回答編集履歴
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追記
test
CHANGED
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@@ -7,3 +7,27 @@
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7
7
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SELECT SUBSTRING(mail,1,CHARINDEX(mail,'@')-1)
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8
8
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```
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10
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11
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12
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13
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NULLと@を含まない場合の対策版
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14
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15
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16
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17
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```SQL
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18
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SELECT
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CASE mail
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22
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WHEN NULL THEN
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NULL
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27
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ELSE
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28
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29
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SUBSTRING(mail,1,CASE CHARINDEX('@',mail) WHEN 0 THEN LEN(mail) ELSE CHARINDEX('@',mail)-1 END)
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30
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END;
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32
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33
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```
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