回答編集履歴
2
追記
answer
CHANGED
@@ -12,4 +12,37 @@
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12
12
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left JOIN HOLIDAY h3
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ON h3.holiday_code='3000'
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and p.person_code = h3.person_code
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+
```
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16
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+
上記をイメージし易いような別な記述にすると、
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```SQL
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SELECT p.person_name
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, h1.used_date 代休, h2.used_date 有給, h3.used_date 怪我病欠
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FROM PERSON p
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left JOIN (
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select * from HOLIDAY where holiday_code='1000'
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) h1
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ON p.person_code = h1.person_code
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left JOIN (
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select * from HOLIDAY where holiday_code='2000'
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) h2
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ON p.person_code = h2.person_code
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left JOIN (
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select * from HOLIDAY where holiday_code='3000'
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) h3
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ON p.person_code = h3.person_code
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```
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where条件で指定しようとすると、
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```SQL
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SELECT p.person_name
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, h1.used_date 代休, h2.used_date 有給, h3.used_date 怪我病欠
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FROM PERSON p
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left JOIN HOLIDAY h1
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ON p.person_code = h1.person_code
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left JOIN HOLIDAY h2
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ON p.person_code = h2.person_code
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left JOIN HOLIDAY h3
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ON p.person_code = h3.person_code
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where (h1.holiday_code='1000' or h1.holiday_code is null)
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and (h2.holiday_code='2000' or h2.holiday_code is null)
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and (h3.holiday_code='3000' or h3.holiday_code is null)
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```
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1
訂正
answer
CHANGED
@@ -7,9 +7,9 @@
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7
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ON h1.holiday_code='1000'
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and p.person_code = h1.person_code
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left JOIN HOLIDAY h2
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-
ON
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ON h2.holiday_code='2000'
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and p.person_code = h2.person_code
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left JOIN HOLIDAY h3
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-
ON
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ON h3.holiday_code='3000'
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and p.person_code = h3.person_code
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15
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```
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