[英]How do I select one row in SQL when another row has same id but a different value in a column?
[英]Select row with ID, different value in other column SQL Access
我有這個:
ID ABCD ID2
1 | 1 | 1 | 1 | 1 | 1個
1 | 1 | 1 | 1 | 1 | 1個
1 | 1 | 1 | 1 | 1 | 2
1 | 1 | 1 | 1 | 1 | 3
2 | 1 | 1 | 1 | 1 | 1個
2 | 1 | 1 | 1 | 1 | 2
2 | 1 | 1 | 1 | 1 | 3
3 | 1 | 1 | 1 | 1 | 1個
3 | 1 | 1 | 1 | 1 | 1個
3 | 1 | 1 | 1 | 1 | 1個
3 | 1 | 1 | 1 | 1 | 2
3 | 1 | 1 | 1 | 1 | 2
3 | 1 | 1 | 1 | 1 | 2
它需要做的是始終向我顯示ID的第一條記錄。 如果值ID2更改,那也必須顯示。 所以它應該看起來像這樣:
ID ABCD ID2
1 | 1 | 1 | 1 | 1 | 1個
1 | 1 | 1 | 1 | 1 | 2
1 | 1 | 1 | 1 | 1 | 3
2 | 1 | 1 | 1 | 1 | 1個
2 | 1 | 1 | 1 | 1 | 2
2 | 1 | 1 | 1 | 1 | 3
3 | 1 | 1 | 1 | 1 | 1個
3 | 1 | 1 | 1 | 1 | 2
我已經這樣嘗試過,但是效果不好。 它沒有給我第一個值ID的記錄,並且ID2不變時,我仍然得到雙精度值。
SELECT
IIf(IsNull(m.bsn),'',CStr(m.bsn)) AS BSN,
IIf(IsNull(m.uitkering),'',CStr(m.uitkering)) AS Uitkering,
IIf(IsNull(m.ingangsdatum),'',Format(m.ingangsdatum,'dd-mm-yyyy')) AS IngangsdatumUitkering,
IIf(IsNull(m.eerste_ziektedag),'',Format(m.eerste_ziektedag,'dd-mm-yyyy')) AS EersteZiektedag,
IIf(IsNull(m.ingangsdatum_w),'',Format(m.ingangsdatum_w,'dd-mm-yyyy')) AS DatumWijziging,
IIf(IsNull(m.ao_percentage),'',CStr(m.ao_percentage)) AS PercentageUitkering
FROM (((mutatie_historie AS m LEFT JOIN recht_soorten AS rs ON rs.recht_soort_id = m.recht_soort_id)
LEFT JOIN uitkering_soorten AS us ON us.uitkering_soort_id = m.uitkering_soort_id)
LEFT JOIN ao_klassen AS aok ON aok.ao_klasse_id = m.ao_klasse_id)
LEFT JOIN kenmerk_percentage_uitkering AS kpu ON kpu.kenmerk_code = m.kenmerk_code
WHERE m.ongemax_dagloon > '0'
AND (m.ao_percentage <> (SELECT TOP 1 m9.ao_percentage FROM mutatie_historie m9 WHERE m.bsn < m9.bsn AND m.ingangsdatum_w < m9.ingangsdatum_w ))
AND not exists
(SELECT null FROM mutatie_historie m2 WHERE m2.aanlevering > m.aanlevering AND m2.ingangsdatum_w <= m.ingangsdatum_w AND m2.bsn = m.bsn AND
(SELECT Iif(IsNull(m3.uitkering), '', m3.uitkering) FROM mutatie_historie m3 WHERE m3.bsn = m2.bsn AND m3.aanlevering = m2.aanlevering AND m3.keynummer =
(SELECT min(keynummer) FROM mutatie_historie m4 WHERE m4.bsn = m3.bsn AND m4.aanlevering = m3.aanlevering AND m4.uitkering is not null) ) =
(SELECT Iif(IsNull(m3.uitkering), '', m3.uitkering) FROM mutatie_historie m3 WHERE m3.bsn = m.bsn AND m3.aanlevering = m.aanlevering AND m3.keynummer =
(SELECT min(keynummer) FROM mutatie_historie m4 WHERE m4.bsn = m3.bsn AND m4.aanlevering = m3.aanlevering AND m4.uitkering is not null) ) )
ORDER BY m.bsn, m.ingangsdatum_w, m.ao_percentage DESC;
這是我的整個代碼。 所有部分都是必需的,這是它涉及的部分:
AND (m.ao_percentage <> (SELECT TOP 1 m9.ao_percentage FROM mutatie_historie m9 WHERE m.bsn < m9.bsn AND m.ingangsdatum_w < m9.ingangsdatum_w ))
你應該用與眾不同的方式
select distinct ID, ID2
from your table
它是基本的GROUP BY
。
詢問
SELECT ID, ID2
FROM your_table_name
GROUP BY ID, ID2
ORDER BY ID, ID2;
首先,為什么需要這樣的表結構? 也許您應該首先重新考慮數據庫設計。
然后,您可能會執行以下操作:
SELECT DISTINCT ID, ID2
FROM table_name;
要從ao_percentage
的m9
的第一行獲取m.bsn
,請m.ingangsdatum_w
...
(SELECT TOP 1 m9.ao_percentage FROM mutatie_historie m9 WHERE m.bsn < m9.bsn AND m.ingangsdatum_w < m9.ingangsdatum_w ORDER BY m9.bsn, m9.ingangsdatum_w)
...
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.