT invoice_id, invoice_amount, invoice_date, invoice_number, payment_id
FROM invoices_cte
LEFT JOIN payments_cte
    ON payment_amount = invoice_amount
    AND payment_date = invoice_date
    AND payment_row = invoice_row
ORDER BY invoice_id, payment_id
    回复于

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