b int) DISTRIBUTE BY HASH(b); CREATE TABLE postgres=# CREATE TABLE nsp_1.t1(a int, b int) DISTRIBUTE BY HASH(b); ERROR: relation "t1" already exists postgres=# CREATE TABLE nsp_2.t1(a int, b int) DISTRIBUTE BY HASH(b); CREATE...
In Databases like MySQL, you can use the“IF NOT EXISTS”option with theCREATE DATABASEcommand to create a database only if it doesn’t exist already. However, PostgreSQL doesn’t support the“IF NOT EXISTS”option for theCREATE DATABASEstatement. But thankfully Postgres supports an alternative...
createdb -U postgres ${DB_NAME} echo "Database ${DB_NAME} created." else echo "Database ${DB_NAME} already exists." fi Explanation 1. Query Execution: The psql command-line tool queries the system catalog. 2. Shell Script Logic: ...
@文心快码postgres create database if not exists 文心快码 在PostgreSQL 中,虽然没有直接的 CREATE DATABASE IF NOT EXISTS 语法,但我们可以通过编写脚本来模拟这一功能。以下是基于你提供的 tips 的详细步骤和代码示例: 检查数据库是否存在: 我们可以通过查询系统目录 pg_database 来检查数据库是否存在。 sql ...
psql -U postgres Second, execute the CREATE DATABASE statement to a new database with default parameters: CREATE DATABASE sales; Output: CREATE DATABASE PostgreSQL will create a new database called sales that has default parameters from the default template database (template1). Third, show all...
postgres=#CREATESCHEMAnsp_1;CREATESCHEMApostgres=#CREATESCHEMAnsp_2;CREATESCHEMApostgres=#CREATETABLEnsp_1.t1(a int,b int)DISTRIBUTEBYHASH(b);CREATETABLEpostgres=#CREATETABLEnsp_1.t1(a int,b int)DISTRIBUTEBYHASH(b);ERROR:relation"t1"already exists ...
A Postgres database can be created using “CREATE DATABASE” or “createdb” commands. The difference is that the “createdb” can be executed from the command promp…
A sequence in Postgres is a schema-bound object that generates a series of integers according to the given specifications. Asequence can be createdin Postgres by executing a CREATE statement followed by a “SEQUENCE” keyword. CREATE SEQUENCE [ IF NOT EXISTS ] name_of_sequence ...
are nulls and see that the query will never provide the desired results. But if you use the subquery version, it is not so easy to see. More importantly, even if the subquery result is guaranteed to have no nulls, Postgres won’t optimize it into an anti join. Use NOT EXISTS inste...
I'm stuck on create an Odoo instal with docker-compose. The database already exist when clicking on "Create database". I use the default docker-compose.yml Impacted versions: odoo:12.0 postgres:1 Steps to reproduce: Up the default docker-compose file: ` version: '2' services: web: image...