In SQLite, the total() function returns the sum of all non-NULL values in a group.
If there are no non-NULL values, then it returns 0.0.
This function is similar to the sum() function, except in the way it handles NULL inputs. When there are no non-NULL values, then sum() returns NULL (instead of 0.0 like the total() function returns).
The SQLite sum() function returns the sum of all non-NULL values in a group.
If there are no non-NULL values, then it returns NULL.
This function basically enables you to add up all the values in a result set or a table.
Continue readingThe SQLite min() function returns the minimum non-NULL value from all values in a group.
The minimum value is the value that would appear first in a query that uses an ORDER BY clause on the same column.
The SQLite max() function returns the maximum value from all values in a group.
The maximum value is the value that would appear last in a query that uses an ORDER BY clause on the same column.
The SQLite avg() function returns the average value of all non-NULL values within a group.
It accepts one argument, which is the value or group of values.
Continue readingIf you need to add a “count” column to the result set of a database query when using SQLite, you can use the count() function to provide the count, and the GROUP BY clause to specify the column for which to group the results.
The SQLite count() function can be used to return the number of rows in a result set.
It can also be used to return the number of times a given column is not NULL in the result set.
It can be used in two ways. If you pass in the asterisk (*) wildcard character, it will return the total number of rows in the group. If you provide the name of a column, it will return the number of times that column is not NULL.
In MySQL, the difference between the MIN() and LEAST() functions is exactly the same as the difference between the MAX() and GREATEST() functions.
In each case, both functions perform a similar operation, but they do have a different syntax.
At first glance, the MySQL MAX() and GREATEST() functions perform a similar operation. They both return the maximum value from a range of values. However, there’s a difference between these two functions.
The best way to see the difference between these two functions is to compare their syntax.
The MySQL MIN() function is an aggregate function that returns the minimum value from an expression.
Typically, the expression would be a range of values returned as separate rows in a column, and you can use this function to find the minimum value from the returned rows. If there are no matching rows, MIN() returns NULL.
For example, you can use this function to find out which city has the smallest population out of a list of cities.