Question

我现在需要通过多个连接按位置检索最新的loadid。例如，ibiza的最新装载量为692，有2条记录。下面的查询检索该位置的所有loadid，而不仅仅是最大值。如何通过以下查询中的max（loadid）按位置恢复最新记录：

select
MAX(t.loadid) AS loadid,
a.process_id,
p.partitionkey,
-- t.partitionkey,
p.partdesc,
p.partname,
c.catname,
r.rule_name,
r.file_path,
a.execution_start_time,
a.execution_end_time,
a.records_processed
--  a.status,
--  a.last_updated_by as processed_by,
--  a.last_update_date
FROM
data t
INNER JOIN part p
ON t.partitionkey = p.partitionkey
INNER JOIN process a
ON t.loadid = a.process_id
INNER JOIN categ c
ON t.catkey = c.catkey
INNER JOIN balance r
ON t.RULE_ID = r.RULE_ID
WHERE
p.partname = 'ibiza'
GROUP BY
t.loadid,
a.process_id,
p.partitionkey,
t.partitionkey,
p.partdesc,
p.partname,
c.catname,
r.rule_name,
r.file_path,
a.execution_start_time,
a.execution_end_time,
a.records_processed;

Answer 1

您可以使用CTE：

;WITH MaxLoadId AS
(
    select MAX(t.loadid) AS loadid, p.partitionkey, p.partdesc, p.partname
    FROM data t
        INNER JOIN part p ON t.partitionkey = p.partitionkey
    WHERE p.partname = 'ibiza'
    GROUP BY p.partitionkey, p.partdesc, p.partname
)
select
    mli.loadid AS loadid,
    a.process_id,
    mli.partitionkey,
    -- t.partitionkey,
    mli.partdesc,
    mli.partname,
    c.catname,
    r.rule_name,
    r.file_path,
    a.execution_start_time,
    a.execution_end_time,
    a.records_processed
    --  a.status,
    --  a.last_updated_by as processed_by,
    --  a.last_update_date
FROM MaxLoadId mli
    INNER JOIN data t ON mli.loadid = t.loadid
    INNER JOIN process a ON mli.loadid = a.process_id
    INNER JOIN categ c ON t.catkey = c.catkey
    INNER JOIN balance r ON t.RULE_ID = r.RULE_ID

需要max（id）多行，但我收到多个max id＆＃39; s

1 个答案: