在两个表中显示两个表与一个UNION

Question

我有一个SQL查询，我必须从两个不同的表中获取值（说a1，a2）。出于简单的原因，它的工作原理，但因为我有一个UNION在同一个查询中有一个重要的原因（从表a2中获取值放置在a1的列值之间），由于这个原因，我的查询结果变得很奇怪。这是我的查询和图像，它显示了同样TICKET_ID的重复条目，我想删除它，怎么样？

QUERY

SELECT 
RECEIPTS.DATENEW AS DATE, 
TICKETS.TICKETID AS TICKETID, 
PAYMENTS.PAYMENT AS PAYMENT, 
PAYMENTS.TOTAL AS TOTAL, 
CUSTOMERS.NAME AS NAME, 
ADJUSTMENTS.ADJUSTMENT_REASON AS REASON 
FROM RECEIPTS 
INNER JOIN TICKETS ON RECEIPTS.ID = TICKETS.ID 
INNER JOIN PAYMENTS ON RECEIPTS.ID = PAYMENTS.RECEIPT 
INNER JOIN CUSTOMERS ON TICKETS.CUSTOMER = CUSTOMERS.ID 
RIGHT JOIN ADJUSTMENTS ON ADJUSTMENTS.CUSTOMER_ID = CUSTOMERS.ID 
WHERE 
(PAYMENTS.PAYMENT = 'debt' 
OR PAYMENTS.PAYMENT = 'debtpaid') 
UNION SELECT 
ADJUSTMENTS.DATE AS DATE, 
ADJUSTMENTS.TICKET_NO AS TICKETID, 
ADJUSTMENTS.ADJUSTMENT_TYPE AS PAYMENT, 
ADJUSTMENTS.ADJUSTMENT_AMOUNT * -1 AS TOTAL, 
ADJUSTMENTS.CUSTOMER_NAME AS NAME, 
ADJUSTMENTS.ADJUSTMENT_REASON AS REASON 
FROM ADJUSTMENTS 
ORDER BY NAME ASC, DATE DESC 

，这里是它的输出图像

输出

Answer 1

最后我想通了，现在查询变得如下

SELECT 
RECEIPTS.DATENEW AS DATE, 
TICKETS.TICKETID AS TICKETID, 
PAYMENTS.PAYMENT AS PAYMENT, 
PAYMENTS.TOTAL AS TOTAL, 
CUSTOMERS.NAME AS NAME, 
(SELECT ADJUSTMENTS.ADJUSTMENT_REASON FROM ADJUSTMENTS WHERE ADJUSTMENTS.ADJUSTMENT_TYPE != 'adjustment' AND ADJUSTMENTS.ADJUSTMENT_REASON != '') AS REASON 
FROM RECEIPTS 
INNER JOIN TICKETS ON RECEIPTS.ID = TICKETS.ID 
INNER JOIN PAYMENTS ON RECEIPTS.ID = PAYMENTS.RECEIPT 
INNER JOIN CUSTOMERS ON TICKETS.CUSTOMER = CUSTOMERS.ID 
WHERE 
(PAYMENTS.PAYMENT = 'debt' 
OR PAYMENTS.PAYMENT = 'debtpaid') 
UNION SELECT 
ADJUSTMENTS.DATE AS DATE, 
ADJUSTMENTS.TICKET_NO AS TICKETID, 
ADJUSTMENTS.ADJUSTMENT_TYPE AS PAYMENT, 
ADJUSTMENTS.ADJUSTMENT_AMOUNT * -1 AS TOTAL, 
ADJUSTMENTS.CUSTOMER_NAME AS NAME, 
ADJUSTMENTS.ADJUSTMENT_REASON AS REASON 
FROM ADJUSTMENTS 
ORDER BY NAME ASC, DATE DESC 

Answer 2

您可以使用GROUP BY或只是检查原因列不null

SELECT q.* FROM (

SELECT 
RECEIPTS.DATENEW AS DATE, 
TICKETS.TICKETID AS TICKETID, 
PAYMENTS.PAYMENT AS PAYMENT, 
PAYMENTS.TOTAL AS TOTAL, 
CUSTOMERS.NAME AS NAME, 
ADJUSTMENTS.ADJUSTMENT_REASON AS REASON 
FROM RECEIPTS 
INNER JOIN TICKETS ON RECEIPTS.ID = TICKETS.ID 
INNER JOIN PAYMENTS ON RECEIPTS.ID = PAYMENTS.RECEIPT 
INNER JOIN CUSTOMERS ON TICKETS.CUSTOMER = CUSTOMERS.ID 
RIGHT JOIN ADJUSTMENTS ON ADJUSTMENTS.CUSTOMER_ID = CUSTOMERS.ID 
WHERE 
(PAYMENTS.PAYMENT = 'debt' 
OR PAYMENTS.PAYMENT = 'debtpaid') 
UNION SELECT 
ADJUSTMENTS.DATE AS DATE, 
ADJUSTMENTS.TICKET_NO AS TICKETID, 
ADJUSTMENTS.ADJUSTMENT_TYPE AS PAYMENT, 
ADJUSTMENTS.ADJUSTMENT_AMOUNT * -1 AS TOTAL, 
ADJUSTMENTS.CUSTOMER_NAME AS NAME, 
ADJUSTMENTS.ADJUSTMENT_REASON AS REASON 
FROM ADJUSTMENTS 
ORDER BY NAME ASC, DATE DESC) q GROUP BY q.TICKETID 

OR

ORDER BY NAME ASC, DATE DESC) q GROUP BY q.REASON !='' // q.REASON IS NOT NULL