Each data type has an external representation determined by its input and output functions. Many of the built-in types have obvious external formats. However, several types are either unique to PostgreSQL, such as geometric paths, or have several possible formats, such as the date and time type...
Date/time types E Enum types G Geometric types I Network address types N Numeric types P Pseudo-types R Range types S String types T Timespan types U User-defined types V Bit-string types X unknown type typispreferred:这个字段和 typcategory是一起工作的,表示是否在 typcategory分类中首选的。
date 日期(没有时间) 4字节 4713 bc 5874897 ad time [ (p) ] [ 不带时区 ] 时间(无日期) 8字节 00:00:00 24:00:00 time [ (p) ] 带时区 仅限时间,带时区 12字节 00:00:00+1459 24:00:00-1459 interval [ fields ] [ (p) ] 时间间隔 12字节 -178000000年 178000000年 4.其他数据类型...
PostgreSQL Data TypesOverview of PostgreSQL data types PostgreSQL supports the following data types: Boolean Character types such as char, varchar, and text. Numeric types such as integer and floating-point number. Temporal types such as date, time, timestamp, and interval UUID for storing Universa...
Category - Binary Data Types Category - Date/Time Types Category - Boolean Type Category - Enumerated Type Unlike other types, Enumerated Types need to be created using CREATE TYPE command. This type is used to store a static, ordered set of values, for example compass directions,i.e. NORTH...
Introduction to PostgreSQL timestamp PostgreSQL provides you with two temporal data types for handling timestamps: timestamp: a timestamp without a timezone one. timestamptz: timestamp with a timezone. The timestamp datatype allows you to store both date and time. However, it does not have...
PostgreSQL provides several data types for the DateTime values, such as TIME, DATE, INTERVAL, TIMESTAMP, and TIMESTAMPTZ. These data types allow us to store the DateTime values in a database. The time data type stores time values in the database, the date data type stores the date values...
from sqlalchemy import create_engine, Column, Integer, String, Float, Boolean, DECIMAL, Enum, Date, DateTime, Time, Text from sqlalchemy.dialects.mysql import LONGTEXT 1. 2. 3. 2.create_engine(): AI检测代码解析 from sqlalchemy import create_engine engine = create_engine("mysql+pymysql:...
一般数据类型包括数值型,货币类型,字符类型,日期类型,布尔类型,枚举类型等,非常规数据类型包括二进制数据类型,几何类型,网络地址类型,位串类型,文本搜索类型,UUID类型,XML类型,JSON类型,数组类型,复合类型,范围类型,Domain类型,OID类型,pg_lsn类型和pseudo-Types类型。
整数类型(integer types) 任意精度类型(arbitrary precision numbers) 浮点数类型(floating-point types) 序列类型(serial types) 金额类型(monetary types) 字符类型(character types) 二进制数据类型(binary data types) 日期/时间类型(date/time types) 布尔类型(boolean type) 枚举类型(enumerated types) 几何类型(...