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I need to perform a summary calculation for the below mentioned table structure for i need to order by "sessionId" and subgroup by the "sequenceId". Particular session can have one or more sequence. each sequence starts with one and move ahead sequencailly. primary keys and flow-squence may not be in tandem.

table >>

pk_id  session-id    sequence   some_other columns
  1    AAAAAAAA          1        blah-blah-blah
  2    AAAAAAAA          2        blah-blah-blah 
  3    AAAAAAAA          3        blah-blah-blah
  4    AAAAAAAA          2        blah-blah-blah
  5    AAAAAAAA          1        blah-blah-blah
  6    AAAAAAAA          3        blah-blah-blah
  7    AAAAAAAA          3        blah-blah-blah
  8    AAAAAAAA          2        blah-blah-blah
  9    AAAAAAAA          1        blah-blah-blah

I need to order by

 pk_id  session-id    sequence   some_other columns
  1    AAAAAAAA          1        blah-blah-blah
  2    AAAAAAAA          2        blah-blah-blah 
  3    AAAAAAAA          3        blah-blah-blah

  5    AAAAAAAA          1        blah-blah-blah
  4    AAAAAAAA          2        blah-blah-blah
  6    AAAAAAAA          3        blah-blah-blah

  9    AAAAAAAA          1        blah-blah-blah
  8    AAAAAAAA          2        blah-blah-blah
  7    AAAAAAAA          3        blah-blah-blah

Any help would be appreciated.

4

1 に答える 1

3

sequence=1最初のものを最初sequence=2と最初のものとグループ化し、sequence=3同様に2番目1のものを2番目2と2番目のものとグループ化する場合3（pk_id順序として使用）、数値への変数割り当てをsequence使用し、結果の数値を並べ替えに使用できます。

これは私が意味することです：

SELECT
  pk_id,
  session_id,
  sequence,
  some_other_column
FROM (
  SELECT
    @row := (session_id = @sid AND sequence = @seq) * @row + 1 AS row,
    pk_id,
    @sid := session_id AS session_id,
    @seq := sequence AS sequence,
    some_other_column
  FROM
    atable,
    (SELECT @row := 0, @sid := '', @seq := 0) AS s
  ORDER BY
    session_id,
    sequence,
    pk_id
) AS s
ORDER BY
  session_id,
  row,
  sequence
;

このクエリはSQLFiddleでテストできます。

于 2013-03-10T23:02:08.597 に答える