質問編集履歴
4
add data
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- 元データ
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| ymd | amt |
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| :---: | :---: |
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| 2015-03-01 | 10 |
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| 2016-01-01 | 10 |
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| 2016-02-25 | 20 |
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| 2016-03-01 | 10 |
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| 2016-07-20 | 30 |
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| 2017-01-02 | 40 |
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| 2017-02-20 | 50 |
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- 理想
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| y | amt |
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| :---: | :---: |
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| 2015 | 40 |
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| 2016 | 130 |
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###### 試したけど文法エラーに引っかかったSQL
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```sql
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3
fix question
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###### 試したけど
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###### 試したけど文法エラーに引っかかったSQL
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```sql
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2
fix
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###### 試したけどダメだったSQL
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```
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```sql
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select
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1
add error message
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date_format(date_sub(ymd, interval 2 month), '%Y')
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```
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```sql
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クエリーのエラー (1064): Syntax error near
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'group by date_format(date_sub(ymd, interval 2 month), '%Y')' at line 5
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```
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