[英]CASE statement in WHERE clause to look for multiple values using IN
我正在尋找編寫 SQL 聲明,以根據一周中的當前日期報告不同的輪次。
因此,如果當天是星期一,我希望報告顯示有關“NOMN”、“EWM1”、“EWM2”和“SOMN”輪次的信息 - 但如果當天是星期二,我希望報告顯示輪次' NOTE'、'EWT1'、'EWT2'、'SOTE' 等適用於周三、周四、周五。
當前代碼如下
SELECT
insp_route_feat.insp_route_code,
insp_route_feat.site_code,
insp_route_feat.plot_number,
insp_route_feat.officer_code,
max (inspection_feature.feature_insp_date) as Last_Inspection_Date,
case
when max (inspection_feature.feature_insp_date) >=trunc(SYSDATE,'DD') then 'Inspected'
else 'Not Completed' end as Assigned
FROM
insp_route_feat
inner join inspection_feature on insp_route_feat.site_code = inspection_feature.site_code and
insp_route_feat.plot_number = inspection_feature.plot_number
WHERE insp_route_feat.insp_route_code =
(CASE WHEN to_char(sysdate,'DY') = 'MON' THEN 'NOMN'
WHEN to_char(sysdate,'D') = 'TUE' THEN 'NOTE'
ELSE null END)
group by
insp_route_feat.insp_route_code,
insp_route_feat.site_code,
insp_route_feat.plot_number,
insp_route_feat.officer_code
我希望 WHERE 聲明說的是
WHERE insp_route_feat.insp_route_code IN (
(CASE WHEN to_char(sysdate,'DY') = 'MON' THEN 'NOMN','EWM1','EWM2','SOMN'
WHEN to_char(sysdate,'D') = 'TUE' THEN 'NOTE','EWT2','EWT2','SOTE'
ELSE null END)
但是我知道編碼是錯誤的,但希望這能讓我了解我所追求的。
Boolean 邏輯比用case
表達式更容易表達這樣的邏輯:
WHERE (to_char(sysdate,'DY') = 'MON' and insp_route_feat.insp_route_code IN ('NOMN','EWM1','EWM2','SOMN'))
OR (to_char(sysdate,'DY') = 'TUE' and insp_route_feat.insp_route_code IN ('NOTE','EWT2','EWT2','SOTE'))
只需使用 boolean 表達式:
WHERE ( to_char(sysdate, 'DY') = 'MON' and
insp_route_feat.insp_route_code IN ('NOMN', 'EWM1', 'EWM2', 'SOMN')
) OR
( to_char(sysdate, 'DY') = 'TUE' and
insp_route_feat.insp_route_code IN ('NOTE', 'EWT2', 'EWT2', 'SOTE')
)
WHERE
子句中很少需要CASE
表達式。 請注意,我還修復了第二個條件以使用'DY'
而不是'D'
。
是的,boolean 表達式使它更容易,但如果你想在where
子句中使用case when
語句,那么有一個選項如下:
CASE
WHEN to_char(sysdate, 'DY') = 'MON'
and insp_route_feat.insp_route_code IN ('NOMN', 'EWM1', 'EWM2', 'SOMN')
THEN 1
WHEN to_char(sysdate, 'DY') = 'TUE'
and insp_route_feat.insp_route_code IN ('NOTE', 'EWT2', 'EWT2', 'SOTE')
THEN 1
END = 1
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