# Symmetric Aggregates

Symmetric aggregates allow Zenlytic to calculate your metrics accurately even when there's a situation where the joins make that very difficult by duplicating the values to aggregate.

We could go in-depth into how we do this, but we're obviously not the first to do this, and Looker has already written the best piece of content about this here, which we strongly recommend checking out.

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ExamplesYou can use `distinct`

aggregates to tell Zenlytic how to distinctly calculate your metric. For example, this measure is a sum, but uniquely for each `order_id`

.

`- name: total_price_order_level field_type: measure type: sum_distinct sql_distinct_key: ${order_id} sql: ${price} `