Here is the modified code:

```sql
WITH install AS (
SELECT
el.user_id,
el.create_time
FROM
event_logs el
WHERE
el.event_id = 'onboarding_login_view'
AND el.referrer = 'plugin_installed'
),

first_usage_after_installed AS (
SELECT
i.user_id,
i.create_time,
COALESCE(min(cr.event_time), toDateTime('1970-01-01 00:00:00')) AS first_event_time
FROM
install i
LEFT JOIN
chat_records cr ON i.user_id = cr.user_id
WHERE
cr.event_time i.create_time
GROUP BY
i.user_id, i.create_time
)

SELECT
i.user_id,
i.create_time AS install_time,
f.first_event_time AS first_usage_time
FROM
install i
LEFT JOIN
first_usage_after_installed f ON i.user_id = f.user_id AND i.create_time = f.create_time
```

This code first creates a temporary table `install` to store the user_id and create_time of users who installed the plugin. Then it creates another temporary table `first_usage_after_installed` to store the user_id, create_time and the time of the first event after installation. If there is no event after installation, the time will be set to '1970-01-01 00:00:00'. Finally, it selects the user_id, install_time and first_usage_time from these two tables. If a user has not used the plugin after installation, the first_usage_time will be '1970-01-01 00:00:00'.

Question

Here is the modified code:

```sql
WITH install AS (
    SELECT 
        el.user_id,
        el.create_time
    FROM 
        event_logs el
    WHERE 
        el.event_id = 'onboarding_login_view' 
        AND el.referrer = 'plugin_installed'
),

first_usage_after_installed AS (
    SELECT
        i.user_id,
        i.create_time,
        COALESCE(min(cr.event_time), toDateTime('1970-01-01 00:00:00')) AS first_event_time
    FROM 
        install i
    LEFT JOIN 
        chat_records cr ON i.user_id = cr.user_id
    WHERE 
       cr.event_time > i.create_time
    GROUP BY 
        i.user_id, i.create_time
)

SELECT 
    i.user_id,
    i.create_time AS install_time,
    f.first_event_time AS first_usage_time
FROM 
    install i
LEFT JOIN 
    first_usage_after_installed f ON i.user_id = f.user_id AND i.create_time = f.create_time
```

This code first creates a temporary table `install` to store the user_id and create_time of users who installed the plugin. Then it creates another temporary table `first_usage_after_installed` to store the user_id, create_time and the time of the first event after installation. If there is no event after installation, the time will be set to '1970-01-01 00:00:00'. Finally, it selects the user_id, install_time and first_usage_time from these two tables. If a user has not used the plugin after installation, the first_usage_time will be '1970-01-01 00:00:00'.

Knowee AI · Accepted Answer

Here is the modified code:

```sql
WITH install AS (
    SELECT 
        el.user_id,
        el.create_time
    FROM 
        event_logs el
    WHERE 
        el.event_id = 'onboarding_login_view' 
        AND el.referrer = 'plugin_installed'
),

first_usage_after_installed AS (
    SELECT
        i.user_id,
        i.create_time,
        COALESCE(min(cr.event_time), toDateTime('1970-01-01 00:00:00')) AS first_event_time
    FROM 
        install i
    LEFT JOIN 
        chat_records cr ON i.user_id = cr.user_id
    WHERE 
       cr.event_time > i.create_time
    GROUP BY 
        i.user_id, i.create_time
)

SELECT 
    i.user_id,
    i.create_time AS install_time,
    f.first_event_time AS first_usage_time
FROM 
    install i
LEFT JOIN 
    first_usage_after_installed f ON i.user_id = f.user_id AND i.create_time = f.create_time
```

This code first creates a temporary table `install` to store the user_id and create_time of users who installed the plugin. Then it creates another temporary table `first_usage_after_installed` to store the user_id, create_time and the time of the first event after installation. If there is no event after installation, the time will be set to '1970-01-01 00:00:00'. Finally, it selects the user_id, install_time and first_usage_time from these two tables. If a user has not used the plugin after installation, the first_usage_time will be '1970-01-01 00:00:00'.

Question

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