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In database management an aggregate function is a function where the values of multiple rows are grouped together as input on certain criteria 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)
Using Conversion Functions. Besides the SQL utility functions, Oracle inbuilt function library contains type conversion functions. There may be scenarios where the query expects input in a specific data type, but it receives it in a different data type.