Can we use null in decode?
Can we use null in decode?
DECODE. The DECODE function is not specifically for handling null values, but it can be used in a similar way to the NVL function, as shown by the following example.
Is null in Decode Oracle?
In a DECODE function, Oracle considers two nulls to be equivalent. If expr is null, then Oracle returns the result of the first search that is also null.
IS NULL NULL in Oracle?
One of the most mindboggling values in the Oracle database is the NULL value. NULL is not even the same as NULL. NULL is undefined. But you need to work with NULL values (which are no actual values).
How NVL function works in Oracle with example?
Another example using the NVL function in Oracle/PLSQL is: SELECT supplier_id, NVL(supplier_desc, supplier_name) FROM suppliers; This SQL statement would return the supplier_name field if the supplier_desc contained a null value. This SQL statement would return 0 if the commission field contained a null value.
IS NULL THEN 0 in SQL?
When selecting data from a table, there might be some NULL values that you don’t want to show, or you want to replace it with 0 for the aggregate functions. Then you can use COALESCE to replace the NULL with 0.
Which is better decode or case in Oracle?
CASE is better than DECODE because it is easier to read, and can handle more complicated logic. As far as performance goes, there is minimal difference between CASE and DECODE, so it should not be a factor in your decisions.
Which converts a NULL to an actual value?
We can use SQL ISNULL to replace existing NULL values with a specific value.
How do you check if a value is NULL in SQL?
The IS NULL condition is used in SQL to test for a NULL value. It returns TRUE if a NULL value is found, otherwise it returns FALSE. It can be used in a SELECT, INSERT, UPDATE, or DELETE statement.
Can a null value be used in DECODE function?
In SQL Server, you can use CASE expression that is also supported by Oracle. Note that NULL values in DECODE function and CASE expression are handled differently . Now consider 2 statements: When you convert DECODE to CASE expression, and there is NULL condition, you have to use searched CASE form.
Is it OK to select null in to _ date?
select to_date (null, ‘mm/dd/yyyy’) from dual is a perfectly valid SQL statement that returns NULL. The error you are getting strongly implies that at least some of the rows in the start_date column are not actually strings in the format you expect or that map to invalid dates (i.e. the string ’13/35/2007′).
Can a DECODE function be used in SQL Server?
In Oracle, you can use DECODE function to evaluate a list of expressions, and if a value is matched return the corresponding result. In SQL Server, you can use CASE expression that is also supported by Oracle. Note that NULL values in DECODE function and CASE expression are handled differently.