Informatics Practices
Assertion. The count(*) will yield a single value while round() will yield number of values equal to the cardinality of the table.
Reason. The count (*) is a multiple-rows function and round() is a single-row 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.
SQL Queries
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Answer
Both A and R are true and R is the correct explanation of A.
Explanation
The count(*) function returns a single value, while round() will yield number of values equal to the cardinality (rows) of the table. This is because count() operates on all rows in a table (or a group of rows), producing a single result. In contrast, round() operates on each row individually, producing multiple results depending on the cardinality of the table.
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Related Questions
Assertion. Multi-row functions when applied on a column in a table, yield values which are not equal to number of rows in the table.
Reason. Multiple-rows functions do not work with all the rows in the table.
- 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. Multiple rows functions when applied on a column in a table, yield values which are not equal to number of rows in the table.
Reason. The multi-row functions work with data of multiple rows at a time and return aggregated value.
- 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.
Define a function.
Explain the UCASE() SQL function using suitable examples.