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How do you find records that exist in one table but not in another?
Last Updated: December 2, 2025To find records that exist in one table but not in another, either the LEFT JOIN ... WHERE ... IS...
What is the use of the PIVOT clause in SQL?
Last Updated: December 2, 2025The PIVOT clause in SQL is used to transform rows into columns, making it easier to summarize and analyze data...
How do you convert a column’s data type in SQL?
Last Updated: December 2, 2025To convert a column’s data type in SQL, I use type conversion functions like CAST() or CONVERT(). These functions are...
What is the difference between COUNT(*) and COUNT(column)?
Last Updated: December 2, 2025The main difference between COUNT(*) and COUNT(column) lies in what they count and how they handle NULL values. COUNT(*) counts...
Explain how ROW_NUMBER() works in SQL.
Last Updated: December 2, 2025ROW_NUMBER() is a window function in SQL that assigns a unique sequential number to each row within a result set,...
How do you calculate the total number of records in a table?
Last Updated: December 2, 2025To calculate the total number of records in a table, I use the COUNT() aggregate function in SQL. It’s one...
Explain the difference between DELETE and TRUNCATE.
Last Updated: December 2, 2025The main difference between DELETE and TRUNCATE in SQL lies in how they remove data and how they impact performance,...
What is a CTE (Common Table Expression)?
Last Updated: December 2, 2025A CTE (Common Table Expression) is a temporary, named result set in SQL that you can reference within a SELECT,...
How do you handle duplicate rows in SQL?
Last Updated: December 2, 2025Handling duplicate rows in SQL depends on whether you want to find, remove, or prevent them. I usually start by...
What is the WITH clause used for in SQL?
Last Updated: December 2, 2025The WITH clause in SQL is used to define a Common Table Expression (CTE) — basically, a temporary, named result...