SQL For Dummies, 9th Edition
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The SQL set functions give you a quick answer to questions you may have about the characteristics of your data as a whole. How many rows does a table have? What is the highest value in the table? What is the lowest? These are the kinds of questions that the SQL set functions can answer for you.
Function Effect
COUNT Returns the number of rows in the specified table
MAX Returns the maximum value that occurs in the specified able
MIN Returns the minimum value that occurs in the specified table
SUM Adds up the values in a specified column
AVG Returns the average of all the values in the specified column
LISTAGG Transforms values from a group of rows into a delimited string

Trigonometric and Logarithmic Functions

sin, cos, tan, asin, acos, atan, sinh, cosh, tanh, log(, ), log10(). ln( )

JSON Constructor Functions

JSON_OBJECT

JSON_ARRAY

JSON_OBJECTAGG

JSON_ARRAYAGG

JSON Query Functions

JSON_EXISTS

JSON_VALUE

JSON_QUERY

JSON_TABLE

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Allen G. Taylor is a 30-year veteran of the computer industry and the author of over 40 books, including SQL For Dummies and Crystal Reports For Dummies. He lectures nationally on databases, innovation, and entrepreneurship. He also teaches database development internationally through a leading online education provider.

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