回答編集履歴
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追記
answer
CHANGED
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@@ -2,4 +2,5 @@
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2
2
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```SQL
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3
3
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select TIMEDIFF(time('18:00'),time('24:30'));
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4
4
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//-06:30:00
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5
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-
```
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5
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+
```
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6
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+
[参考ページ](http://blog.livedoor.jp/crimsonblow/archives/51191983.html)
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