Suppose we have a relational database with five tables.table key Attributes S(sid, A) SidT(tid, B) TidU(uid, C) UidR(sid, tid, D) sid, tid Q(tid, uid, E) tid, uidHere R implements a many-to-many relationship between the entities implemented with tables S and T, and Q implements a many-to-many relationship between the entities implemented with tables T and U.A. Write an SQL query that returns all records of the form sid, uid where sid is the key of an S- record and uid is the key of a U-record and these two records are related through the relations R and Q. Use SELECT and not SELECT DISTINCT in your query.B. Write an SQL query that returns records of the form A, C where the A-value is from an S- record and the C-value is from a U-record and these two records are related through the relations R and Q. Use SELECT and not SELECT DISTINCT in your query.C. Could one of your queries from parts (a) and (b) return more records than the other? If so, which one? Justify your answer.D. Suppose you replaced SELECT with SELECT DISTINCT in your queries from parts (a) and Could one of these modified queries return more records than the other? If so, which one? Justify your answer.E. Consider again your query from part (a). If pair sid, uid is returned by this query then there must exist at least one “path” that goes from from table S to table T (via relation R) and then from table T to table U (via relation Q).Note that there can be many such paths for a given pair sid, uid. Write an SQL query that returns records of the form tid, total where tid is a key of a record from table T and total indicates the total number of such paths that “go through” that record. Suppose we have a relational database with five tables.tablekey AttributesS(sid, A)SidT(tid, B)TidU(uid, C)UidR(sid, tid, D)sid, tidtid, uidQ(tid, uid, E)Here R implements a many-to-many relationship between the entities implemented with tables Sand T, and Q implements a many-to-many relationship between the entities implemented withtables T and U.A. Write an SQL query that returns all records of the form sid, uid where sid is the key of an S-record and uid is the key of a U-record and these two records are related through the relationsR and Q. Use SELECT and not SELECT DISTINCT in your query.B. Write an SQL query that returns records of the form A, C where the A-value is from an S-record and the C-value is from a U-record and these two records are related through therelations R and Q. Use SELECT and not SELECT DISTINCT in your query.C. Could one of your queries from parts (a) and (b) return more records than the other? If so,which one? Justify your answer.D. Suppose you replaced SELECT with SELECT DISTINCT in your queries from parts (a) andCould one of these modified queries return more records than the other? If so, which one?Justify your answer.E. Consider again your query from part (a). If pair sid, uid is returned by this query then theremust exist at least one "path" that goes from from table S to table T (via relation R) and thenfrom table T to table U (via relation Q).Note that there can be many such paths for a given pair sid, uid. Write an SQL query thatreturns records of the form tid, total where tid is a key of a record from table T and totalindicates the total number of such paths that "go through" that record.

Answered: Suppose we have a relational database…

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Suppose we have a relational database with five tables. table key Attributes S(sid, A) Sid T(tid, B) Tid U(uid, C) Uid R(sid, tid, D) sid, tid Q(tid, uid, E) tid, uid Here R implements a many-to-many relationship between the entities implemented with tables S and T, and Q implements a many-to-many relationship between the entities implemented with tables T and U. A. Write an SQL query that returns all records of the form sid, uid where sid is the key of an S- record and uid is the key of a U-record and these two records are related through the relations R and Q. Use SELECT and not SELECT DISTINCT in your query. B. Write an SQL query that returns records of the form A, C where the A-value is from an S- record and the C-value is from a U-record and these two records are related through the relations R and Q. Use SELECT and not SELECT DISTINCT in your query. C. Could one of your queries from parts (a) and (b) return more records than the other? If so, which one? Justify your answer. D. Suppose you replaced SELECT with SELECT DISTINCT in your queries from parts (a) and Could one of these modified queries return more records than the other? If so, which one? Justify your answer. E. Consider again your query from part (a). If pair sid, uid is returned by this query then there must exist at least one “path” that goes from from table S to table T (via relation R) and then from table T to table U (via relation Q). Note that there can be many such paths for a given pair sid, uid. Write an SQL query that returns records of the form tid, total where tid is a key of a record from table T and total indicates the total number of such paths that “go through” that record.

Suppose we have a relational database with five tables.
table
key Attributes
S(sid, A)
Sid
T(tid, B)
Tid
U(uid, C)
Uid
R(sid, tid, D)
sid, tid
tid, uid
Q(tid, uid, E)
Here R implements a many-to-many relationship between the entities implemented with tables S
and T, and Q implements a many-to-many relationship between the entities implemented with
tables T and U.
A. Write an SQL query that returns all records of the form sid, uid where sid is the key of an S-
record and uid is the key of a U-record and these two records are related through the relations
R and Q. Use SELECT and not SELECT DISTINCT in your query.
B. Write an SQL query that returns records of the form A, C where the A-value is from an S-
record and the C-value is from a U-record and these two records are related through the
relations R and Q. Use SELECT and not SELECT DISTINCT in your query.
C. Could one of your queries from parts (a) and (b) return more records than the other? If so,
which one? Justify your answer.
D. Suppose you replaced SELECT with SELECT DISTINCT in your queries from parts (a) and
Could one of these modified queries return more records than the other? If so, which one?
Justify your answer.
E. Consider again your query from part (a). If pair sid, uid is returned by this query then there
must exist at least one "path" that goes from from table S to table T (via relation R) and then
from table T to table U (via relation Q).
Note that there can be many such paths for a given pair sid, uid. Write an SQL query that
returns records of the form tid, total where tid is a key of a record from table T and total
indicates the total number of such paths that "go through" that record.

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