The WHERE clause<\/strong> in SQL is used to filter records in a table based on a specified condition. It allows you to retrieve only the rows that meet certain criteria, making your queries more precise and efficient.<\/p>\n\n\n\n Retrieve all employees from the “Employees” table who work in the “Sales” department:<\/p>\n\n\n\n You can use comparison operators such as Combine multiple conditions using Use This retrieves all employees whose first name starts with “J”.<\/p>\n\n\n\n Check for NULL values with Syntax<\/h2>\n\n\n\n
SELECT column1, column2
FROM table_name
WHERE condition;<\/pre>\n\n\n\n\n
Example 1: Basic Filtering<\/h2>\n\n\n\n
SELECT FirstName, LastName, Department
FROM Employees
WHERE Department = 'Sales';<\/pre>\n\n\n\nExample 2: Using Comparison Operators<\/h2>\n\n\n\n
=<\/code>, ><\/code>, <<\/code>, >=<\/code>, <=<\/code>, <><\/code>:<\/p>\n\n\n\nSELECT FirstName, LastName, Salary
FROM Employees
WHERE Salary > 50000;<\/pre>\n\n\n\nExample 3: Using Logical Operators<\/h2>\n\n\n\n
AND<\/code>, OR<\/code>, and NOT<\/code>:<\/p>\n\n\n\nSELECT FirstName, LastName, Department, Salary
FROM Employees
WHERE Department = 'Sales' AND Salary > 50000;<\/pre>\n\n\n\nExample 4: Using Pattern Matching<\/h2>\n\n\n\n
LIKE<\/code> to search for a specific pattern:<\/p>\n\n\n\nSELECT FirstName, LastName
FROM Employees
WHERE FirstName LIKE 'J%';<\/pre>\n\n\n\nExample 5: Using NULL Values<\/h2>\n\n\n\n
IS NULL<\/code> or IS NOT NULL<\/code>:<\/p>\n\n\n\nSELECT FirstName, LastName, ManagerID
FROM Employees
WHERE ManagerID IS NULL;<\/pre>\n\n\n\nKey Points to Remember<\/h2>\n\n\n\n
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()<\/code> to group conditions for complex queries.<\/li>\n\n\n\n