Menu
I am getting NULL values in the results of an operation in MySQL.
Is there a way to convert the NULL values into the value 0?
676
Conceptually, NULL means “a missing unknown value” and it is treated somewhat differently from other values. Because the result of any arithmetic comparison with NULL is also NULL , you cannot obtain any meaningful results from such comparisons. In MySQL, 0 or NULL means false and anything else means true.
The ISNULL Function is a built-in function to replace nulls with specified replacement values. To use this function, all you need to do is pass the column name in the first parameter and in the second parameter pass the value with which you want to replace the null value.
Null values are replaced with mean/median.
Yes, by using COALESCE.
SELECT COALESCE(null_column, 0) AS null_column FROM whatever;
COALESCE goes through the list of values you give it, and returns the first non-null value.
73
I am adding this answer because no one mentioned IFNULL function
You can use IFNULL
SELECT IFNULL(column_name, 0) FROM table_name; IFNULL will return column's value (if it has something other than NULL) otherwise second parameter passed (in this case 0).
20
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
