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...
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 ...
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...
Extra configuration parameter for gtm_proxy. Coordinator section has an example.gtmPxySpecificExtraConfig=(none none none none)#--- Coordinators ---#--- shortcuts ---coordMasterDir=$HOME/pgxc/nodes/coord coordSlaveDir=$HOME/pgxc/nodes/coord_slave coordArchLogDir=$HOME/pgxc/nodes/coord_archlog...
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; ...
-- toy example to show how it works create table table_to_pivot ( rowname varchar, colname varchar, cellval numeric ); insert into table_to_pivot values ('row1','col1',11); insert into table_to_pivot values ('row1','col2',12); ...
--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 $$ declare parts int := 4; begin for i in 0..parts-1 loop execute format('create table tbl%s (like tbl including all) inherits (tbl)', i); ...
create function assert_example(name text) returns uuid language plpgsql as $$ 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...
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,' ',...