Answers for "sql check if column is null or empty"

how to check a db specific rows col is empty

SELECT * FROM table WHERE some_col IS NULL OR some_col = '';

check if value is null mysql

SELECT * from TABLE where CODE IS NULL OR CODE!='C'

sql check for null and empty string

IF ISNULL(@param) OR @param = '' THEN doSomething...

sql is not null

The reverse of NULL. Tests for values that aren’t empty / NULL
"Tests for empty (NULL) values.
Example: Returns users that haven’t given a contact number.
SELECT * FROM users
WHERE contact_number IS NULL;"