Subquery returns more than 1 row
时间: 2023-10-28 10:48:08 浏览: 43
This error occurs when a subquery returns multiple rows of data to the main query, but the main query is expecting only one row. This can happen when using a subquery in a comparison or a condition that expects a single value.
To resolve this error, you can try one or more of the following:
1. Change the subquery to return a single value. You can use a function like MAX, MIN, or AVG to aggregate the results of the subquery.
2. Use a LIMIT statement to restrict the subquery to return only one row.
3. Modify the main query to handle multiple rows returned by the subquery. This may involve using a join instead of a subquery or using a different comparison or condition.
4. Check the data in the tables being queried to ensure there are no duplicates or unexpected values that may cause the subquery to return multiple rows.
5. Use a different subquery that returns only one row or use a different method to retrieve the data needed for the main query.