The PostgreSQLCREATE TABLEstatement is used to create a new table in a database. It defines the structure of the table, including column names, data types, and constraints. This tutorial covers how to use theCREATE TABLEstatement with practical examples. TheCREATE TABLEstatement is one of the ...
CREATE OR REPLACE FUNCTION "public"."f_inittables1"(arr _text)RETURNS "pg_catalog"."void" AS $BODY$DECLAREscount INTEGER;rownum integer := 1;currsnum text;strSQL text;BEGINscount:=array_length(arr,1);while rownum <= scount LOOPcurrsnum:=arr[rownum];RAISE NOTICE '这里是%', currsnum...
PostgreSQL 动态表复制(CREATE TABLE AS&CREATE TABLE LIKE) 前言 项目中有表复制的需求,而且是动态复制,即在存储过程里根据参数数组的值循环复制n张结构(约束、索引等)等一致的一组表,PostgreSQL提供了两种语法来进行表复制,分别是:CREATE TABLE AS、CREATE TABLE LIKE。 下面就通过一个例子来看看究竟哪一种更好或...
v_constraint_comment_record record;BEGIN-- grab the oid of the table; https://www.postgresql.org/docs/8.3/catalog-pg-class.htmlSELECTc.oid, c.relkindINTOv_table_oid, v_table_typeFROMpg_catalog.pg_class cLEFTJOINpg_catalog.pg_namespace nONn.oid=c.relnamespaceWHEREc.relkindin('r','p...
PostgreSQL: 63 characters Create Table Primary Key Syntax You can specify a primary key on a table when you create in two ways: Next to the column data type when you declare it on the same line (an inline constraint) At the end of all column declarations (an out of line constraint) ...
This document discusses how to create table in PostgreSQL using command line, pgAdmin III and phpPgAdmin. For ease of understanding, each process is complemented by screenshots taken while doing.
来自专栏 · PostgreSQL 命令 CREATE TABLE CREATE TABLE — 定义一个新表 大纲 CREATE [ [ GLOBAL | LOCAL ] { TEMPORARY | TEMP } | UNLOGGED ] TABLE [ IF NOT EXISTS ] table_name ( [ { column_name data_type [ COLLATE collation ] [ column_constraint [ ... ] ] | table_constraint | LIK...
This tutorial works for PostgreSQL anywhere. If you need cloud Postgres, get the generous free plan on Neon. Summary: in this tutorial, you will learn how to use the PostgreSQL CREATE TABLE statement to create a new table. Introduction to PostgreSQL CREATE TABLE statement Typically, a relational...
PostgreSQL 自动为每个唯一约束和主键约束创建一个索引以确保其唯一性。因此,不必为主键字段明确的创建索引。参阅CREATE INDEX获取更多信息。 唯一约束和主键在目前的实现里是不能继承的。如果把继承和唯一约束组合在一起会导致无法运转。 一个表不能超过 1600 个字段。实际的限制比这个更低,因为还有元组长度限制。
当一个类型化的表被创建时,列的数据类型由底层的组合类型决定而没有在CREATE TABLE命令中直接指定。但是CREATE TABLE命令可以对表增加默认值和约束,并且可以指定存储参数。 column_name列的名称会在新表中被建立. data_type列的数据类型. 这可以包括数组规格。 COLLATE collation COLLATE子句为该列(必须是一种可排序...