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RETENTION

Aggregate function

The RETENTION() function takes as arguments a set of conditions from 1 to 32 arguments of type UInt8 that indicate whether a certain condition was met for the event.

Any condition can be specified as an argument (as in WHERE).

The conditions, except the first, apply in pairs: the result of the second will be true if the first and second are true, of the third if the first and third are true, etc.

Syntax

RETENTION( <cond1> , <cond2> , ..., <cond32> );

Arguments

ArgumentsDescription
<cond>An expression that returns a Boolean result

Return Type

The array of 1 or 0.

Example

Create a Table and Insert Sample Data

CREATE TABLE user_events (
id INT,
user_id INT,
event_date DATE,
event_type VARCHAR
);

INSERT INTO user_events (id, user_id, event_date, event_type)
VALUES (1, 1, '2022-01-01', 'signup'),
(2, 1, '2022-01-02', 'login'),
(3, 2, '2022-01-01', 'signup'),
(4, 2, '2022-01-03', 'purchase'),
(5, 3, '2022-01-01', 'signup'),
(6, 3, '2022-01-02', 'login');

Query Demo: Calculate User Retention Based on Signup, Login, and Purchase Events

SELECT
user_id,
RETENTION(event_type = 'signup', event_type = 'login', event_type = 'purchase') AS retention
FROM user_events
GROUP BY user_id;

Result

| user_id | retention |
|---------|-----------|
| 1 | [1, 1, 0] |
| 2 | [1, 0, 1] |
| 3 | [1, 1, 0] |
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