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SQLite IS NOT NULL operator This picture illustrates the partial output: In this tutorial, you have learned how to check if values in a column or an expression is NULL or not by using the IS NULL and IS NOT NULL operators. Was this tutorial helpful ?
SQLite NULL is the term used to represent a missing value. A NULL value in a table is a value in a field that appears to be blank.
The SQLite IS NOT NULL condition is used to test for a NOT NULL value in a SELECT, INSERT, UPDATE, or DELETE statement.
There are several ways, like:
where some_column is null or some_column = ''
or
where ifnull(some_column, '') = ''
or
where coalesce(some_column, '') = ''
of
where ifnull(length(some_column), 0) = 0
It looks like you can simply do:
SELECT * FROM your_table WHERE some_column IS NULL OR some_column = '';
Test case:
CREATE TABLE your_table (id int, some_column varchar(10));
INSERT INTO your_table VALUES (1, NULL);
INSERT INTO your_table VALUES (2, '');
INSERT INTO your_table VALUES (3, 'test');
INSERT INTO your_table VALUES (4, 'another test');
INSERT INTO your_table VALUES (5, NULL);
Result:
SELECT id FROM your_table WHERE some_column IS NULL OR some_column = '';
id
----------
1
2
5
Maybe you mean
select x
from some_table
where some_column is null or some_column = ''
but I can't tell since you didn't really ask a question.
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