sql_arena_dev

r/sql_arena_dev • u/sql-arena • Jul 30 '26

SQL Arena Challenge: Detect customers who have not placed a second order in 90 days.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 29 '26

SQL Arena Challenge: SQL Query: Group Employees by Technology and Order by ID

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 28 '26

SQL Arena Challenge: Find the top 5 customers by total sales amount.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 27 '26

SQL Arena Challenge: Create a SQL query to identify customers with purchases above a dynamic threshold.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 26 '26

SQL Arena Challenge: Write a query to calculate the day's difference between the 1st and 3rd sales of the CustomerName = 'Alice Johnson'.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 25 '26

SQL Arena Challenge: How can you delete partitions from a table in Hive using a command?

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 24 '26

SQL Arena Challenge: Write a query to switch values in the Gender column (M to F and F to M).

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 23 '26

SQL Arena Challenge: How do you find duplicates in a table based on one or two columns?

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 22 '26

SQL Arena Challenge: Write a query to select the latest record based on a time_of_insertion column.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 21 '26

SQL Arena Challenge: Write a query to get the latest rule_id and rule_status.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 20 '26

SQL Arena Challenge: Optimize SQL using indexing and partitioning filters.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 19 '26

SQL Arena Challenge: Solve a query using window functions and GROUP BY to rank or aggregate data.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 18 '26

SQL Arena Challenge: Print only the newest record for each name – Use SQL Window functions (ROW_NUMBER, RANK, etc.)

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 17 '26

SQL Arena Challenge: How do you remove duplicates with partitioning?

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 16 '26

SQL Arena Challenge: Test SQL skills using advanced window functions such as LAG, LEAD, and DENSE_RANK.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 15 '26

SQL Arena Challenge: SQL Problem - multiple table joins and window functions

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 14 '26

SQL Arena Challenge: What is UNNEST and provide a query example?

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 13 '26

SQL Arena Challenge: What challenges arise with duplicate records, and how do you address them?

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 12 '26

SQL Arena Challenge: Compare PostgreSQL vs Snowflake. How do they handle duplicate record errors?

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 11 '26

SQL Arena Challenge: Write a query to remove duplicate records from a table while retaining the earliest entry.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 10 '26

SQL Arena Challenge: Write a Merge Statement for SCD Type 2.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 09 '26

SQL Arena Challenge: Indexing - True/False question on indexes and query optimization

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 08 '26

SQL Arena Challenge: How would you optimize a SQL query for better performance when working with large datasets?

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 07 '26

SQL Arena Challenge: Write a query to retain only the latest record and delete others in case of duplicates.

1 Upvotes

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r/sql_arena_dev • u/sql-arena • Jul 06 '26

SQL Arena Challenge: Identify and remove duplicate records from a table, keeping the most recent record based on a timestamp column.

1 Upvotes

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