[英]Oracle SQL - Case statement with iteration
應將 ASCII 表值與 s.manure_type 進行比較。 對於下表中的每條記錄,QuantityText case 語句都應該做一個比較。 它需要選擇的值是例如燕麥,天鵝絨豆,其他無。
select
c.id customer_num,
c.type type,
s.id_text sample_num,
c.sasa_grower_code s_grower,
c.address s_address1,
c.postalcode s_post_code,
c.email q1_email,
nvl(c.client_name, c.farm_name )s_company,
c.farm_name s_estate,
c.contact_name s_contact,
s.id_numeric id_numeric,
s.id_text fas_lab_id,
s.date_received received_date,
s.date_printed printed_date,
s.sampled_date sampled_date,
e.name S_AREA_DESCRIP,
a.name s_advisor_name,
a.email s_advisor_email,
s.order_no s_order_num,
s.field_name s_field,
p.phrase_text || ' cm' sample_depth,
cr.crop_name s_crop,
s.attyield s_yield,
s.variety s_varty,
case when s.flg_trashed is null then
'None'
else (case when s.flg_trashed = constant_pkg.get_true then
'Yes'
else (case when s.flg_trashed = constant_pkg.get_false then
'No'
else ' '
end)
end) end trashed,
case when s.flg_irrigated is null then
'None'
else (case when s.flg_irrigated = constant_pkg.get_true then
'Yes'
else (case when s.flg_irrigated = constant_pkg.get_false then
'No'
else ' '
end)
end) end s_irrig,
CASE
WHEN trim(s.manure_type) in (select p.phrase_id from phrase p where p.phrase_type = 'AL_G_MANUR') then (select p.phrase_text from phrase p)
END AS QuantityText,
'' S_GM_YIELD,
s.project_code project_code,
s.trial_ref trial_ref,
s.cost_centre cost_centre
from client c
left outer join sample s on (s.client_id = c.id)
left outer join extension e on (e.id = c.extension_id)
left outer join advisor a on (a.id = c.advisor_id)
left outer join phrase p on (p.phrase_id = s.depth)
left outer join crop cr on (cr.id = s.crop_id)
where p.phrase_type = phrase_pkg.get_soil_depth
and c.id = '211493A'
and s.fas_sample_type = sample_pkg.get_soil_sample
and s.flg_recommendation = sample_pkg.get_flg_recommendation
and s.id_numeric between 14932 and 14933
+----------------------------+
| Phrase |
+----------------------------+
|AL_G_MANUR OA Oats |
|AL_G_MANUR V Velvet Beans
|AL_G_MANUR O Other
|AL_G_MANUR N None |
+----------------------------+
但我收到錯誤 ORA-00900:單行查詢返回多於一行
其中一個 case 語句中缺少 where 子句很可能是原因。
CASE
WHEN trim(s.manure_type) in
(select p.phrase_id from phrase p where p.phrase_type = 'AL_G_MANUR')
then (select p.phrase_text from phrase p) <<< NO WHERE CLAUSE ?
END AS QuantityText,
這個比較容易自己調試。
問題出在以下語句中
then (select p.phrase_text from phrase p)
我想,應該用這個代替
(select p.phrase_text from phrase p where p.phrase_type = 'AL_G_MANUR')
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