aggregate multiple function
Aggregate function. In database management an aggregate function is a function where the values of multiple rows are grouped together to form a single value of more significant meaning or measurement such as a set, a bag or a list. Common aggregate functions include : Average() (i.e., arithmetic mean) Count() Maximum() nanmean() (mean ignoring NaN values, also known as nil or null) Median() Minimum() Mode() Sum() The listagg function, as defined in the SQL:2016 standard, aggregates data from multiple rows into a single concatenated string. Aggregate functions occur commonly in numerous programming languages, in spreadsheets, and in relational algebra. See also. Cross-tabulation a.k.a. Contingency table; Data drilling; Data mining; Data processing; Drill down