回答編集履歴
1
調整
test
CHANGED
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@@ -10,3 +10,26 @@
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10
10
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select * from tbl
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11
11
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order by (表示価格='定価')*定価+(表示価格='割引')*割引価格 desc
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12
12
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```
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13
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+
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14
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# 調整
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15
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予め生成列を設定しておくという手もあります
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16
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```SQL
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17
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create table tbl(
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18
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id int primary key,
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商品 varchar(10),
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20
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定価 int,
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21
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割引価格 int,
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表示価格 enum('定価','割引'),
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価格 int as ((表示価格='定価')*定価+(表示価格='割引')*割引価格 )
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24
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);
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25
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26
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insert into tbl(id,商品,定価,割引価格,表示価格) values
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27
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(1,'A','15000','9000','定価'),
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28
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(2,'B','12000','10000','割引'),
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(3,'C','11000','5000','定価'),
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(4,'D','9000','8000','割引');
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31
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32
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select * from tbl
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33
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order by 価格 desc;
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34
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```
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35
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+
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