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Education

This is the Education section of the Command Prompt Website. Here you will find blogs specifically about how to use Postgres and related technologies.

How to Use DELETE Query in PostgreSQL

In PostgreSQL, the DELETE query can be used with or without the WHERE clause to delete a single, multiple, or all the rows of a specific table.

How to Use Update Query in PostgreSQL

In PostgreSQL, the UPDATE query is used with the assistance of the SET clause to update or modify the table’s record/data.

How to Use Select Query in PostgreSQL

The SELECT statement is used to fetch one or more columns of a table. It returns a resultant table which is known as the result set or result table.

How to Use Insert Query in PostgreSQL

In PostgreSQL, the “INSERT INTO” statement is used to add/insert an individual or multiple records into a specific table.

How to Use AND & OR Operators in PostgreSQL

In PostgreSQL, the AND and OR operators are used to combine more than one condition and are referred to as conjunctive, logical, or boolean operators.

How to Use WHERE Clause in PostgreSQL

In PostgreSQL, the WHERE clause is used to filter the results of different statements such as SELECT, DELETE, UPDATE, etc.

How to Rename the columns of a table in PostgreSQL

PostgreSQL provides a RENAME COLUMN clause that is used with the collaboration of ALTER TABLE command to rename a column.

How to Change/Modify Column Type in PostgreSQL

In PostgreSQL, the “ALTER TABLE” and “ALTER COLUMN” commands, along with the TYPE Keyword, are used to change/modify the data type of any specific column.

How to Drop Columns From a Table in PostgreSQL

In PostgreSQL, the DROP COLUMN command is used with the collaboration of the ALTER TABLE command to drop single or multiple columns.

How to Add Columns to a Table in PostgreSQL

In PostgreSQL, the ADD COLUMN command/statement along with the ALTER TABLE clause is used to add single or multiple columns to a table.