This section describes the data types supported by ClickHouse, for exampleintegers,floatsandstrings. System tablesystem.data_type_familiesprovides an overview of all available data types. It also shows whether a data type is an alias to another data type and its name is case-sensitive (e.g.boo...
日期类型,用两个字节存储,表示从 1970-01-01 (无符号) 到当前的日期值。 还有很多数据结构,可以参考官方文档:https://clickhouse.yandex/docs/zh/data_types/
Describe of IPv4 type:https://clickhouse.com/docs/en/sql-reference/data-types/domains/ipv4/ Describe of function for working with IPv4:https://clickhouse.com/docs/en/sql-reference/functions/ip-address-functions/ --deletefromwhereIP_address=IPv4StringToNum(...
The following table describes the mappings between data types in ClickHouse and Hologres. Category ClickHouse Hologres Date Date Date DateTime TIMESTAMPTZ DateTime(timezone) TIMESTAMPTZ DateTime64 TIMESTAMPTZ Numeric value Int8 Hologres does not support the single-byte INT data type, but uses the...
Contains information about supporteddata types. Columns: name(String) — Data type name. case_insensitive(UInt8) — Property that shows whether you can use a data type name in a query in case insensitive manner or not. For example,Dateanddateare both valid. ...
ClickHouse does not have a separate Boolean type. You can use UInt8 and Int8. Supported Array Partially supported. This data type is supported only if the elements in an array are of one of the following types: integer, floating point, string, or DateTime64 (accurate to milliseconds). ...
Not long ago, CH introduced new DateTime64 type. Despite this, it's not mentioned in ClickHouseDataType.java, so the corresponding java.sql.Types instance returned for DateTime64 is a very generic OTHER. It probably should return a more ...
ClickHouse can accept and return data in various formats. A format supported for input can be used to parse the data provided to INSERTs, to perform SELECTs from a file-backed table such as File, URL or HDFS, or to read a dictionary. A format supported for output can be used to arrang...
/strings/ [2] 哈希: https://redis.io/docs/data-types/hashes/ [3] 列表: https://redis.io/docs/data-types/lists.../ [4] 集合: https://redis.io/docs/data-types/sets/ [5]...
我们首先讨论ClickHouse代码中对Table的抽象,其父类接口定义在IStorage.h中.该父类负责以下功能: 1.table数据的存储 2.数据的查找和插入 3.数据的存储结构,如压缩方式 4.对数据的并发控制,如锁 我们可以从其定义的虚函数和数据成员.来总结其提供的基本功能: 1.查询表引擎的名字,表的名字,是否属于视图/是否支持...