2020-04-03 13:23:32 +00:00
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---
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toc_folder_title: F.A.Q.
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2020-06-18 08:24:31 +00:00
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toc_hidden: true
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2020-04-03 13:23:32 +00:00
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toc_priority: 76
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---
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2020-06-22 13:39:48 +00:00
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# ClickHouse F.A.Q {#clickhouse-f-a-q}
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2020-06-22 13:35:41 +00:00
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This section of the documentation is a place to collect answers to ClickHouse-related questions that arise often.
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Categories:
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2020-06-24 12:59:19 +00:00
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- **[General](../faq/general/index.md)**
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- [What is ClickHouse?](../index.md#what-is-clickhouse)
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- [Why ClickHouse is so fast?](../faq/general/why-clickhouse-is-so-fast.md)
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- [Who is using ClickHouse?](../faq/general/who-is-using-clickhouse.md)
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- [What does “ClickHouse” mean?](../faq/general/dbms-naming.md)
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- [What does “Не тормозит” mean?](../faq/general/ne-tormozit.md)
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- [What is OLAP?](../faq/general/olap.md)
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- [What is a columnar database?](../faq/general/columnar-database.md)
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- [Why not use something like MapReduce?](../faq/general/mapreduce.md)
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- **[Use Cases](../faq/use-cases/index.md)**
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- [Can I use ClickHouse as a time-series database?](../faq/use-cases/time-series.md)
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- [Can I use ClickHouse as a key-value storage?](../faq/use-cases/key-value.md)
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- **[Operations](../faq/operations/index.md)**
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- [Which ClickHouse version to use in production?](../faq/operations/production.md)
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- [Is it possible to delete old records from a ClickHouse table?](../faq/operations/delete-old-data.md)
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- **[Integration](../faq/integration/index.md)**
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- [How do I export data from ClickHouse to a file?](../faq/integration/file-export.md)
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- [What if I have a problem with encodings when connecting to Oracle via ODBC?](../faq/integration/oracle-odbc.md)
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{## TODO
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Question candidates:
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- How to choose a primary key?
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- How to add a column in ClickHouse?
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- Too many parts
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- How to filter ClickHouse table by an array column contents?
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- How to insert all rows from one table to another of identical structure?
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- How to kill a process (query) in ClickHouse?
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- How to implement pivot (like in pandas)?
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- How to remove the default ClickHouse user through users.d?
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2021-05-27 19:49:41 +00:00
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- Importing MySQL dump to ClickHouse
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2020-10-13 17:23:29 +00:00
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- Window function workarounds (row_number, lag/lead, running diff/sum/average)
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2020-06-24 12:59:19 +00:00
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##}
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2020-06-22 13:35:41 +00:00
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2021-09-19 20:05:54 +00:00
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{## [Original article](https://clickhouse.com/docs/en/faq) ##}
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