回答編集履歴
1
ついき
test
CHANGED
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@@ -9,3 +9,51 @@
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9
9
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order by (length(replace(cont,'りんご',''))-length(cont) + length(replace(cont2,'りんご',''))-length(cont2))
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10
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11
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```
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---
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情報を小出しにして、使えない、自分で試し済みの回答がついた結果で得したのはPVがあがった運営ですか？
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18
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+
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nullが原因だと分かってて、自分でnullにしてるんですから、こうすればいいです。
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```SQL
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SELECT cont,cont2,0 as cont3,0 as cont4 FROM fruit WHERE cont LIKE '%りんご%' or cont2 LIKE '%りんご%'
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union all
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SELECT 0,0,cont3,cont4 FROM vegi WHERE cont4 LIKE '%りんご%'
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order by (LENGTH(cont) - LENGTH(REPLACE(cont,"りんご",""))) + (LENGTH(cont2) - LENGTH(REPLACE(cont2,"りんご",""))) + (LENGTH(cont4) - LENGTH(REPLACE(cont4,"りんご",""))) DESC
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```
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39
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selectでnullを設定している説明がまた本当じゃなくて、実際のcont1がnull許容で、セレクトしたカラムにnullが入ってるなら`ifnull((LENGTH(cont1) - LENGTH(REPLACE(cont1,"りんご",""))),0)`とかってやればいいです(ifnullは多分MySQL依存)
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例えば↓みたいなことすれば、nullを足すとどうなるかとか、ifnullでどうなるかとか分かります。
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```SQL
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SELECT (LENGTH(cont) - LENGTH(REPLACE(cont,"りんご",""))),(LENGTH(cont2) - LENGTH(REPLACE(cont2,"りんご",""))), ifnull((LENGTH(cont4) - LENGTH(REPLACE(cont4,"りんご",""))),0), (LENGTH(cont) - LENGTH(REPLACE(cont,"りんご",""))) + (LENGTH(cont2) - LENGTH(REPLACE(cont2,"りんご",""))) + (LENGTH(cont4) - LENGTH(REPLACE(cont4,"りんご",""))) FROM
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(SELECT cont,cont2,null as cont3,null as cont4 FROM fruit WHERE cont LIKE '%りんご%' or cont2 LIKE '%りんご%'
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51
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union all
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SELECT null,null,cont3,cont4 FROM vegi WHERE cont4 LIKE '%りんご%') as r
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```
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59
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teratailは、参考書的に使うにはまったくやりにくいのでお薦めできません
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