Intermediate SQL Coding Questions 11. Write an SQL query to find the `Nth` highest salary from a table. 12. Write a query to remove duplicate rows from a table without using `DISTINCT`. 13.

How to Reindex SQL Tables. The indexes on a the tables of a large database make a huge difference in its performance and utility. Without an index, locating a single record in a large table can ...

9 best practices for faster SQL queries Retrieve only the columns you need Use CASE instead of UPDATE for conditional column updates Keep large-table queries to a minimum Pre-stage your data ...