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.
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.
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.