由于数据未正确获取，以下外部联接的使用是否正确

Question

您好，我在表格中有以下数据 Exsiting data 通过下面的查询，我只得到普通的优惠券 Output

但是我还需要没有具有相应 -ve 的凭证的行（它基本上是出售的凭证和兑换的凭证。）

因此，仅售出和兑换了 1 张优惠券，还有一张尚未兑换。 如何恢复尚未赎回的行。

SELECT t1.STORE,
       t1.DAY,
       t1.tran_seq_no,
       t2.tran_seq_no,
       t2.DAY,
       t1.tender_amt,
       t2.tender_amt,
       t1.voucher_no,
       t2.voucher_no 
FROM   sa_tran_tender t1,
       sa_tran_tender t2
where  t1.voucher_no(+)=t2.voucher_no
AND    t1.DAY=4
AND    t1.tender_amt<0
AND    t1.tender_type_group ='VOUCH' 
AND    t2.tender_amt>0
AND    t1.STORE=400112
AND    t1.tran_seq_no       IN(2632729010,2632729056,3140772029)
AND    t1.STORE(+)=t2.STORE
and    t1.tender_type_group(+)=t2.tender_type_group;

Answer 1

当您使用 oracle joun 语法时，您应该将(+) 添加到左连接表的WHERE 条件中的每个字段（不仅适用于与另一个表连接的字段） -

where  t1.voucher_no(+)=t2.voucher_no
AND    t1.DAY=4(+)
AND    t1.tender_amt(+)<0
AND    t1.tender_type_group(+) ='VOUCH' 
AND    t2.tender_amt>0
AND    t1.STORE(+)=400112
AND    t1.tran_seq_no(+) IN(2632729010,2632729056,3140772029)
AND    t1.STORE(+)=t2.STORE
and    t1.tender_type_group(+)=t2.tender_type_group

或者您可以使用 ANSI 连接。

Answer 2

假设将有单次代金券销售（带有负数tender_amt），然后是单次可选的代金券兑换（正数tender_amt 和后来的tran_seq_no），那么您不需要使用自加入；相反，您可以使用LAG 或LEAD 分析函数（与自连接的两个表扫描相比，只需要一个表扫描）：

SQL Fiddle

Oracle 11g R2 架构设置：

CREATE TABLE sa_tran_tender ( store, day, tran_seq_no, voucher_no, tender_amt, tender_type_group ) AS
SELECT 400112, 4, 2632729010, '400112*101*21090', -39.95, 'VOUCH' FROM DUAL UNION ALL
SELECT 400112, 4, 2632729056, '400112*101*21136',  -6.99, 'VOUCH' FROM DUAL UNION ALL
SELECT 400112, 5, 3140772029, '400112*101*21090',  39.95, 'VOUCH' FROM DUAL;

查询 1：

SELECT *
FROM   (
  SELECT t.*,
         LEAD( DAY )         OVER ( PARTITION BY voucher_no, store, tender_type_group ORDER BY tran_seq_no ) AS redeemed_day,
         LEAD( tender_amt )  OVER ( PARTITION BY voucher_no, store, tender_type_group ORDER BY tran_seq_no ) AS redeemed_amt,
         LEAD( tran_seq_no ) OVER ( PARTITION BY voucher_no, store, tender_type_group ORDER BY tran_seq_no ) AS redeemed_tran_seq_no
  FROM   sa_tran_tender t
)
WHERE  tran_seq_no       IN( 2632729010, 2632729056, 3140772029)
AND    tender_type_group ='VOUCH' 
AND    STORE             =400112
AND    DAY               =4

Results：

|  STORE | DAY | TRAN_SEQ_NO |       VOUCHER_NO | TENDER_AMT | TENDER_TYPE_GROUP | REDEEMED_DAY | REDEEMED_AMT | REDEEMED_TRAN_SEQ_NO |
|--------|-----|-------------|------------------|------------|-------------------|--------------|--------------|----------------------|
| 400112 |   4 |  2632729010 | 400112*101*21090 |     -39.95 |             VOUCH |            5 |        39.95 |           3140772029 |
| 400112 |   4 |  2632729056 | 400112*101*21136 |      -6.99 |             VOUCH |       (null) |       (null) |               (null) |

但是，如果您确实想使用（低效）自联接，那么您可以这样做：

SELECT t1.STORE,
       t1.DAY,
       t1.tran_seq_no,
       t2.tran_seq_no,
       t2.DAY,
       t1.tender_amt,
       t2.tender_amt,
       t1.voucher_no,
       t2.voucher_no 
FROM   sa_tran_tender t1
       LEFT OUTER JOIN
       sa_tran_tender t2
       ON (    t1.voucher_no        = t2.voucher_no
           AND t2.tender_amt        > 0
           AND t1.store             = t2.store
           AND t1.tender_type_group = t2.tender_type_group )
WHERE  t1.DAY               = 4
AND    t1.tender_amt        < 0
AND    t1.tender_type_group = 'VOUCH' 
AND    t1.STORE             = 400112
AND    t1.tran_seq_no       IN (2632729010,2632729056,3140772029);