The below query is correct or In-correctselect * from actors where actor_id in (select* from film_actor)a.Trueb.False

Break Down the Problem

1. Analyze the SQL query provided to determine its correctness.
2. Identify the inner and outer queries.
3. Review syntax and logic used in the SQL commands.

Relevant Concepts

1. Subqueries: A subquery is a query nested inside another query, and its structure needs to be valid.
2. SQL Syntax: The SQL command must follow proper syntax rules, including spaces and keywords.
3. Logical Operations: The IN clause is used to retrieve rows that match any value in a list.

Analysis and Detail

1. The outer query selects all columns from the actors table where actor_id is in the results of the inner query.
2. The inner query is select * from film_actor, which is syntactically correct; however, if the film_actor table has more than one column, this could cause issues when trying to match with actor_id.

Verify and Summarize

• The inner query returns potentially multiple columns, but the IN clause can only work with a single column.
• Therefore, the query will raise an error due to incorrect usage of the subquery.

Final Answer

The statement is False; the subquery should select only the relevant column, for example, SELECT actor_id FROM film_actor instead of SELECT *.