L. @worthlesscoder
Learner. All About Data Analytics, DevOps, and MERN Stack. Joined September 2025-
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@jatinprajapat29 const containsDuplicate = function(nums){ const set = new Set(); for(const num of nums){ if(set.has(num)){ return true; } set.add(num); } return false; }
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Done with my first EDA project from Luke Barousse's Data Engineering Bootcamp.
Advantages: Stores data physically. Can create indexes. Useful when the same intermediate data is referenced multiple times. Often improves performance for large datasets. Disadvantages: Uses disk or temp storage. Requires creation and cleanup (depending on the database system).
1. CTE (Common Table Expression) A CTE is a named result set that exists only for the duration of a single SQL statement. Example: WITH HighSalary AS ( SELECT * FROM Employees WHERE Salary > 80000 ) SELECT Name FROM HighSalary;
3. Temporary Table A temporary table stores data physically and exists only temporarily.
Advantages: Reusable by many users. Simplifies complex queries. Can improve security by exposing only selected columns. Disadvantages: Doesn't usually store data. Performance depends on the underlying query.
In SQL, IN is used when you want to check if a column value matches any value in a list.
In SQL, BETWEEN is used to filter values within a range (inclusive).
AND is a logical operator used to combine multiple conditions.
The < operator means "less than". It selects rows where the value in a column is smaller than the specified value.
The > operator means "greater than". It returns rows where the value in a column is larger than the specified value.
Comparison Operators in SQL: In SQL, = is the equality operator. It checks whether a column's value is equal to a specified value.
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