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How to install MongoDB in Ubuntu 20.04

MongoDB is a free open source database of documents. It belongs to a family of databases called NoSQL, which is different from traditional table-based…

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PostgreSQL change user password

The ALTER USER operator is used to change the user password in a PostgreSQL database….

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PostgreSQL CREATE USER statement

PostgreSQL CREATE USER statement creates a database account, which allows you to log in to a PostgreSQL database…

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PostgreSQL Join

PostgreSQL JOIN is used to extract data from multiple tables. PostgreSQL JOIN is executed whenever two or more tables are combined in an SQL statement…

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PostgreSQL EXCEPT statement

The PostgreSQL EXCEPT statement is used to return all lines in the first SELECT statement that are not returned by the second SELECT statement.

Each…

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