When can you NOT use a Type I nested query to perform a join in a SELECT statement?1 pointThe table in the nested query has row conditions.The table in the nested query has a combined primary key.The table in the nested query has an optional foreign key.The table in the nested query provides columns in the result of the outer query.13.Question 13When must you use a Type I nested query in an UPDATE or DELETE statement?
Question
When can you NOT use a Type I nested query to perform a join in a SELECT statement?1 pointThe table in the nested query has row conditions.The table in the nested query has a combined primary key.The table in the nested query has an optional foreign key.The table in the nested query provides columns in the result of the outer query.13.Question 13When must you use a Type I nested query in an UPDATE or DELETE statement?
Solution
You cannot use a Type I nested query to perform a join in a SELECT statement when the table in the nested query provides columns in the result of the outer query. This is because the nested query is evaluated once for the entire SQL statement, and thus cannot provide different results for different rows of the outer query.
You must use a Type I nested query in an UPDATE or DELETE statement when you need to reference a single value that is returned from a subquery. This is because Type I nested queries are designed to return a single value, and thus are suitable for situations where you need to compare a column value with a single value.
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