Second Normal Form - University of Kansashossein/Teaching/Fa11/... · 2001 Irwin Levinstein 2 nd...
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© 2001 Irwin Levinstein Second Normal Form Primary Key Version
Transcript of Second Normal Form - University of Kansashossein/Teaching/Fa11/... · 2001 Irwin Levinstein 2 nd...
©2001 Irwin Levinstein
Second Normal Form
Primary Key Version
©2001 Irwin Levinstein
Definition
• Relation in 1NF• Every nonprime attribute fully
functionally dependent on the key.• The full key is necessary to
determine EACH attribute.• Offending Dependency:
{part of key} � RHS
©2001 Irwin Levinstein
What offends?
©2001 Irwin Levinstein
What offends?
• 2NF has no Partial Functional Dependencies
©2001 Irwin Levinstein
What offends?
• 2NF has no Partial Functional Dependencies
• Partial Dependency:– Key has 2 or more fields.– Attribute is dependent on fewer than all
the key fields
©2001 Irwin Levinstein
What offends?
• 2NF has no Partial Functional Dependencies
• Partial Dependency:– Key has 2 or more fields.– Attribute is dependent on fewer than all
the key fields• 1NF relation with key of one
attribute must be in 2NF
©2001 Irwin Levinstein
Example of Partial Dependency
A | B | C | D | E
R_1
©2001 Irwin Levinstein
Example of Partial Dependency
A | B | C | D | E
R_1
Key
©2001 Irwin Levinstein
Example of Partial Dependency
A | B | C | D | E
R_1
Key
©2001 Irwin Levinstein
Example of Partial Dependency
A | B | C | D | E
R_1
Key• One FD in R_1: B →→→→ D
©2001 Irwin Levinstein
Example of Partial Dependency
A | B | C | D | E
R_1
Key• One FD in R_1: B →→→→ D• B determines D
©2001 Irwin Levinstein
Example of Partial Dependency
A | B | C | D | E
R_1
Key• One FD in R_1: B →→→→ D• B determines D• B is not the whole Key
©2001 Irwin Levinstein
Example of Partial Dependency
A | B | C | D | E
R_1
Key• One FD in R_1: B →→→→ D• B determines D• B is not the whole Key
• D is not Prime (not part of the key)
©2001 Irwin Levinstein
Example of Partial Dependency
A | B | C | D | E
R_1
Key• One FD in R_1: B →→→→ D• B determines D• B is not the whole Key
• D is not Prime (not part of the key)
• Therefore, B →→→→ D is a partial dependency
©2001 Irwin Levinstein
Example of Partial Dependency
A | B | C | D | E
R_1
Key• One FD in R_1: B →→→→ D• B determines D• B is not the whole Key
• D is not Prime (not part of the key)
• Therefore, B →→→→ D is a partial dependency
R_1 is NOT in 2NF
©2001 Irwin Levinstein
Curing Partial Dependency
A | B | C | D | E
R_1
B | D
R_2A | B | C | E
R_3
Foreign Keyey
©2001 Irwin Levinstein
Curing Partial Dependency
A | B | C | D | E
R_1Offending dependency
B | D
R_2A | B | C | E
R_3
Foreign Keyey
©2001 Irwin Levinstein
Curing Partial Dependency
A | B | C | D | E
R_1Offending dependency
ππππB,DB,DB,DB,D(R_1)(R_1)(R_1)(R_1)
B | D
R_2A | B | C | E
R_3
Foreign Keyey
©2001 Irwin Levinstein
Curing Partial Dependency
A | B | C | D | E
R_1Offending dependency
ππππB,DB,DB,DB,D(R_1)(R_1)(R_1)(R_1)ππππA,B,C,EA,B,C,EA,B,C,EA,B,C,E(R_1)(R_1)(R_1)(R_1)
B | D
R_2A | B | C | E
R_3
Foreign Keyey
©2001 Irwin Levinstein
Curing Partial Dependency
A | B | C | D | E
R_1Offending dependency
ππππB,DB,DB,DB,D(R_1)(R_1)(R_1)(R_1)ππππA,B,C,EA,B,C,EA,B,C,EA,B,C,E(R_1)(R_1)(R_1)(R_1)
Key is LHS of offending dep.
B | D
R_2A | B | C | E
R_3
Foreign Keyey
©2001 Irwin Levinstein
Curing Partial Dependency
A | B | C | D | E
R_1Offending dependency
ππππB,DB,DB,DB,D(R_1)(R_1)(R_1)(R_1)ππππA,B,C,EA,B,C,EA,B,C,EA,B,C,E(R_1)(R_1)(R_1)(R_1)
Key is LHS of offending dep.
B | D
R_2A | B | C | E
R_3
Foreign Keyey
©2001 Irwin Levinstein
Retrieving R_1
A | B | C | E
R_3
B | D
R_2
©2001 Irwin Levinstein
Retrieving R_1
A | B | C | E
R_3
B | D
R_2
R_3 �(B),(B)R_2
©2001 Irwin Levinstein
Retrieving R_1
A | B | C | E
R_3
B | D
R_2
R_3 �(B),(B)R_2
A | B | C | D | E
R_1
©2001 Irwin Levinstein
2nd 2NF ExampleSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
©2001 Irwin Levinstein
2nd 2NF ExampleSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
Note Redundancies
©2001 Irwin Levinstein
2nd 2NF ExampleSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
Note Redundancies
©2001 Irwin Levinstein
2nd 2NF ExampleSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
Note Redundancies
©2001 Irwin Levinstein
2nd 2NF ExampleSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
Note Redundancies
©2001 Irwin Levinstein
2nd 2NF ExampleSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
Note Redundancies
©2001 Irwin Levinstein
2nd 2NF ExampleSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
Note Redundancies
Many opportunities for anomalies
©2001 Irwin Levinstein
2nd 2NF ExampleSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
Note Redundancies
Many opportunities for anomalies
Redundancies due to partial dependencies
©2001 Irwin Levinstein
Functional DependenciesSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
Key
©2001 Irwin Levinstein
Functional DependenciesSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
SSN,Pno → Hours
Key
©2001 Irwin Levinstein
Functional DependenciesSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
SSN,Pno → Hours
SSN → Ename
Key
©2001 Irwin Levinstein
Functional DependenciesSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
SSN,Pno → Hours
SSN → EnamePno → Pname,Ploc
Key
©2001 Irwin Levinstein
Functional DependenciesSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
SSN,Pno → Hours
SSN → EnamePno → Pname,Ploc
Key
©2001 Irwin Levinstein
Functional DependenciesSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
SSN,Pno → Hours
SSN → EnamePno → Pname,PlocPartial
Dependency
Key
©2001 Irwin Levinstein
Functional DependenciesSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
SSN,Pno → Hours
SSN → EnamePno → Pname,PlocPartial
Dependency
Key
©2001 Irwin Levinstein
Curing Emp_ProjSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
SSN | ENAMESSN | ENAMESSN | ENAMESSN | ENAME123 Smith666 Narayan453 English333 Wong
EMPEMPEMPEMPSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOC123 1 32.5 ProdX Bell 123 2 7.5 ProdY Suga 666 3 40.0 ProdZ Hous 453 1 20.0 ProdX Bell 453 2 20.0 ProdY Suga 333 2 10.0 ProdY Suga 333 3 10.0 ProdZ Hous 333 10 10.0 Compu Staf
EMP_PROJ1EMP_PROJ1EMP_PROJ1EMP_PROJ1
©2001 Irwin Levinstein
Curing Emp_ProjSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
SSN → Ename
SSN | ENAMESSN | ENAMESSN | ENAMESSN | ENAME123 Smith666 Narayan453 English333 Wong
EMPEMPEMPEMPSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOC123 1 32.5 ProdX Bell 123 2 7.5 ProdY Suga 666 3 40.0 ProdZ Hous 453 1 20.0 ProdX Bell 453 2 20.0 ProdY Suga 333 2 10.0 ProdY Suga 333 3 10.0 ProdZ Hous 333 10 10.0 Compu Staf
EMP_PROJ1EMP_PROJ1EMP_PROJ1EMP_PROJ1
©2001 Irwin Levinstein
Curing Emp_ProjSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
SSN → Ename
ππππssn,ssn,ssn,ssn,enameenameenameename(EMP_PROJ)(EMP_PROJ)(EMP_PROJ)(EMP_PROJ)
SSN | ENAMESSN | ENAMESSN | ENAMESSN | ENAME123 Smith666 Narayan453 English333 Wong
EMPEMPEMPEMPSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOC123 1 32.5 ProdX Bell 123 2 7.5 ProdY Suga 666 3 40.0 ProdZ Hous 453 1 20.0 ProdX Bell 453 2 20.0 ProdY Suga 333 2 10.0 ProdY Suga 333 3 10.0 ProdZ Hous 333 10 10.0 Compu Staf
EMP_PROJ1EMP_PROJ1EMP_PROJ1EMP_PROJ1
©2001 Irwin Levinstein
Curing Emp_ProjSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC123 1 32.5 Smith ProdX Bell 123 2 7.5 Smith ProdY Suga 666 3 40.0 Narayan ProdZ Hous 453 1 20.0 English ProdX Bell 453 2 20.0 English ProdY Suga 333 2 10.0 Wong ProdY Suga 333 3 10.0 Wong ProdZ Hous 333 10 10.0 Wong Compu Staf
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
SSN → Ename
ππππssn,ssn,ssn,ssn,enameenameenameename(EMP_PROJ)(EMP_PROJ)(EMP_PROJ)(EMP_PROJ)
ππππssn,pno,hours,ssn,pno,hours,ssn,pno,hours,ssn,pno,hours,pnamepnamepnamepname,,,,plocplocplocploc(EMP_PROJ)(EMP_PROJ)(EMP_PROJ)(EMP_PROJ)
SSN | ENAMESSN | ENAMESSN | ENAMESSN | ENAME123 Smith666 Narayan453 English333 Wong
EMPEMPEMPEMPSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOC123 1 32.5 ProdX Bell 123 2 7.5 ProdY Suga 666 3 40.0 ProdZ Hous 453 1 20.0 ProdX Bell 453 2 20.0 ProdY Suga 333 2 10.0 ProdY Suga 333 3 10.0 ProdZ Hous 333 10 10.0 Compu Staf
EMP_PROJ1EMP_PROJ1EMP_PROJ1EMP_PROJ1
©2001 Irwin Levinstein
Curing Emp_Proj1SSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOC123 1 32.5 ProdX Bell 123 2 7.5 ProdY Suga 666 3 40.0 ProdZ Hous 453 1 20.0 ProdX Bell 453 2 20.0 ProdY Suga 333 2 10.0 ProdY Suga 333 3 10.0 ProdZ Hous 333 10 10.0 Compu Staf
EMP_PROJ1EMP_PROJ1EMP_PROJ1EMP_PROJ1
PNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOC1 ProdX Bell 2 ProdY Suga 3 ProdZ Hous 10 Compu Staf
PROJPROJPROJPROJ
SSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURS123 1 32.5123 2 7.5666 3 40.0453 1 20.0453 2 20.0333 2 10.0333 3 10.0333 10 10.0
EMP_PROJ2EMP_PROJ2EMP_PROJ2EMP_PROJ2
©2001 Irwin Levinstein
Curing Emp_Proj1SSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOC123 1 32.5 ProdX Bell 123 2 7.5 ProdY Suga 666 3 40.0 ProdZ Hous 453 1 20.0 ProdX Bell 453 2 20.0 ProdY Suga 333 2 10.0 ProdY Suga 333 3 10.0 ProdZ Hous 333 10 10.0 Compu Staf
EMP_PROJ1EMP_PROJ1EMP_PROJ1EMP_PROJ1
Pno → Pname,Ploc
PNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOC1 ProdX Bell 2 ProdY Suga 3 ProdZ Hous 10 Compu Staf
PROJPROJPROJPROJ
SSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURS123 1 32.5123 2 7.5666 3 40.0453 1 20.0453 2 20.0333 2 10.0333 3 10.0333 10 10.0
EMP_PROJ2EMP_PROJ2EMP_PROJ2EMP_PROJ2
©2001 Irwin Levinstein
Curing Emp_Proj1SSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOC123 1 32.5 ProdX Bell 123 2 7.5 ProdY Suga 666 3 40.0 ProdZ Hous 453 1 20.0 ProdX Bell 453 2 20.0 ProdY Suga 333 2 10.0 ProdY Suga 333 3 10.0 ProdZ Hous 333 10 10.0 Compu Staf
EMP_PROJ1EMP_PROJ1EMP_PROJ1EMP_PROJ1
Pno → Pname,Ploc
ππππpno,pno,pno,pno,pnamepnamepnamepname,,,,plocplocplocploc(EMP_PROJ)(EMP_PROJ)(EMP_PROJ)(EMP_PROJ)
PNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOC1 ProdX Bell 2 ProdY Suga 3 ProdZ Hous 10 Compu Staf
PROJPROJPROJPROJ
SSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURS123 1 32.5123 2 7.5666 3 40.0453 1 20.0453 2 20.0333 2 10.0333 3 10.0333 10 10.0
EMP_PROJ2EMP_PROJ2EMP_PROJ2EMP_PROJ2
©2001 Irwin Levinstein
Curing Emp_Proj1SSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOCSSN | PNO | HOURS | PNAME | PLOC123 1 32.5 ProdX Bell 123 2 7.5 ProdY Suga 666 3 40.0 ProdZ Hous 453 1 20.0 ProdX Bell 453 2 20.0 ProdY Suga 333 2 10.0 ProdY Suga 333 3 10.0 ProdZ Hous 333 10 10.0 Compu Staf
EMP_PROJ1EMP_PROJ1EMP_PROJ1EMP_PROJ1
Pno → Pname,Ploc
ππππpno,pno,pno,pno,pnamepnamepnamepname,,,,plocplocplocploc(EMP_PROJ)(EMP_PROJ)(EMP_PROJ)(EMP_PROJ)
ππππssn,pno,hoursssn,pno,hoursssn,pno,hoursssn,pno,hours(EMP_PROJ1)(EMP_PROJ1)(EMP_PROJ1)(EMP_PROJ1)PNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOC1 ProdX Bell 2 ProdY Suga 3 ProdZ Hous 10 Compu Staf
PROJPROJPROJPROJ
SSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURS123 1 32.5123 2 7.5666 3 40.0453 1 20.0453 2 20.0333 2 10.0333 3 10.0333 10 10.0
EMP_PROJ2EMP_PROJ2EMP_PROJ2EMP_PROJ2
©2001 Irwin Levinstein
Retrieving Emp_Proj
PNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOC1 ProdX Bell 2 ProdY Suga 3 ProdZ Hous 10 Compu Staf
PROJPROJPROJPROJ
SSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURS123 1 32.5123 2 7.5666 3 40.0453 1 20.0453 2 20.0333 2 10.0333 3 10.0333 10 10.0
EMP_PROJ2EMP_PROJ2EMP_PROJ2EMP_PROJ2
SSN | ENAMESSN | ENAMESSN | ENAMESSN | ENAME123 Smith666 Narayan453 English333 Wong
EMPEMPEMPEMP
SSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
©2001 Irwin Levinstein
Retrieving Emp_Proj
PNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOC1 ProdX Bell 2 ProdY Suga 3 ProdZ Hous 10 Compu Staf
PROJPROJPROJPROJ
SSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURS123 1 32.5123 2 7.5666 3 40.0453 1 20.0453 2 20.0333 2 10.0333 3 10.0333 10 10.0
EMP_PROJ2EMP_PROJ2EMP_PROJ2EMP_PROJ2
SSN | ENAMESSN | ENAMESSN | ENAMESSN | ENAME123 Smith666 Narayan453 English333 Wong
EMPEMPEMPEMP
Pno → Pname,Ploc
SSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
©2001 Irwin Levinstein
Retrieving Emp_Proj
PNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOC1 ProdX Bell 2 ProdY Suga 3 ProdZ Hous 10 Compu Staf
PROJPROJPROJPROJ
SSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURS123 1 32.5123 2 7.5666 3 40.0453 1 20.0453 2 20.0333 2 10.0333 3 10.0333 10 10.0
EMP_PROJ2EMP_PROJ2EMP_PROJ2EMP_PROJ2
SSN | ENAMESSN | ENAMESSN | ENAMESSN | ENAME123 Smith666 Narayan453 English333 Wong
EMPEMPEMPEMP
Pno → Pname,Ploc SSN → Ename
SSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
©2001 Irwin Levinstein
Retrieving Emp_Proj
PNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOC1 ProdX Bell 2 ProdY Suga 3 ProdZ Hous 10 Compu Staf
PROJPROJPROJPROJ
SSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURS123 1 32.5123 2 7.5666 3 40.0453 1 20.0453 2 20.0333 2 10.0333 3 10.0333 10 10.0
EMP_PROJ2EMP_PROJ2EMP_PROJ2EMP_PROJ2
SSN | ENAMESSN | ENAMESSN | ENAMESSN | ENAME123 Smith666 Narayan453 English333 Wong
EMPEMPEMPEMP
Pno → Pname,Ploc SSN → Ename
SSN,Pno → Hours
SSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
©2001 Irwin Levinstein
Retrieving Emp_Proj
PNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOCPNO | PNAME | PLOC1 ProdX Bell 2 ProdY Suga 3 ProdZ Hous 10 Compu Staf
PROJPROJPROJPROJ
SSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURSSSN | PNO | HOURS123 1 32.5123 2 7.5666 3 40.0453 1 20.0453 2 20.0333 2 10.0333 3 10.0333 10 10.0
EMP_PROJ2EMP_PROJ2EMP_PROJ2EMP_PROJ2
SSN | ENAMESSN | ENAMESSN | ENAMESSN | ENAME123 Smith666 Narayan453 English333 Wong
EMPEMPEMPEMP
Pno → Pname,Ploc SSN → Ename
SSN,Pno → Hours
(EMP_PROJ2 �(pno),(pno)PROJ) �(ssn),(ssn)EMP
SSN,Pno → Hours
SSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOCSSN | PNO | HOURS | ENAME | PNAME | PLOC
EMP_PROJEMP_PROJEMP_PROJEMP_PROJ
![EL302A - syg.com.cn · Prj FOIF 123 4 123 Prj FOIF 1. 2. 3. 4. 5. 123 1. 2. / 3. 4. 5. 123 HD:12.345m 123 MEAS SNo:001 [B]F Z: 3.000m 1 2 MEAS 123](https://static.fdocuments.net/doc/165x107/603bbdf32fc33e7f48187731/el302a-sygcomcn-prj-foif-123-4-123-prj-foif-1-2-3-4-5-123-1-2-3-4.jpg)
