In PostgreSQL, the INTERSECT operator combines the result set of at least two queries. The INTERSECT operator retrieves only common records from the targeted tables.
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How to Import a CSV File to a PostgreSQL Table
Importing CSV files into Postgres tables or exporting tables from PostgreSQL into CSV files are very common. In PostgreSQL, you can import a CSV file to a table using the \COPY statement(CLI) or pgAdmin(GUI).
In this write-up, we will learn various ways to import a CSV file to a Postgres table. So, let’s begin.
How to Use the \COPY Command in PostgreSQL?
You can use the \COPY statement to import …
Export a PostgreSQL Table to a CSV File
In PostgreSQL, there are multiple ways to export a table into a CSV file, such as the COPY statement or the \COPY command.
PostgreSQL UNNEST() Function With Examples
PostgreSQL provides a built-in function named UNNEST() that accepts an array as an argument and expands the given array into a set of rows.
PostgreSQL UNIQUE Constraint With Examples
Sometimes we have to store the unique records in a table, such as an email address, employee id, etc. To achieve this purpose, the “UNIQUE” constraint is used in PostgreSQL. The UNIQUE constraint allows us to store the unique rows/records in a table.
This post will explain the working of the UNIQUE constraint through practical examples. So, let’s begin.
How Does UNIQUE Constraint Work in PostgreSQL?
Each time when you …
PostgreSQL CAST Operator- How to Convert One Data Type to Another
PostgreSQL offers a CAST operator that takes an expression and a data type and converts the given expression into the specified data type.
PostgreSQL Drop if Exists VS Drop
The DROP command throws an error if a table to be dropped doesn’t exist while “DROP IF EXISTS” shows a notice instead of throwing an error.
PostgreSQL SELECT DISTINCT Clause With Examples
In Postgres, the SELECT DISTINCT clause fetches only unique values from a result set returned by a query. It retains only one row from a set of duplicated rows.
PostgreSQL COALESCE() Function With Examples
In PostgreSQL, the COALESCE() function handles the null values more efficiently. It accepts unlimited arguments and returns the first non-null argument.
PostgreSQL DATEADD() Equivalent- How to Add Interval to Datetime
PostgreSQL doesn’t provide a DATEADD function to add an interval to date time. However, you can achieve the same functionality using the “+” and “-” operators.
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