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(...
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...
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...
Category - Binary Data TypesNameDescriptionStorage Size bytea variable-length binary string 1 or 4 bytes plus the actual binary stringCategory - Date/Time TypesNameDescriptionStorage Size Low Value High Value Resolution timestamp [ (p) ] [ without time zone ] both date and time (no time ...
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...
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(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), ...
理解数据类型:首先,需要了解要更改的数据类型及其特性。在PostgreSQL中,常见的数据类型包括整数(integer)、浮点数(float)、字符(character)、日期/时间(date/time)等。 修改表结构:要更改数据类型的默认查询,需要修改相关表的结构。可以使用ALTER TABLE语句来修改表的列定义。例如,如果要将某个列的数据类型从整数更改为...
TO_TIMESTAMP(CAST(date AS VARCHAR), 'YYYY-MM-DD') AS timestamp_column 这个例子中,假设您的date字段是一个date类型,将其先转换为VARCHAR字符串,然后使用TO_TIMESTAMP函数指定日期格式将其转换为TIMESTAMP类型。 修改PostgreSQL 驱动程序的配置:有时,PostgreSQL 驱动程序对于某些数据类型的默认映射可能会导致转换...
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。