SQL 使用附加列旋转 Table

Question

我正在使用 Codeigniter 和 Mysql 为一家小型快递公司构建一个快递系统。我想要做的是建立一个枢轴 table，它将显示每个运单的特定付款类型的总付款，包括总计。

我现在有这个查询：

SELECT IFNULL( p.waybill_number,  'GrandTotal' ) AS Waybill, w.consignee, w.consignor,
       SUM( IF(       p.payment_terms =  'prepaid', p.amount, NULL ) ) AS Prepaid,
       SUM( IF( p.payment_terms =  'collect', p.amount, NULL ) ) AS Collect
FROM payment p JOIN
     waybill w
     ON p.waybill_number = w.waybill_number
GROUP BY p.waybill_number WITH ROLLUP

但这在最后一行显示收货人和收货人的值。我想要的是只显示最后一行中所有 "PREPAID" 和 "COLLECT" 交易的 GrandTotal。希望能帮到你。

提前致谢！！！

更新::: 我编辑了查询，现在看起来像这样...

SELECT
IFNULL(mw.waybill_number, 'GrandTotal') as Waybill,
CASE WHEN mw.waybill_number THEN c1.name ELSE NULL END as Consignee,
CASE WHEN mw.waybill_number THEN c2.name ELSE NULL END as Consignee,
SUM(IF(p.payment_terms = 'prepaid', p.amount, NULL)) as Prepaid,
SUM(IF(p.payment_terms = 'collect', p.amount, NULL)) as Collect
FROM manifest_waybill mw
JOIN waybill w
on w.waybill_number = mw.waybill_number
LEFT JOIN payment p
on p.waybill_number = mw.waybill_number
JOIN customer c1
on c1.customer_id = w.consignee
JOIN customer c2
on c2.customer_id = w.consignor
WHERE manifest_number = 103
GROUP BY mw.waybill_number WITH ROLLUP

查询运行但结果不是我所期望的。此查询在每一行中重复收货人和发货人的值。

我希望结果是这样的：

运单# |收货人 |发货人 |

1216415 |一个| B|

1216416 |丙 | D|

1216417 |E | F|

发生的事情是：

运单# |收货人 |发货人 |

1216415 |乙 | F|

1216416 |乙 | F|

1216417 |乙 | F|

最后一行 (121617) 的值在每一行中重复出现

Answer 1

如果我没理解错的话，就用一个case语句：

SELECT IFNULL(p.waybill_number,  'GrandTotal' ) AS Waybill,
       (CASE WHEN p.waybill_number IS NOT NULL THEN w.consignee END) as consignee,
       (CASE WHEN p.waybill_number IS NOT NULL THEN w.consignor END) as consignor,
       SUM(IF(p.payment_terms =  'prepaid', p.amount, NULL ) ) AS Prepaid,
       SUM(IF( p.payment_terms =  'collect', p.amount, NULL ) ) AS Collect
FROM payment p JOIN
     waybill w
     ON p.waybill_number = w.waybill_number
GROUP BY p.waybill_number WITH ROLLUP;

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