Next-Day Account Verification

SQL practice question · Easy · Date & Time · TikTok

registrations has one row per signup email (email_id, user_id, signup_date) and verification_actions has one row per verification attempt (email_id, action_date, signup_action) where signup_action is 'Confirmed' or 'Not confirmed'; an email can have several attempts. Return the users who confirmed exactly on the calendar day after their signup date (a 'Confirmed' attempt dated signup_date + 1 day). Each user appears once. Output column: user_id. Order by user_id ascending.

Table: registrations

Schema of registrations
ColumnType
email_idINTEGER
user_idINTEGER
signup_dateDATE
Sample rows of registrations
email_iduser_idsignup_date
1102026-01-01
2202026-01-01
3302026-01-03

Table: verification_actions

Schema of verification_actions
ColumnType
email_idINTEGER
action_dateDATE
signup_actionTEXT
Sample rows of verification_actions
email_idaction_datesignup_action
12026-01-02Confirmed
22026-01-03Confirmed
32026-01-04Not confirmed
Expected output on the sample data
user_id
10

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