In a subquery, you can use group by, but your syntax is incorrect.
Wherever expressions are allowed, subqueries can be used in SELECT, INSERT, UPDATE, and DELETE statements. A subquery can be used as a table expression in the FROM clause or as one of the column expressions in a SELECT list.
An example of a typical correlated subquery is shown below. In this case, the goal is to locate all employees with salaries that are higher than the average for their department. WHERE salary >... SELECT employee number, name FROM employees emp The inner query in the above nested query must be re-executed for each employee.
It is the usage of a SELECT statement inside one of the clauses of another SELECT statement in a more formal sense. A subquery can, in reality, be contained within another subquery, which is contained within another subquery, and so on.
The subquery can be nested inside another subquery or inside a SELECT, INSERT, UPDATE, or DELETE statement. A subquery is frequently added to another SQL SELECT statement's WHERE Clause. You can use comparison operators like >,, or = to make a comparison.
Very Good trainer
you guys are doing nice job. thanks
Not too much interactive
Well Explained in Every Chapters..
GAJANAN DIGAMBAR MODE
very easy to understand SQL its was dream to learn SQL. Thanx for Learnvern
Why you didn't teach/learn how to write select query, even you shared 15 question for practice :(
I have found the course to be interesting with plenty of valuable information provided as part of the course and through interaction with fellow teachers and trainers from a wide range of disciplines
Share a personalized message with your friends.