回答編集履歴
2
修正
test
CHANGED
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@@ -28,6 +28,6 @@
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28
28
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29
29
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left join tableB as B2
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30
30
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31
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-
on A.商品ID = B2.在庫ID and B.販売ID is Null
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31
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+
on A.商品ID = B2.在庫ID and B2.販売ID is Null
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32
32
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33
33
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```
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1
追記
test
CHANGED
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@@ -13,3 +13,21 @@
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13
13
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on A.商品ID = coalesce(B.販売ID, B.在庫ID)
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14
14
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15
15
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```
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16
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+
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17
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+
上記は前回の回答の別バージョンなので、上記で遅い遅い場合は以下を試してみて下さい。
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18
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+
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19
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+
```SQL
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20
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+
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21
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+
select 商品ID, coalesce(B1.品目, B2.品目) as 品目
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22
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+
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23
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+
from tableA as A
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24
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+
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25
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+
left join tableB as B1
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26
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+
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27
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+
on A.商品ID = B1.販売ID
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28
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+
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29
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+
left join tableB as B2
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30
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+
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31
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+
on A.商品ID = B2.在庫ID and B.販売ID is Null
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32
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+
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33
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+
```
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