NULL in SQL Server - Examples & AI Generator

Dealing with NULL values is a core part of SQL Server—but handling them can be tricky. From unexpected query results to complex conditional logic, mismanaging NULL often leads to bugs. If you’re tired of memorizing SQL Server NULL syntax or switching contexts between databases, AI2sql offers a no-coding, instant solution. In seconds, translate natural language into production-ready NULL queries—no manual lookup or trial and error required.

NULL Syntax in SQL Server

• Detect NULL: IS NULL, IS NOT NULL

• Replace NULL: ISNULL(expression, replacement)

• NULL-safe comparisons: Use IS/IS NOT instead of =/!=

Basic Examples

• Filter out NULL customers: SELECT * FROM Customers WHERE PhoneNumber IS NOT NULL

• Show orders missing a shipping date: SELECT OrderID FROM Orders WHERE ShippedDate IS NULL

• Fill missing product descriptions: SELECT ISNULL(Description, 'No description') AS ProductDescription FROM Products

NULL Examples You Can Generate Instantly

Practical Business Scenarios

-- Find all customers without email addresses
SELECT CustomerID, Name FROM Customers WHERE Email IS NULL;

-- Retrieve orders where payment date is missing
SELECT OrderID, Total FROM Orders WHERE PaymentDate IS NULL;

-- Replace missing manager names with 'Unassigned'
SELECT ISNULL(Manager, 'Unassigned') AS ManagerName, Department FROM Departments;

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FAQ: NULL in SQL Server

• Q: What's the difference between = NULL and IS NULL?
  A: Use IS NULL in SQL Server; = NULL always returns false due to SQL's three-valued logic.

• Q: How do I replace NULL values in a query?
  A: Use the ISNULL() function: SELECT ISNULL(Column, 'Default').

• Q: Can I test for multiple NULLs in one query?
  A: Yes, with WHERE Col1 IS NULL OR Col2 IS NULL.

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