SQL ISNULL (), NVL (), IFNULL () and COALESCE () Functions
SQL IFNULL (), ISNULL (), COALESCE (), and NVL () Functions Look at the following "Products" table: ... Suppose that the "UnitsOnOrder" column is optional, and may contain NULL values. Look at the …
MySQL IFNULL () and COALESCE () Functions - W3Schools
MySQL IFNULL () and COALESCE () Functions Look at the following "Products" table:
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Definition and Usage The time module provides functions for working with time values and delays. Use it to measure elapsed time, add delays, format timestamps, or convert between time representations.