Database Optimization
Find the Top 10 Most Common Values in a Column
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To find the top 10 most common values in a column, you can use the COUNT() function in SQL.
SQL query to find the number of distinct values in each column of a table
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This technical problem deals with writing a SQL query to find the number of distinct values in each column of a table. The input is a table with two columns, and the output is the number of distinct values in each column.
Query a Database for Customers Who Live in a Given State and Have Made a...
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Query a database for customers who live in a given state and have made a purchase within the past 30 days.
Second highest salary from employees table
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This technical problem deals with finding the second highest salary from a table of employees. An example table is given, along with the expected output.
Finding Pairs of Rows with Values Within 10% of Each Other
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Write a SQL query to find all pairs of rows in a table where the values in the two columns are within 10% of each other.
How to Find the Top 10 Most Common Values in a Column with Millions of R ows
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To find the top 10 most common values in a given column with millions of rows, you can use a SQL query.
Find all employees with a salary greater than $50,000
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This technical problem involves writing a SQL query that returns the id, name, and salary of all employees with a salary greater than $50,000.
Find the second highest salary in a SQL table.
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Write a SQL query to find the second highest salary from the employees table. The table has columns for id and salary. The query should return the salary column.
