需要获得公共列条目的第一行，但要排除具有特定列值的行

Question

我需要从表'category_vouchers'中获得第一行，其ID_new_record列中的值相同，但需要排除分配的= 1

我的查询也得到assigned = 1

选择cv.id_voucher，nc.id，nc.name作为值，nc.result_text作为resultText，cv.assigned     来自category_vouchers简历     左JOIN category_vouchers cv2开启（cv.id_new_record =         cv2.id_new_record和cv.id_voucher> cv2.id_voucher）     在nc.id = cv.id_new_record上内部加入new_record nc     cv2.id_voucher在哪里为空

我希望获得id_voucher 7、3和5

Answer 1

您只需使用 SUBQUERY和JOIN

即可解决该问题

select cv.id_voucher, nc.id, nc.name as value, nc.result_text as resultText, cv.assigned 
FROM category_vouchers cv 
LEFT JOIN (SELECT * FROM category_vouchers WHERE assigned = 0) cv2 ON ( cv.id_new_record = cv2.id_new_record AND cv.id_voucher > cv2.id_voucher) 
INNER JOIN new_record nc on nc.id = cv.id_new_record 
WHERE cv2.id_voucher IS NULL AND cv.assigned = 0

Answer 2

请尝试这个

SELECT cv.id_voucher, nc.id, nc.name AS value, nc.result_text AS resultText, cv.assigned
FROM category_vouchers cv
LEFT JOIN category_vouchers cv2 ON (cv.id_new_record = cv2.id_new_record AND cv.id_voucher > cv2.id_voucher)
INNER JOIN new_record nc ON nc.id = cv.id_new_record
WHERE cv2.id_voucher IS NULL AND cv.assigned <> 1
GROUP BY cv.id_new_record

要从sql_mode中删除ONLY_FULL_GROUP_BY

SET GLOBAL sql_mode=(SELECT REPLACE(@@sql_mode,'ONLY_FULL_GROUP_BY',''));

Answer 3

尝试这个

    SELECT cv.id_voucher, nc.id, nc.name as value, nc.result_text as resultText, cv.assigned     
    FROM category_vouchers cv INNER JOIN
        (
            SELECT id_voucher, MIN(id_voucher) minid
            FROM category_vouchers
            where assigned != 1
            GROUP BY id_voucher
        ) t ON cv.id_voucher = t.id_voucher AND cv.id_voucher = t.minid
 inner join new_record nc on nc.id = cv.id_new_record WHERE cv2.id_voucher IS NULL