回答編集履歴
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追加質問に対する回答を追記
test
CHANGED
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@@ -43,3 +43,65 @@
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GROUP BY T1.PC購入日
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```
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---
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**2021/12/23 10:20 追記**
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52
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> 「その日に使われたPC経由の注文数」
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> 「列の12月1日〜12月7日」
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> をいれる方法はありますでしょうか？
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やり方はいろいろあると思いますが、たとえば以下のようなSQLはどうでしょうか?
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64
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```SQL
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SELECT
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T1.PC購入日,
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(SELECT COUNT(*) FROM tbl T3 WHERE T1.PC購入日 = T3.購入日 AND 購入端末 = 'PC') AS PC購入数,
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COUNT(CASE WHEN T2.購入日 = '2021-12-01' THEN T1.userid END) AS "2021-12-01",
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COUNT(CASE WHEN T2.購入日 = '2021-12-02' THEN T1.userid END) AS "2021-12-02",
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COUNT(CASE WHEN T2.購入日 = '2021-12-03' THEN T1.userid END) AS "2021-12-03",
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COUNT(CASE WHEN T2.購入日 = '2021-12-04' THEN T1.userid END) AS "2021-12-04",
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COUNT(CASE WHEN T2.購入日 = '2021-12-05' THEN T1.userid END) AS "2021-12-05",
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COUNT(CASE WHEN T2.購入日 = '2021-12-06' THEN T1.userid END) AS "2021-12-06",
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COUNT(CASE WHEN T2.購入日 = '2021-12-07' THEN T1.userid END) AS "2021-12-07"
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FROM (
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SELECT userid, MIN(購入日) AS PC購入日
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FROM tbl
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WHERE 購入端末 = 'PC'
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GROUP BY userid
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) AS T1
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JOIN tbl AS T2 ON T1.userid = T2.userid AND T1.PC購入日 < T2.購入日
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WHERE T2.購入端末 = 'SP'
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GROUP BY T1.PC購入日
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```
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