Introduction While performing database integration tests, things went south, and I ended up with more than 15 (fifteen) temporary PostgreSQL test databases. I use OmniDB, an open-source application for managing databases. Version (3.0.2b) of OmniDB does not have an option for selecting and dropping multiple databases. To drop a database in OmniDB, you right-click on a database, select Drop Database from the context menu, run the query to drop the database, and finally close the query window.
Introduction Extensible Markup Language (XML) has been in existence for more than two decades. XML is a markup language for encoding documents in a format that is both human and machine readable. In XML, you define your own custom tags, elements and attributes to meet your specific needs. XML is case sensitive, allows comments and hierarchy is important. An XML file is a text file and can be opened with any text editor.
Introduction Parrot OS is a light Linux distribution based on Debian. Microsoft SQL Server or SQL Server is a relational database management system (RDBMS) developed by Microsoft. Starting with SQL Server 2017, Microsoft added Linux support and thus making any newer versions cross platform. This post steps through the process of SQL Server 2019 Developer edition installation on Parrot OS and contains the following topics: downloading and configuring MS SQL Server 2019 package repository running the SQL Server setup process installation of SQL Server command line tools installation Azure Data Studio running queries in Azure Data Studio The commands used in this post will also work on any Debian based distribution like Ubuntu, MX Linux, Linux Mint, Knoppix among many others.
PostgreSQL Connection Failure Sometimes, computers have a life of their own. You shut down your laptop and on the next boot, you are unable to connect to a PostgreSQL 12 database. Opening the installed Postgres.app, I notice it displays stale postmaster.pid file error. Postmaster.pid What the heck is the postmaster.pid file? Turns out that the postmaster.pid is a lock file used to prevent two instances of the same PostgreSQL server from running on the same data-directory.
In PostgreSQL, assume you have a table and view with the following definitions: CREATE TABLE boq_items ( id character varying(22) NOT NULL, item_no character varying(50) NOT NULL, activity_name character varying(255) NOT NULL, page_no int NOT NULL, qty numeric(14,2) NOT NULL, rate numeric(14,2) NOT NULL, bq_amt numeric(14,2) NOT NULL ); CREATE VIEW vw_boq_item_names AS SELECT activity_name FROM boq_items; Attempting to change the definition of activity_name column using ALTER TABLE boq_items ALTER activity_name TYPE text, ALTER activity_name SET NOT NULL; will return a cannot alter type of a column used by a view or rule.
Introduction The DROP TABLE command in PostgreSQL removes a table definition, all data and indexes of a table from a database. DROP TABLE will fail if the table has other objects that depend on it like views and foreign key definitions. The command will also fail and display a table does not exist message if the table being dropped does not exist. PostgreSQL does not have a drop all tables command and you have to define your own way of performing this task.
When upgrading from MS SQL Server 2008 to MS SQL Server 2012, I decided to retain the data directories I was using in SQL 2008. I therefore did a backup and detached all my private databases, removed SQL 2008 and did a clean install of MS SQL 2012. I logged into the new server and on trying to attach back any of my databases, I encountered the following error: CREATE FILE encountered operating system error 5 (Access is denied) while attempting to open or create the physical file .