Table API中的数据类型 Java/Scala 在基于JVM的API中,用户在Table API中使用org.apache.flink.table.types.DataType的实例,或者在定义连接器、目录或用户定义函数时使用。 DataType实例有两个职责: 声明一个逻辑类型,它不会暗示传输或存储的具体物理表示,但定义了基于JVM/Python语言和表生态系统
The syntax for SQL Data Types is: CREATETABLEtable_name ( column1_name datatype1, column2_name datatype2, column3_name datatype3, ... ); Here, column1_name,column2_name,column3_name,...are the names of the columns datatype1,datatype2,datatype3,...are the data types such asINT...
Example : A table using numeric data types-- Creating a new table named "test" in the current schema CREATE TABLE test ( -- Defining a column named "id" of the DECIMAL data type, designated as the PRIMARY KEY id DECIMAL PRIMARY KEY, -- Defining a column named "name" of the VARCHAR...
A wide range of data types are supported and can be used to declare variables in a PL/SQL block. Table 1. Supported scalar data types that are available in PL/SQL PL/SQL data typeDb2® SQL data typeDescription BINARY_INTEGER INTEGER Integer numeric data BLOB BLOB (4096) Binary data ...
The data type of a column defines what value the column can hold: integer, character, money, date and time, binary, and so on. SQL Data Types Each column in a database table is required to have a name and a data type. An SQL developer must decide what type of data that will be ...
8、Other Data Types 1)BOOLEAN 2)、RAW 3)、NULL 三、类型转换 1、CAST 方法 2、旧版本 CAST 方法 四、数据类型提取 本文基于flink1.17版本,介绍了flink的数据类型的全部内容,包含数据类型定义、自定义数据类型、类型转换与提取。 本文全部是说明性的,为后续的table api和sql使用奠定基础。
基础类型,Flink 可以通过反射类型信息自动把数据类型获取到 // 关于 SQL 类型和 Java 类型之间的映射见:https://nightlies.apache.org/flink/flink-docs-release-1.13/docs/dev/table/types/#data-type-extraction public int age; public String name; // 2. 复杂类型,用户可以通过 @DataTypeHint("DECIMAL(10...
Table 3-1 Data Types with Different Maximum Sizes in PL/SQL and SQL Data TypeMaximum Size in PL/SQLMaximum Size in SQL CHARFoot 1 32,767 bytes 2,000 bytes NCHARFootref 1 32,767 bytes 2,000 bytes RAWFootref 1 32,767 bytes 2,000 bytesFoot 2 ...
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CREATE DATABASE CREATE FUNCTION (SQL) CREATE FUNCTION (外部) 創建地點 CREATE MATERIALIZED VIEW CREATE RECIPIENT CREATE SCHEMA CREATE SERVER CREATE SHARE CREATE STREAMING TABLE CREATE TABLE 數據表屬性和數據表選項 CREATE TABLE 使用 Hive 格式 CREATE TABLE CONSTRAINT CREATE TABLE 使用中 CREATE TABLE LIKE ...