質問編集履歴
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データを
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データを横持ちにするSQL
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今sqlで集計する方法を迷っています。
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購買系のテーブルを集計して、月毎のUUユーザーの利用数と１人当たりの平均利用回数を求めたい。
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DBはBQです。
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テーブル情報(event)
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・id(primary)：連番
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・month：利用月
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・user_id：ユーザーID
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・category：カテゴリ
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一つの項目であれば、
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```sql
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WITH
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data AS (
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SELECT
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month,
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COUNT(user_id) AS user_cnt
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FROM
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event
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GROUP BY
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month,
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user_id )
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SELECT
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month,
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COUNT(user_cnt) AS UU,
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AVG(user_cnt) AS uer_avg
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FROM
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data
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GROUP BY
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month
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```
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これを、category(pc,sp,app)の３種類でUUに分けて、横持ちにしたい場合
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```sql
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WITH
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data AS (
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SELECT
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month,
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COUNT(CASE WHEN category="pc" THEN 1 ELSE NULL END) AS user_pc_cnt,
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COUNT(CASE WHEN category="sp" THEN 1 ELSE NULL END) AS user_sp_cnt,
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COUNT(CASE WHEN category="app" THEN 1 ELSE NULL END) AS user_app_cnt,
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FROM
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event
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GROUP BY
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month,
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category,
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user_id )
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SELECT
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month,
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COUNT(CASE WHEN user_pc_cnt > 0 THEN 1 ELSE NULL END) AS pc_UU,
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coalesce( AVG(CASE WHEN user_pc_cnt > 0 THEN user_pc_cnt ELSE NULL END),0) AS user_pc_avg,
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COUNT(CASE WHEN user_sp_cnt > 0 THEN 1 ELSE NULL END) AS sp_UU,
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coalesce( AVG(CASE WHEN user_sp_cnt > 0 THEN user_sp_cnt ELSE NULL END),0) AS user_sp_avg,
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COUNT(CASE WHEN user_app_cnt > 0 THEN 1 ELSE NULL END) AS app_UU,
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coalesce( AVG(CASE WHEN user_app_cnt > 0 THEN user_app_cnt ELSE NULL END),0) AS user_app_avg,
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FROM
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data
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GROUP BY
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month
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```
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となる。
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1
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SQLでデータを横持ちにする場合はcase文を乱用しているが他に方法はあるのか？
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136
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137
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もっとうまい書き方ありますかね？
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1
DB種類について
test
CHANGED
|
File without changes
|
test
CHANGED
|
@@ -1,6 +1,10 @@
|
|
|
1
1
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今sqlで集計する方法を迷っています。
|
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2
2
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3
3
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購買系のテーブルを集計して、月毎のUUユーザーの利用数と１人当たりの平均利用回数を求めたい。
|
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4
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+
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7
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DBはBQです。
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