Amed is utilizing a feature that will use two tables. The first table contains a primary key matched to a foreign key in the sec
ond table. The query results will include all entries from the first table. Which feature is he using?
A. left outer join
B. right outer join
C. self join
D. inner join
(edge 2021)
A. left outer join
B. right outer join
C. self join
D. inner join
(edge 2021)
2 answers:
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Answer:
LA15; LA22
LA16; LA31; LA32
LA169; LA126;
LA127; LA141
Explanation:
Given
Required
Course sequence to satisfy the prerequisite
From the course prerequisite, we have:
and
This means that LA15 and LA22 are the base courses, and they have no prerequisite. So, we have:
LA16 and LA31 have LA15 as their direct course prerequisite. So, the sequence becomes
To complete the sequence, we read each course and place them other their prerequisite.
<em>See attachment for complete tree</em>
<em></em>
From the tree, we have the sequence to be:
<em>LA15; LA22</em>
<em>LA16; LA31; LA32</em>
<em>LA169; LA126;</em>
<em>LA127; LA141</em>
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