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  • Function in SQL

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    Function in SQL

    There are two type of function in sql

    SQL aggregate function

    1) AVG() - Returns the average value

        SELECT AVG(column_name) FROM table_name

    2) COUNT() - Returns the number of rows

        SELECT COUNT(column_name) FROM table_name;

    3) FIRST() - Returns the first value

        SELECT FIRST(column_name) FROM table_name;

    4) LAST() - Returns the last value

    SELECT LAST(column_name) FROM table_name;

    5) MAX() - Returns the largest value

     SELECT MAX(column_name) FROM table_name;

    6) MIN() - Returns the smallest value

    SELECT MIN(column_name) FROM table_name;

    7) SUM() - Returns the sum

    SELECT SUM(column_name) FROM table_name;

    SQL scalar function

    1) UCASE() - Converts a field to upper case

        SELECT UCASE(column_name) FROM table_name;

    2) LCASE() - Converts a field to lower case

        SELECT LCASE(column_name) FROM table_name;

    3) MID() - Extract characters from a text field

    SELECT MID(column_name,start[,length]) AS some_name FROM table_name;

    4) LEN() - Returns the length of a text field

    SELECT LEN(column_name) FROM table_name;

    5) ROUND() - Rounds a numeric field to the number of decimals specified

    SELECT ROUND(column_name,decimals) FROM table_name;

    6) NOW() - Returns the current system date and time

    SELECT NOW() FROM table_name;

    7) FORMAT() - Formats how a field is to be displayed

        SELECT FORMAT(column_name,format) FROM table_name;

    You can also define your function they are called procedure.

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