2

元のクエリは次のとおりです.... next_row_date '2013-01-01' の日付が fld_date の最後のレコードではなく、next_row_date の最後のレコードが '2013-01-15' であることがわかる場合は、0 でなければなりません.

+-----+---+------------+---------------+
| | シーケンス | 私 | fld_Date | next_row_date |
+-----+---+------------+---------------+
| | 41 | 1 | 2012-10-08 | 2012-10-15 |
| | 42 | 2 | 2012-10-15 | 2012-10-22 |
| | 43 | 3 | 2012-10-22 | 2012-10-29 |
| | 44 | 4 | 2012-10-29 | 2012-11-05 |
| | 45 | 5 | 2012-11-05 | 2012-11-12 |
| | 46 | 6 | 2012-11-12 | 2012-11-19 |
| | 47 | 7 | 2012-11-19 | 2013-01-01 |
| | 49 | 8 | 2013-01-08 | 2013-01-15 |
+-----+---+------------+---------------+

これが私が欲しかった出力です。このクエリで私を助けてもらえますか?

+-----+---+------------+---------------+
| | シーケンス | 私 | fld_Date | next_row_date |
+-----+---+------------+---------------+
| | 41 | 1 | 2012-10-08 | 2012-10-15 |
| | 42 | 2 | 2012-10-15 | 2012-10-22 |
| | 43 | 3 | 2012-10-22 | 2012-10-29 |
| | 44 | 4 | 2012-10-29 | 2012-11-05 |
| | 45 | 5 | 2012-11-05 | 2012-11-12 |
| | 46 | 6 | 2012-11-12 | 2012-11-19 |
| | 47 | 7 | 2012-11-19 | 2013-01-08 |
| | 49 | 8 | 2013-01-08 | 0 |
+-----+---+------------+---------------+

SELECT 
        db_lms.a.seq,
        (@i:=@i+1)AS i,
        db_lms.a.fld_Date,
        (db_lms.b.fld_Date)AS next_row_date
 FROM db_lms.lms_savings a, db_lms.lms_savings b, (SELECT @i:=0) ii
WHERE (db_lms.a.seq = db_lms.b.seq-1) ORDER BY db_lms.a.seq ASC;
4

1 に答える 1

1

試す

SELECT seq, @i := @i + 1 i, fld_Date, next_date
FROM
(
  SELECT seq, @d next_date, @d := fld_Date fld_Date
    FROM lms_savings, (SELECT @d := 0) d
  ORDER BY seq DESC
) q, (SELECT @i := 0) n 
ORDER BY seq

出力：

| | シーケンス | 私 | 私 | FLD_DATE | NEXT_DATE |
--------------------------------------
| | 41 | 1 | 2012-10-08 | 2012-10-15 |
| | 42 | 2 | 2012-10-15 | 2012-10-22 |
| | 43 | 3 | 2012-10-22 | 2012-10-29 |
| | 44 | 4 | 2012-10-29 | 2012-11-05 |
| | 45 | 5 | 2012-11-05 | 2012-11-12 |
| | 46 | 6 | 2012-11-12 | 2012-11-19 |
| | 47 | 7 | 2012-11-19 | 2013-01-08 |
| | 49 | 8 | 2013-01-08 | 0 |

これがSQLFiddle のデモです。

注: サンプル データ 47-49 のように seq 番号にギャップがあっても、クエリは機能します。

于 2013-06-27T01:46:29.070 に答える