.Question 20Indicate when a SELECT statement for a containment exception should use the DISTINCT keyword inside the COUNT function in the HAVING condition.1 pointthe COUNT function applies to a unique column of the outer query.the COUNT function applies to a non unique column of the outer querythe COUNT function applies to the entire row of the nested query.the COUNT function applies to the entire row of an outer query.
Question
.Question 20Indicate when a SELECT statement for a containment exception should use the DISTINCT keyword inside the COUNT function in the HAVING condition.1 pointthe COUNT function applies to a unique column of the outer query.the COUNT function applies to a non unique column of the outer querythe COUNT function applies to the entire row of the nested query.the COUNT function applies to the entire row of an outer query.
Solution
A SELECT statement for a containment exception should use the DISTINCT keyword inside the COUNT function in the HAVING condition when the COUNT function applies to a non-unique column of the outer query.
Here's the step-by-step explanation:
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The DISTINCT keyword is used in SQL to return only distinct (different) values. This means it eliminates duplicate records in the result set.
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The COUNT function is used to count the number of rows that match a specified criterion.
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In a SELECT statement for a containment exception, we are interested in finding rows in the outer query that have a certain relationship with the rows in the nested query.
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If the column we are applying the COUNT function to in the outer query is not unique (i.e., it has duplicate values), we would want to use the DISTINCT keyword. This is to ensure that we are counting only the distinct values, not the total number of rows.
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Therefore, the DISTINCT keyword should be used inside the COUNT function in the HAVING condition when the COUNT function applies to a non-unique column of the outer query.
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The Distinct Keyword In Sql Is Used To
Which of the following statements are TRUE about DISTINCT keyword? [Choose any TWO]DISTINCT keyword can be used in SELECT and WHERE clausesDISTINCT removes duplicates based on column immediately following DISTINCTDISTINCT removes duplicates based on all the columns in the SELECT clauseUsage of DISTINCT should be avoided as far as possible due to performance issues
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