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feat: update sql solution to lc problem: No.1142 #1797

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merged 1 commit into from
Oct 13, 2023
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feat: update sql solution to lc problem: No.1142 #1797

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feat: update sql solution to lc problem: No.1142
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@thinkasany
thinkasany committed Oct 13, 2023
commit 80aa666e50f21c5c4f0a0a747b3100a55b1ab73b
16 changes: 13 additions & 3 deletions solution/1100-1199/1142.User Activity for the Past 30 Days II/README.md
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Original file line number Diff line number Diff line change
Expand Up @@ -75,13 +75,23 @@ Activity 表：
WITH
T AS (
SELECT
count(DISTINCT session_id) AS sessions
COUNT(DISTINCT session_id) AS sessions
FROM Activity
WHERE activity_date <= '2019-07-27' AND datediff('2019-07-27', activity_date) < 30
WHERE activity_date <= '2019-07-27' AND DATEDIFF('2019-07-27', activity_date) < 30
GROUP BY user_id
)
SELECT ifnull(round(avg(sessions), 2), 0) AS average_sessions_per_user
SELECT IFNULL(ROUND(AVG(sessions), 2), 0) AS average_sessions_per_user
FROM T;
```

```sql
SELECT
IFNULL(
ROUND(COUNT(DISTINCT session_id) / COUNT(DISTINCT user_id), 2),
0
) AS average_sessions_per_user
FROM Activity
WHERE DATEDIFF('2019-07-27', activity_date) < 30;
```

<!-- tabs:end -->
16 changes: 13 additions & 3 deletions solution/1100-1199/1142.User Activity for the Past 30 Days II/README_EN.md
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Original file line number Diff line number Diff line change
Expand Up @@ -71,13 +71,23 @@ Activity table:
WITH
T AS (
SELECT
count(DISTINCT session_id) AS sessions
COUNT(DISTINCT session_id) AS sessions
FROM Activity
WHERE activity_date <= '2019-07-27' AND datediff('2019-07-27', activity_date) < 30
WHERE activity_date <= '2019-07-27' AND DATEDIFF('2019-07-27', activity_date) < 30
GROUP BY user_id
)
SELECT ifnull(round(avg(sessions), 2), 0) AS average_sessions_per_user
SELECT IFNULL(ROUND(AVG(sessions), 2), 0) AS average_sessions_per_user
FROM T;
```

```sql
SELECT
IFNULL(
ROUND(COUNT(DISTINCT session_id) / COUNT(DISTINCT user_id), 2),
0
) AS average_sessions_per_user
FROM Activity
WHERE DATEDIFF('2019-07-27', activity_date) < 30;
```

<!-- tabs:end -->
6 changes: 3 additions & 3 deletions solution/1100-1199/1142.User Activity for the Past 30 Days II/Solution.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -2,10 +2,10 @@
WITH
T AS (
SELECT
count(DISTINCT session_id) AS sessions
COUNT(DISTINCT session_id) AS sessions
FROM Activity
WHERE activity_date <= '2019-07-27' AND datediff('2019-07-27', activity_date) < 30
WHERE activity_date <= '2019-07-27' AND DATEDIFF('2019-07-27', activity_date) < 30
GROUP BY user_id
)
SELECT ifnull(round(avg(sessions), 2), 0) AS average_sessions_per_user
SELECT IFNULL(ROUND(AVG(sessions), 2), 0) AS average_sessions_per_user
FROM T;