Replaceingmergetree: to update Clickhouse data
Absrtact: as an OLAP database, Clickhouse has very limited support for transactions. This paper mainly introduces how to update and delete Clickhouse data through replacing mergetree.
This article is shared from Huawei cloud community< How to update data in Clickhouse >, author: bully.
As an OLAP database, Clickhouse has very limited supp ...
Posted on Thu, 04 Nov 2021 03:53:52 -0400 by geoffism
SQL function of ClickHouse and Update and Delete operations
1.SQL function
1.1 type detection function
toTypeName
select toTypeName(0); -- UInt8
select toTypeName(-0); -- UInt8
select toTypeName(1000); -- UInt16
select toTypeName(-1000); -- Int16
select toTypeName(10000000); -- UInt32
select toTypeName(-10000000); -- Int32
select toTypeName(1.99); -- Float64
select toTypeName(toFloat32(1.99)); ...
Posted on Fri, 08 Oct 2021 23:21:43 -0400 by mattcairns
3, Install Clickhouse (stand-alone & cluster) in docker
1, Install docker
https://blog.csdn.net/weixin_39912640/article/details/120391027
2, Install zookeeper cluster
The Clickhouse stand-alone does not use the zookeeper cluster. In the cluster mode, the inverted zookeeper cluster is required, but the zookeeper cluster is not necessarily required.
https://blog.csdn.net/weixin_39912640/article/d ...
Posted on Tue, 21 Sep 2021 00:13:05 -0400 by Ixplodestuff8