![]() Then, the SUM function calculates the sum of lengths of tracks per album. To calculate the total length of each album, you need to use the SUM function with the GROUP BY clause.įirst, the GROUP BY clause groups a set of tracks by albums. Try It SQLite SUM function with GROUP BY clause Tracks Code language: SQL (Structured Query Language) ( sql ) To get the total length of all tracks in the tracks table, you use the SUM function as the following statement: SELECT SUM(milliseconds) We will use the tracks table in the sample database for the demonstration. In case there is an integer overflow error happens and all input values are NULL or integers, the SUM function throws an integer overflow exception. The result of the SUM function is NULL if and only if all input values are NULL. If any input value is neither an integer nor a NULL value, the result of the SUM function is a floating-point value. The result of the SUM function is an integer if all input non-NULL values are integers. If you want to calculate the sum of unique values, you have to specify the DISTINCT clause explicitly in the expression. It means that all the input values, whether duplicate or not, are considered when the SUM function performs the calculation. The SUM function uses ALL clause by default. The following expression illustrates the syntax of the SUM function: SUM( expression) Code language: SQL (Structured Query Language) ( sql ) The SUM function is an aggregate function that returns the sum the non-NULL values or only the distinct values in a group. Summary: in this tutorial, you will learn how to use the SQLite SUM function to calculate the sum of all values.
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