The NVL function in Oracle returns an alternative value when an expression is NULL.
It is useful in queriis where we do not want to displaand emptand fields, for example in reports, lists, or simple calculations.
Tag: Oracle Developer
The Oracle DECODE function
The Oracle DECODE function can be considered an IF/ELSE variation. It compares the very same expression with other or others. Continue reading “The Oracle DECODE function”
Oracle date format
Let’s review Oracle date formatting.
This is useful for functions like TO_DATE, TO_CHAR or alter session to modify nls_date_format. Continue reading “Oracle date format”
Oracle numeric format
Let’s take a look at the Oracle numeric format masks. Continue reading “Oracle numeric format”
The Oracle NULLIF function
The NULLIF function evaluates two expressions in the following way:
- If they are equal, it returns NULL.
- If they are not equal, it returns the first expression.
The Oracle NVL2 function
NVL2 provides a similar functionality as NVL function.
This function evaluates a column or expression in the following way:
- If the result is not NULL, it returns the second parameter that was given to NVL2 function.
- If the result is NULL, it returns the third parameter that was given to NVL2.