ISNULL in PostgreSQL - Examples & AI Generator

Working with ISNULL across SQL databases can be confusing, especially in PostgreSQL where the typical ISNULL function isn't supported as in SQL Server. PostgreSQL uses COALESCE and NULLIF for similar null-handling. Remembering the right syntax can slow your workflow. With AI2sql, you can generate PostgreSQL ISNULL queries from natural language prompts—no coding, just results in 10 seconds. Save time and reduce errors, whether you're switching databases or learning new SQL functions.

ISNULL Syntax in PostgreSQL

Standard PostgreSQL Alternatives

• COALESCE(expr1, expr2): Returns the first non-null value.

• NULLIF(expr1, expr2): Returns NULL if expressions are equal, otherwise returns expr1.

PostgreSQL does not have an ISNULL() function natively. Here’s how to achieve the same logic:

-- Equivalent to ISNULL(col, value) in SQL Server
COALESCE(col, value)

ISNULL Examples You Can Generate Instantly

Real-world scenarios for ISNULL PostgreSQL examples:

• Customer Phone Default: Return a placeholder if a customer phone is missing.

• Total Order Amount: Show 0 when total_amount is NULL.

• Product Description Fallback: Use 'No description' if none is set.

-- Example 1: Show 'N/A' if customer phone is null
SELECT name, COALESCE(phone, 'N/A') AS phone FROM customers;

-- Example 2: Replace null total_amount with 0 in orders
SELECT order_id, COALESCE(total_amount, 0) AS total_amount FROM orders;

-- Example 3: Fill missing product descriptions
SELECT product_id, COALESCE(description, 'No description') AS description FROM products;

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Why Use AI2sql Instead of Manual ISNULL Coding

• 10-second generation: Skip syntax checks. Get queries fast.

• No coding required: Works from plain English prompts.

• PostgreSQL accuracy: Generates valid ISNULL alternatives (like COALESCE) instantly.

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FAQ: ISNULL in PostgreSQL

• Does PostgreSQL support ISNULL?
  No, use COALESCE() for similar functionality.

• Can I replace NULLs with any value?
  Yes—COALESCE(column, value) returns your chosen value when the column is NULL.

• What is the difference between ISNULL and COALESCE?
  ISNULL is from SQL Server. COALESCE is the standard and what PostgreSQL uses.

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