CREATE USER dbuser WITH PASSWORD 'password'; 第三件事是创建用户数据库,这里为exampledb,并指定所有者为dbuser。 CREATE DATABASE exampledb OWNER dbuser; 第四件事是将exampledb数据库的所有权限都赋予dbuser,否则dbuser只能登录控制台,没有任何数据库操作权限。 GRANT ALL PRIVILEGES ON DATABASE exampledb ...
Today, we are talking about a change in Postgres 16, that removes the alias requirement for subqueries in FROM. This may seem like a very obscure problem, but it's actually a very common issue for people that either migrate to Postgres, for example from Oracle to Postgres, or who are ne...
as newtable ('||rowc||' varchar,'||columnlist||')';stmt=E' select array_to_json(array_agg(row_to_json(t))) from ('||dynsql2||') t ';executestmtintoresult;returnresult;end$$ 测试用表结构和数据 -- toy example to show how it works create table table_to_pivot ( rowname varc...
CREATE TABLEcreates an empty table in the current database. The user who creates the table owns the table. If you provide a schema name, then the table is created in the specified schema. Otherwise it's created in the current schema. Temporary tables exist in a special schema...
--Create Users tableCREATE TABLE IF NOT EXISTS users( id bigserial NOT NULL, name character varying(100) NOT NULL,rating integer,PRIMARY KEY (id));CREATE INDEX usr_rating_idxON users USING btree(rating ASC NULLS LAST)TABLESPACE pg_default;--Create Stories tableCREATE TABLE IF NOT EXISTS...
create table tbl (id int, info text, crt_time timestamp); 1. 2、创建分区表,增加约束 do language plpgsql $$ declare parts int := 4; begin for i in 0..parts-1 loop execute format('create table tbl%s (like tbl including all) inherits (tbl)', i); ...
在上面的示例中,MyTable是表的类名,my_table是表的名称,id和name是表的列,Integer和String是列的数据类型。 创建表的方法: 代码语言:txt 复制 Base.metadata.create_all(engine) 这将根据定义的表结构在数据库中创建相应的表。 完整的示例代码如下: 代码语言:txt 复制 from sqlalchemy import create_engine, ...
CREATETABLEemployees ( employee_id SERIALPRIMARYKEY, emailVARCHAR(255) );INSERTINTOemployees (email)VALUES('john.doe@example.com'), ('jane.smith@company.org'), ('alice.johnson@domain.net');SELECTemail,LEFT(email,POSITION('@'INemail)-1)ASemail_prefixFROMemployees; ...
CREATETABLEuser_profiles ( user_id SERIALPRIMARYKEY, first_name TEXT, last_name TEXT, email TEXT );INSERTINTOuser_profiles (first_name, last_name, email)VALUES('John','Doe','john.doe@example.com'), ('Jane','Smith','jane.smith@example.com');SELECTCONCAT('Name: ', first_name,' ',...
create function assert_example(name text) returns uuid language plpgsql as $$ declare student_id uuid; begin -- 将用户ID保存到user_id变量中 select id into student_id from attendance_table where student = name; -- 如果student_id为null,则抛出错误 assert student_id is not null, 'assert_examp...