Vendor order (vendor no, order no, vendor name, qty provided, price/unit) is a second normal form relation. a. vendor (order number, vendor name, quantity delivered, price/unit) O b. vendor (vendor no, vendor name) order (order no, qty provided, price/unit) order (vendor, order) O c vendor (vendor no, vendor name) order (order no, quantity given, price/unit) O d. vendor (vendor no, vendor name) qty (qty provided, price/unit) order (order no, quantity supplied)

5. For the following simple seven-activity project, develop a precedence network, calculate all relevant characteristics of each activity (ES, EF, LS, LF, TF), and calculate the project duration. Then draw a time-scaled network and under it a labor resource histogram for the ES. Do the same for the LS. In both cases, use the maximum allowable number of workers. Make adjustments to the noncritical activities, within the constraints of the ES and LF and the maximum and minimum workers allowed to provide what you feel is the best labor distribution. Please use Table B (Table B.pdf) Lastly, Explain in detail what do you feel is the biggest problem with the ES and LS configurations, and how has this been alleviated with your solution?

Which of the following statements corresponds to the second normal form for an entity - relationship model in relational databases? A relationship must have only one key and the attributes můst have simple donains B A relationship must have a Kev, with simple domains for its attributes and all non-key attributes depend entirely on the key A relationship must have a key with static domains for its attributes which all depend on the key A relationship must have only one key with all attributes dependent on the key. A. D

What are three cases when a surrogate key might be used in place of a relation's main key?

Let R₁ and R₂ be the relations on X={a,b,c}, R₁={ (b,a), (c,b), (a,c) } R₂={ (a,c), (b,c)} R₁-¹= R₂ ° R₁=

7

Primary key identifies a unique tuple of a relation, true or false?

a) Complete the object conceptual data model for the following relational schema. Branch BranchID Location B001 Shatin ВО02 Homantin Order OrderID SalesTotal BranchID 0001 100 BO01 0002 200 BO02 0003 300 BO01 BranchID is the primary key of Branch table. OrderID is the primary key of Order table. BranchID in Order table is the foreign key references Branch table. Now, assume the OIDS are given below: Branch BranchID Location OID B001 Shatin OID1 B002 Homantin OID2 Order OrderID SalesTotal BranchID OID 0001 100 ВО01 OID3 0002 200 ВО02 OID4 0003 300 ВО01 OID5

Problem: design a er diagram for a database to keep track of building inspections required by a department of Damaged Buildings (DB). DB  building inspections are requested by builders every month. Each building inspection is either passed or not. Inspections have a type code (3 characters, e.g. PLU, FRM, ELE, etc.) and possibly sequencing requirements. Some inspections cannot be performed before other inspections, e.g. final plumbing inspection cannot be performed until the framing inspection is passed. Each inspection has a numeric score, with 75 or more out of 100 being sufficient for a pass status. Each inspection data contains the date of inspection, inspector identification, inspection score, and textual information about the inspection. The textual information can be updated later, but the score can never be changed. FODB maintains a pool of inspectors. Each inspector has a unique 5 digit employee ID, name, and date they were hired. They can conduct any type of inspection but…

14. A _____ is a property of the entire relation, rather than of the individual tuples in which each tuple is unique. a. Rows b. Key c. Attribute d. Fields