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List the characteristics that a table must have to be considered a relation. List two synonyms...

  1. List the characteristics that a table must have to be considered a relation.
  2. List two synonyms for “file,” two for “record,” and two for “field.”
  3. What are the four uses of a primary key?
  4. What are the desirable characteristics of a primary key?
  5. What is a surrogate key and when do you use them?
  6. What is a foreign key?
  7. What is referential integrity and why is it important?
  8. What are the three possible interpretations of a null value?
  9. What is normalization? Why is it important?
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puimay ke Primary Key is maiDly designed to ideo tbe records uhiquely can be applied to oe or More To creoe a foreignke ie refereohoJ value i --the-Column__ having. a .pri may Dara coosiseocy ismcintained wna is foreign key? forei key is a colum a ROMS io Qootber table ce to Primar key . _Some like tprary key foreigo caDleo be opplied to more tban one Colcm2 atable oren key ild table candidate. Key Pri Ory-, table

the value N s tis field completely unknoan a blaok Or zero vaue O Data dloe nomach for be type CF thedata io tha colum oqif e able s related to customers Of busioess an busioess bo Sex feit field COnfaio value . ⑤ Data value, is unknooD Coo oosoq for sure G.q what isnormali20hoW of Tesult why is i importont The proces of Srucurn dojo base io a oormal forms to reduce the redundeocy C repeatooo) ofF Dlota ood to prove doło legry florrwoJahonoportaot because 파 al I ous data, retri e volal minimum time 2.simplifies dota majolainance 3 Réduce tbe resracturinq of table 4. Makes tbe database、more. informative

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