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In SQL, comments are used to add notes or explanations without affecting query execution. They help improve readability, maintainability, and debugging.
Example:
-- Retrieve all customers from the USASELECT *FROM CustomersWHERE Country = 'USA';Copied!âś•CopySingle-Line Comments (--) Start with two dashes -- and continue until the end of the line. Ideal for short explanations or disabling a single line of code.
-- Select all records from Customers tableSELECT * FROM Customers;SELECT * FROM Customers -- This ignores everything after the dashesCopied!âś•CopyInline Comments Placed after a statement on the same line using --. Useful for explaining specific clauses.
SELECT CustomerName, Country -- Display name and country onlyFROM Customers;Copied!âś•CopyMulti-Line (Block) Comments (/* ... */) Begin with /* and end with */. Suitable for longer notes or temporarily disabling multiple lines.
/*This query retrieves all customers from the USAIt is part of the monthly sales report generation*/SELECT *FROM CustomersWHERE Country = 'USA';Copied!âś•Copy SQL Comments - W3Schools
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