postgres=#updatedepartmentssetdepartment_id=50wheredepartment_name='IT';UPDATE1postgres=#select*fromdepartments ;department_id | department_name | manager_id | location_id---+---+---+---70 | Public Relations | 100 | 1700 50 | IT | 100 | 1100 (2 rows) Example 2...
Example: How to update data types of several columns using a single command in PostgreSQL? From the snippet shown in step 4 of the previous example, we can observe that the“team_rating”and“team_lead”columns have a “character” data type. Suppose we have to change both columns' data ...
In PostgreSQL, a superuser has unrestricted access to all database functions, including administrative tasks and user management. If you need to grant a specific user superuser privileges, you can do so with the ALTER USER command. However, only an existing superuser can promote another user to...
To install PostgreSQL version 12, you must enable that version’s module stream. When you enable a module stream, you override the default stream and make all of the packages related to the enabled stream available on the system. Note that only one stream of any given module can be enabled...
PG cannot execute UPDATE in a read-only transaction | How to add column if not exists on PostgreSQL PG cannot execute UPDATE in a read-only transaction出现这种情况时,说明SQL语句可能是运行在一个PG集群中的非master节点上。查看data/pg_hba.conf。
How to debug plpgsql with pgAdminIII [root@localhost soft_bak]# git clone git://git.postgresql.org/git/pldebugger.git Initialized empty Git repository in /opt/soft_bak/pldebugger/.git/ remote: Counting objects: 445, done. remote: Compressing objects: 100% (341/341), done. ...
Step 1 — Update Base Systems Since this is a fresh install of Ubuntu Server 20.04, before we install PostgreSQL 9.6, let’s update our system to the latest update. sudo apt-get updatesudo apt-get -y upgrade After we upgrade our base system, now it’s time to install PostgreSQL 9.6. ...
Step 1 — Installing PostgreSQL Ubuntu’s default repositories contain Postgres packages, so you can install these using theaptpackaging system. If you’ve not done so recently, refresh your server’s local package index: sudoaptupdate Copy ...
To rename a database in PostgreSQL, specify anALTER DATABASEcommand, followed by the database's old name, after that specify theRENAME TOclause followed by the database's new name: ALTER DATABASE old_dbname RENAME TO new_dbname; Let’s implement it practically. ...
1.4. If you have installed PostgreSQL published by EDB, you need to uninstall it by the uninstaller. cd /opt/PostgreSQL/10 Depends on the version you installed, the above "10" may be different ("10" is the version number of PostgreSQL I installed). 1.5. Find the uninstaller ls sudo ....