程序代写代做代考 explain_plans

explain_plans

By creating index on id of table student , it is over 30 times faster.

The performance improves by using index.

Query 1

Query 2

The optimized one doesn’t join the table course , the usage of student_id_index and
Transcript_studId_index also improves the performance.

Query 3

The usage of Professor_name_index , Teaching_profId_index , and
Transcript_crsCode_index makes the execution much faster.

Query 4

The usage of course_deptId_index , Transcript_crsCode_index , and

Query 5

student_id_index improves the performance.

The usage of course_deptId_index , Transcript_crsCode_index , and
student_id_index improves the performance.

Query 6