回答編集履歴
1
chousei
test
CHANGED
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@@ -9,10 +9,6 @@
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9
9
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(5,'お',3,2);
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10
10
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11
11
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select *,CONCAT_WS(',',
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12
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-
case field(a,1,2) when 0 then null else 'a' end,
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13
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-
case field(b,1,2) when 0 then null else 'b' end) as x from posts
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14
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-
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15
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-
select *,CONCAT_WS(',',
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16
12
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case when field(a,1,2)>0 then 'a' end,
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17
13
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case when field(b,1,2)>0 then 'b' end
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18
14
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) as roots from posts
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