Informatics Practices
Assertion. The GROUP BY clause yields summary results using group functions.
Reason. The GROUP BY clause combines a number of rows in a group and applies functions on it.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
SQL Queries
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation
The GROUP BY clause yields summary results using group functions because it combines all records that have identical values in a particular field or a group of fields. This grouping results in one summary record per group if group functions are used with it.
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Related Questions
Assertion. MOD() and MIN() are numeric functions, yet they are different types of functions.
Reason. MOD() is a single-row function and MIN() is a group function.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion. The GROUP BY clause can use any type of function.
Reason. The GROUP BY clause combines a number of rows in a group and applies functions on it.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion. Both WHERE and HAVING clauses work with GROUP BY in a SELECT statement.
Reason. The WHERE clause is applied before forming groups of rows and HAVING clause is applied after forming the groups.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion. Both WHERE and HAVING clauses are used to specify conditions.
Reason. The WHERE and HAVING clauses are interchangeable.