Postgresql中的dataType 1.整数类型 smallint(int2) 2bytes integer(int,int4) 4bytes bigint(int8) 8bytes 2.任意精度数值 numeric(precision,scale),用于精确的货币和科学计算。 eg:23.5141,precision=6,scale-4 如果指定,precision最大值为1000,如果numeric中没有指定precious,小数点前最多有131072个数字,小数...
PostgreSQL provides aDATEdata type that allows us to store the date values in YYYY-MM-DD format. TheDATEdata type takes 4 bytes to store a date value in the storage. TheDATEdata type stores a date between 4713 BC to 5874897 AD. This write will help you to understand how to use theDA...
不精确型:read、double precision https://www.postgresql.org/docs/14/datatype-numeric.html 为什么说不精确呢?因为数据类型成功插入后,查询出来值可能和你插入的值不一样,原因是长度截断和四舍五入。 精确类型不会发生截断且如果超长了直接报错,主要插入成功了,查出来的一定等于插入的结果。 看下具体例子: real...
PostgreSQL provides two JSON data types: JSON and JSONB for storing JSON data. The JSON data type stores plain JSON data that requires reparsing for each processing, while JSONB data type stores JSON data in a binary format which is faster to process but slower to insert. In addition, JSO...
This document discusses PostgreSQL Data Types. While creating table, for each column, you specify a data type, i.e. what kind of data you want to store.
PostgreSQL Data Types PostgreSQL has a rich set of native data types available to users. Users can add new types to PostgreSQL using the CREATE TYPE command. PostgreSQL有一组丰富的本地数据类型可供用户使用。用户可以使用CREATE TYPE命令向PostgreSQL添加新类型。Each data type has an external representat...
Postgresql:内置数据类型(data type) sql standard sqlserver postgresql postgresqlaliases description bigint bigint bigint int8 signed eight-byte integer:有符号8字节整数 bigserial serial8 autoincrementing eight-byte integer:自增属性的 bigint bit binary bit [ (n) ] fixed-length ...
Change Column's Data Type Rename Column Drop Table Temporary Table Truncate Table Database Constraints Primary Key Foreign Key CHECK Constraint UNIQUE Constraint NOT NULL Constraint DEFAULT Constraint PostgreSQL Data Types Boolean CHAR, VARCHAR, and TEXT ...
问PostgreSQL语言中的data_type和UDT_nameEN这题粗看复杂，其实不然。首先不难看出，abo、an并不是数字...
"char" – A single-byte internal type (where the data type named char is enclosed in quotation marks). name – An internal type for object names. For more information about these types, seeSpecial Character Typesin the PostgreSQL documentation. ...