Queries to a database _____________________.
Queries to a database _____________________.
The correct option is B Can use aggregate functions like SUM and count
Queries to a database can use aggregate functions like
SUM and count.
A query is a request for data or information from a database table or combination of
tables. This data may be generated as results returned by structured query language (SQL).
COUNT function:-
The COUNT function returns the total number of values in
the specified field. It works on both numeric and non-numeric data types. All aggregate functions by default exclude
nulls values before working on the data.
COUNT (*) is a special implementation of the COUNT
function that returns the count of all the rows in a specified table. COUNT (*)
also considers nulls and duplicates.
SUM function:-
We can use the MySQL SUM function which returns the sum of all the values in the
specified column. SUM works
on numeric fields only. Null
values are excluded from the result returned.
Queries to a database can use aggregate functions like SUM and count.
A query is a request for data or information from a database table or combination of tables. This data may be generated as results returned by structured query language (SQL).
COUNT function:-
The COUNT function returns the total number of values in the specified field. It works on both numeric and non-numeric data types. All aggregate functions by default exclude nulls values before working on the data.
COUNT (*) is a special implementation of the COUNT function that returns the count of all the rows in a specified table. COUNT (*) also considers nulls and duplicates.
SUM function:-
We can use the MySQL SUM function which returns the sum of all the values in the specified column. SUM works on numeric fields only. Null values are excluded from the result returned.
