I encountered the error 'Scalar subquery might produce more than one row' in my SQL query. The query involves a scalar subquery that should only return one value, but it's throwing this error. Here is the SQL query that triggers the error:
Charlie
Asked on Sep 27, 2023
The error 'Scalar subquery might produce more than one row' occurs when a scalar subquery in the SQL query returns multiple rows instead of a single value.
To resolve this issue, you can use the 'LIMIT 1' clause in your subquery to ensure that only one row is returned.
Here is an example of how you can modify your SQL query to avoid the error:
CREATE TABLE demo1 (name string, PRIMARY KEY (name));
INSERT INTO demo1(name) VALUES ('demoname');
SELECT SUBSTR((SELECT name FROM demo1 LIMIT 1), 2);By adding 'LIMIT 1' to your subquery, you can ensure that it returns only one row and resolves the error.