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Merge pull request #116 from Altinity/sphoortific-patch-1
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Update pick-keys.md
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DougTidwell authored Dec 5, 2024
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7 changes: 5 additions & 2 deletions content/en/engines/mergetree-table-engine-family/pick-keys.md
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---
title: "How to pick an ORDER BY / PRIMARY KEY / PARTITION BY for the MergeTree family table"
linkTitle: "Proper ordering and partitioning the MergeTree tables"
linkTitle: "Proper ordering and partitioning MergeTree tables"
keywords:
- order by clickhouse
- clickhouse partition by
weight: 100
description: >-
How to pick an ORDER BY / PRIMARY KEY / PARTITION BY for the MergeTree table.
How to pick an ORDER BY / PRIMARY KEY / PARTITION BY for MergeTree tables.
---

Good `order by` usually have 3 to 5 columns, from lowest cardinal on the left (and the most important for filtering) to highest cardinal (and less important for filtering).
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