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. This enables several benefits: Consistency:A column can can store a single type of value. So, when you select a column with integer t...
Table 8.1 shows all the built-in general-purpose data types. Most of the alternative names listed in the “Aliases” column are the names used internally by PostgreSQL for historical reasons. In addition, some internally used or deprecated types are available, but are not listed here. 表8.1显...
Enumerated Types -https://www.postgresql.org/docs/10/static/datatype-enum.html 使用CREATE TYPE命令创建枚举类型 CREATETYPE moodASENUM ('sad','ok','happy');CREATETABLEperson ( name text, current_mood mood );INSERTINTOpersonVALUES('Moe','happy');SELECT*FROMpersonWHEREcurrent_mood='happy'; nam...
PostgreSQL provides two data types that are designed to support full text search, which is the activity of searching through a collection of natural-language documents to locate those that best match a query. The tsvector type represents a document in a form optimized for text search; the tsquer...
postgres=# \df List of functionsSchema | Name | Result data type | Argument data types | Type---+---+---+---
PostgreSQL data types supported in ArcGIS If the table contains a column with a data type not supported in ArcGIS, you can cast the column to text. However, only do this to see the values in the column; do not do this if you need to perform analysis that uses the values in that colu...
Geometry data types When you create a table or add a column to a table in a database, you define a specific data type for the column. Data types determine the following: What values you can store in the column What operations you can use on the data in that column How the data in...
几何类型(geometric types) point,二维平面上的点,用(x, y)表示,x、y分别表示x轴、y轴的坐标值 mydb=# create table test_point (name text, pt point); mydb=# INSERT INTO test_point (name, pt) VALUES ('p1', '(1.1,22.0)'); mydb=# INSERT INTO test_point (name, pt) VALUES ('p2'...
typedef struct nameData { char data[NAMEDATALEN]; } NameData; typedef NameData *Name; ,在物理文件的存储如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 postgres=# create table nametable(n1 name); CREATE TABLE postgres=# insert into nametable values ('liu'); INSERT 0 1 postgres...
Data types – cover the most commonly used PostgreSQL data types. Create a table –guide you on how to create a new table in the database. Select Into & Create table as–shows you how to create a new table from the result set of a query. Auto-increment column with SERIAL – use...