1241, 'Operand should contain 1 column(s)'

This error typically occurs when a SQL query is attempting to retrieve multiple columns of data, but the operation being performed only allows for a single column.

For example, if a query is written to select both the name and age of all employees in a database, but the operation being performed only allows for one column (such as sorting or filtering), the error message will appear.

To resolve this issue, the query should be modified to only select the required column(s) for the intended operation. Alternatively, the operation being performed may need to be adjusted to allow for multiple columns of data.