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Inputing column values in one table from another related table

You can try this:

    Select MAX(

where exists 
    select 1

This correlated subquery is calculated for each row in ISB_COURSE_REGISTRATIONS


So if it returns several rows for a certain it's not clear which one to set as a value.

Applying MAX( to the all rows of this subquery guarantees there will only one row.

But you should be careful with this update. Maybe there are different courses a student attended and mybe there different degrees for each course.

Categories : SQL

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