How to SELECT data in ParadeDB PostgreSQL

How do I use the SELECT statement in ParadeDB?

SELECT retrieves specific rows and columns from ParadeDB tables, optionally filtering, sorting, joining, and aggregating results.

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Description

Example H2

Example H3

What is the SELECT statement in ParadeDB?

SELECT lets you read data from ParadeDB tables. You can list columns, filter rows, join tables, aggregate values, and limit or order the result set—all in one declarative command.

How do you write a basic SELECT?

Start with SELECT column_list FROM table_name;. Use * to return every column, but list only needed columns for performance and clarity.

How do you filter rows with WHERE?

Add WHERE conditions after FROM. ParadeDB pushes filters early, so precise predicates reduce scanned rows and save compute.

How can you join related tables?

Use INNER JOIN, LEFT JOIN, or other joins to combine tables on related keys. ParadeDB’s optimizer picks efficient join plans when keys are indexed.

How do you aggregate and group data?

Combine GROUP BY with aggregate functions such as COUNT(), SUM(), AVG(). Use HAVING to filter the aggregated result.

How do you sort and limit results?

ORDER BY sorts the output. LIMIT and OFFSET paginate results, ideal for API endpoints or UIs that load results incrementally.

What are best practices for SELECT?

Project only required columns, use explicit joins with clear aliases, filter early, index frequently-filtered columns, and avoid SELECT * in production queries.

When should you use DISTINCT?

Use DISTINCT to remove duplicates only when necessary; it forces an extra sort/aggregate step. Consider GROUP BY instead when also computing aggregates.

Why How to SELECT data in ParadeDB PostgreSQL is important

How to SELECT data in ParadeDB PostgreSQL Example Usage


-- Top 5 customers by lifetime spend
SELECT c.id, c.name, SUM(o.total_amount) AS lifetime_spend
FROM Customers c
JOIN Orders o ON o.customer_id = c.id
GROUP BY c.id, c.name
HAVING SUM(o.total_amount) > 1000
ORDER BY lifetime_spend DESC
LIMIT 5;

How to SELECT data in ParadeDB PostgreSQL Syntax


SELECT [DISTINCT] column1 [, column2 …]
       FROM table_name
       [JOIN type JOIN other_table ON join_condition]
       [WHERE condition]
       [GROUP BY column1, column2 …]
       [HAVING aggregate_condition]
       [ORDER BY column1 [ASC|DESC] …]
       [LIMIT count] [OFFSET skip];

-- E-commerce example
SELECT o.id, c.name, o.total_amount
FROM Orders o
JOIN Customers c ON c.id = o.customer_id
WHERE o.order_date >= CURRENT_DATE - INTERVAL '30 days'
ORDER BY o.total_amount DESC
LIMIT 20;

Common Mistakes

Using SELECT * in production. It fetches unnecessary columns, increases network traffic, and breaks apps when schemas change. Fix by listing only required columns.
Forgetting table aliases in multi-table queries, leading to ambiguous column errors. Always prefix columns with aliases (e.g., o.id, c.name) to stay explicit.