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30 Dec 2020

This chapter describes the functions and operators that are permitted for writing expressions in MySQL. SQL aggregate functions return a single value, calculated from values in a column. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail: W3Schools is optimized for learning and training. Function names must comply with the rules for identifiersand must be unique within the database and to its schema. Functions always return a value and can optionally accept parameters. The SUM () function returns the total sum of a numeric column. specified base, Returns the natural logarithm of a number to base 10, Returns the maximum value in a set of values, Returns the minimum value in a set of values, Returns the value of a number raised to the power of another number, Rounds a number to a specified number of decimal places, Adds a time/date interval to a date and then returns the date, Returns a date from the specified parts (year, month, and day values), Returns a specified part of a date (as string), Returns a specified part of a date (as integer), Returns the day of the month for a specified date, Returns the current database system date and time, Returns the current database system UTC date and time, Checks an expression and returns 1 if it is a valid date, otherwise 0, Returns the month part for a specified date (a number from 1 to 12), Returns the date and time of the SQL Server, Returns the year part for a specified date, Converts a value (of any type) into a specified datatype, Returns the first non-null value in a list, Returns the name of the current user in the SQL Server database, Returns a value if a condition is TRUE, or another value if a condition is FALSE, Return a specified value if the expression is NULL, otherwise return the This reference contains string, numeric, date, … SQL Data Types. delimiter occurs, Removes leading and trailing spaces from a string, Returns the arc tangent of one or two numbers, Returns the average value of an expression, Returns the smallest integer value that is >= to a number, Returns the number of records returned by a select query, Returns e raised to the power of a specified number, Returns the largest integer value that is <= to a number, Returns the greatest value of the list of arguments, Returns the smallest value of the list of arguments, Returns the natural logarithm of a number, Returns the natural logarithm of a number, or the logarithm of a number to a Expressions can be written using literal values, column values, NULL, built-in functions, stored functions, user-defined functions, and operators. MySQL supports window functions that, for each row from a query, perform a calculation using rows related to that row. They can be categorized according to the data types that they operate on i.e. Examples might be simplified to improve reading and basic understanding. The first section provides descriptions of the nonaggregate window functions. Examples might be simplified to improve reading and learning. OR ALTERApplies to: SQL Server ( SQL Server 2016 (13.x) SP1 and later) and Azure SQL Database Conditionally alters the function only if it already exists. A stored function is a special kind stored program that returns a single value. If you would like to install both the mysql extension and the mysqli extension you should use the same client library to avoid any conflicts. SQL Quick Reference. MySQL Aggregate Functions Aggregate functions allow you to perform a calculation on a set of records and return a single value. 2. 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