The

variation_id

is an identifier used within GrowthBook to distinguish between different variations of an experiment. It is typically an integer that represents the position of a variation within an array of variations. For example, if you have an experiment with two variations, "control" and "treatment", they might be assigned

variation_id

values of

0

and

1

, respectively. This identifier is used in tracking and analyzing experiment data, as it allows you to determine which variation a user was exposed to during an experiment. The

variation_id

is included in the payload of experiment assignment queries and is expected to be returned as part of the data structure for tracking experiment exposure.

Here is an example of how the data might be structured in an experiment assignment query result:

| user_id | timestamp           | experiment_id   | variation_id |
|---------|---------------------|-----------------|--------------|
| 123     | 2021-08-23-10:53:04 | my-button-test  | 0            |
| 456     | 2021-08-23 10:53:06 | my-button-test  | 1            |

In this example,

user_id

123 saw variation

0

of the

my-button-test

experiment at the given timestamp, and

user_id

456 saw variation

1

at a different timestamp. For more details, you can refer to the Experiment Assignment Queries section in the GrowthBook documentation.

@fresh-football-47124 can you help explain this please?😅

the assignment query is just for reporting