sql - how to add more rows to a existing table -

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There are many columns in the table trainer for column only name Want to add more values ​​and get the value table from student The condition is that the student's name with tot_cred & gt; 100 is chosen My attempt is down but this error returns back. How can I solve this problem?

Update Instructor Set ID = (Choose ID from student where tot_cred & gt; '100');

The error is that

returned more than the subkey1 value. When subquery =,! =, & Lt;, & lt; =,>,> = Or when the subquery is used as an expression is not allowed. 

  update trainer set a.name = (student name name) Where id = a.id) where exists (where the student 'Select' id is = A.id and tot_cred & gt; '100');

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