PostgreSQL supports the DATE data type that stores the date values in YYYY-MM-DD format. Postgres utilizes 4 bytes of storage to store a date value. To store the current date as a default value, use the DEFAULT keyword and CURRENT_DATE function along with the DATE data type. This write-...
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...
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...
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(...
Date timestamp without zone timestamp Double numeric(p,s) big serial, double precision The precision and scale specified in ArcGIS can affect the resultant data type created in the database. See ArcGIS field data types for more information. Float numeric(p,s) The precision and sca...
Date only date Double numeric(p,s) double precision The precision (p) and scale (s) specified in ArcGIS can affect the resultant data type created in the database. SeeArcGIS field data typesfor more information. Float numeric(p,s)
information_schema.element_types v_cxf_attribute (15rows) 9.类型转换 在gp中,我们经常使用 cast函数,或者是::type进行类型转换,究竟哪两种类型之间是可以转换的,哪两种类型之间不能转换,转换的规则是什么。其实这些都在pg_cast里面中定义了。 我们想知道,text类型到date类型的转换是用了那个函数可以这么查: ...
DATE(Types.DATE), TIME(Types.TIME), TIMESTAMP(Types.TIMESTAMP), BINARY(Types.BINARY), VARBINARY(Types.VARBINARY), LONGVARBINARY(Types.LONGVARBINARY), NULL(Types.NULL), OTHER(Types.OTHER), BLOB(Types.BLOB), CLOB(Types.CLOB), BOOLEAN(Types.BOOLEAN), ...
SELECT current_date SELECT version() 是不是nothing happened,这是因为postgresql数据库要求必须使用;结尾否则不予执行,加上;之后就能看到结果了。 如果我们想创建数据库怎么办呢? 我们知道createdb和dropdb可以创建和删除数据库,但是如果我们这个时候执行出现什么问题呢?可以试一试,提示是个错误。
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 any time zone data. It means tha...