Update mergetree.md

Use `explicitly` instead of `obviously`
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Igor Nikonov 2022-06-21 20:39:59 +02:00 committed by GitHub
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@ -66,7 +66,7 @@ For a description of parameters, see the [CREATE query description](../../../sql
A tuple of column names or arbitrary expressions. Example: `ORDER BY (CounterID, EventDate)`.
ClickHouse uses the sorting key as a primary key if the primary key is not defined obviously by the `PRIMARY KEY` clause.
ClickHouse uses the sorting key as a primary key if the primary key is not defined explicitly by the `PRIMARY KEY` clause.
Use the `ORDER BY tuple()` syntax, if you do not need sorting. See [Selecting the Primary Key](#selecting-the-primary-key).