Advanced SQL Interview Questions and Answers Part 2 Practice Interview Question 2 continued Data Mining vs. Data Warehousing Ternary/Three-valued Logic in SQL Find Maximum Value Without Using Aggregate SQL Injection Example and Tutorial SQL Injection Prevention Blind SQL Injection Example Parameterized Quer...
Btw, I expect that you are familiar with SQL and know different SQL commands and their meaning in a SQL query. If you are not, it's better you gain some experience with SQL by joining a good course like The Complete SQL Bootcamp course by Josh Portilla, a Data Scientist, on Udemy. ...
In this puzzle, we’re going to learn how to rewrite a subquery using inner joins. Knowing about a subquery versus inner join can help you with interview questions and performance issues. Though subqueries have unique abilities, there are times when it is better to use other SQL constructs su...
Sql - Update a column using Subquery in oracle, This is called correlated subquery: This is your query: update department p set counts = (select count (*) from EMPLOYEE e where p.dept_id = … Using subquery in update statement Question: To update table A, I require a value from a fi...