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Database: PC and Employee
- 1. Nicole Gaehle Leah Kinnamon IS 3845 Dr Joshi Tuesday2-4:40pm Journal B – Database 1. We have two tables PCandEmployee. KeepPCasthe leftone andEmployee asthe rightone.Show hand calculated/tabulatedresultsforthese operations astables ina worddocument,withoutusingOracle oranyotherquery engine. a. Showa product of the two PC# MODEL MAKE PC.EMP# E.EMP# ENAME DEPT TEL# 29 X500 HP 111 111 TIM MKT 9121 29 X500 HP 111 115 KIM FIN 9321 29 X500 HP 111 118 JANE FIN 9432 38 GP550 HP 118 111 TIM MKT 9121 38 GP550 HP 118 115 KIM FIN 9321 38 GP550 HP 118 118 JANE FIN 9432 32 MINI202 SONY 111 111 TIM MKT 9121 32 MINI202 SONY 111 115 KIM FIN 9321 32 MINI202 SONY 111 118 JANE FIN 9432 24 DX3900 DELL 111 TIM MKT 9121 24 DX3900 DELL 115 KIM FIN 9321 24 DX3900 DELL 118 JANE FIN 9432 b. Showa joinof the two. PC # MODEL MAKE EMP # ENAME DEPT TEL # 29 X500 HP 111 TIM MKT 9121 38 GP550 HP 118 JANE FIN 9432 32 MINI202 SONY 111 TIM MKT 9121 c. Showa leftouterjoinof the two.What doesit represent? PC # MODEL MAKE EMP # ENAME DEPT TEL # 29 X500 HP 111 TIM MKT 9121 38 GP550 HP 118 JANE FIN 9432 32 MINI202 SONY 111 TIM MKT 9121 24 DX38900 DELL Thisshowseverythingonthe PC table andanythingthatrelatesfromthe EMPLOYEE table to the PC table.
- 2. d. Showa rightouter joinof the two.What doesit represent? PC # MODEL MAKE EMP # ENAME DEPT TEL # 29 X500 HP 111 TIM MKT 9121 32 MINI202 SONY 111 TIM MKT 9121 115 KIM FIN 9321 38 GP550 HP 118 JANE FIN 9432 Thisshowseverythingonthe EMPLOYEE table andanythingthat relatesfromthe PCtable to the EMPLOYEE table. e.Draw set diagramcirclesshowing EMP#from eachsetthat are commonand the onesthat are notcommon but exclusivetoone setor the other.
- 3. Prepare the answerstothese forclassdiscussion –Don’t needtoturn themin. 1. List all the rulesapplicable tothe use of Group BY statementinSQLqueries. Difference betweenWhere andHaving. 2. Which differentconnectorscanbe used(listall) tolinkthe resultsof asubquerytoa mainquery(withitscolumn)? Can youuse a columnof outerqueryinside asubqueryandvice versa,i.e., canyouuse a columnof the subqueryinthe outerquery? 3. How wouldyouadd twocolumnsgivingatotal column?Andhow wouldyouadd the contentsof a columngivingthe total. PC PC# Model Make Emp# 29 X500 HP 111 38 GP550 HP 118 32 Mini202 Sony 111 24 DX3900 Dell Employee Emp# Ename Dept Tel# 111 Tim MKT 9121 115 Kim FIN 9321 118 Jane FIN 9432