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LIMIT - (PostgreSQL Clause)

The LIMIT clause in PostgreSQL is used to limit the number of rows returned by a query. In this tutorial, we'll discuss the syntax, example, output, explanation, use, important points, and summary of the LIMIT clause in PostgreSQL.

Syntax

SELECT column1, column2, ...
FROM table_name
LIMIT number;
  • SELECT column1, column2, ...: The columns to select from the table. You can select all columns by using SELECT *.
  • FROM table_name: The table to select data from.
  • LIMIT number: The number of rows to limit the result set.

Example

Let's use the LIMIT clause to select a limited number of rows from a table.

SELECT first_name, last_name
FROM employees
LIMIT 5;

The output of this query would be the first 5 rows of the employees table, only including the first_name and last_name columns.

Explanation

In this example, we used the LIMIT clause to limit the number of rows returned by the query to 5. This can be useful in situations where you only need a subset of the rows in a large table.

Use

The LIMIT clause is often used in conjunction with the ORDER BY clause to limit the top or bottom n rows of a result set based on a specific column.

Important Points

  • The LIMIT clause must come at the end of the query.
  • The LIMIT clause only works with the SELECT statement.
  • If you want to return a different subset of rows, you can adjust the number in the LIMIT clause accordingly.
  • The LIMIT clause can lead to increased performance when querying large tables.

Summary

In this tutorial, we discussed the LIMIT clause in PostgreSQL. We covered the syntax, example, output, explanation, use, and important points of the LIMIT clause. With this knowledge, you can now use the LIMIT clause in your PostgreSQL queries to limit the number of rows returned by a query.

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