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Update settings.md
Убрал лишние символы в заголовке настройки allow_nullable_key.
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{"number":"1"}
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{"number":"2"}
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## allow_nullable_key {#allow-nullable-key}
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Allows using of the [Nullable](../../sql-reference/data-types/nullable.md#data_type-nullable)-typed values in a sorting and a primary key for [MergeTree](../../engines/table-engines/mergetree-family/mergetree.md#table_engines-mergetree) tables.
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