Aggregate and Scalar Functions
Another way of categorizing functions is in terms of whether they operate on values from just one row at a time, on values from a collection, or on a set of rows. Aggregate functions operate against a collection of values and return a single summarizing value. Scalar functions return a single value based on scalar input arguments. Some scalar functions, such as CURRENT_TIME, do not require any arguments.
Get SQL in a Nutshell, 3rd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
