16.3 Parser to Logical Query Plans

16.1. SQL(not RAE) Figure 16.2 select distinct movietitle from starsIn where starname in (select name from moviestar where birthdate like '%1974%'); NOTRAE=Relational Algebra NOT Expressible SQL

16.3. SQL/RAE of Figure select distinct movietitle from starsIn a, (select name from moviestar where birthdate like '%1974%') temp where a.starname = temp.name; RAE=Relational Algebra Expressible SQL

16.3Example16.19 Figure π movie title σ movieYear lile ‘%1974’ StarsIn This is the RAE SQL π name MovieStar  starname=name

16.3. SQL/RAE of Figure select movietitle from (select starname,movietitle From starsIn) a, (select name from moviestar where birthdate like '%1974%') b where a.starname = b.name;

16.3Example16.19 Figure π movie title σ movieYear lile ‘%1974%’ StarsIn This is the RAE SQL π name MovieStar  starname=name  starame, movie title

SQL in Figure Select distinct m1.movieTitle, m1.movieYear From StarsIn m1 Where m1.movieYear - 40 <= ( Select AVG(birthdate) From StarsIn m2, Moviestar s Where m2.starName=s.name AND m1.movieTitle = m2.movieTitle AND m1.movieyear = m2.movieyear );

SQL in Figure Select distinct m.movieTitle, m.movieYear From StarsIn m1, ( Select m2.movieTitle, m2.movieyear, AVG(birthdate) as ave From StarsIn m2, Moviestar s Where m2.starName=s.name Group by m2.movieTitle, m2.movieyear ) m Where m1.movieTitle = m.movieTitle and m1.movieYear - 40 <=ave;

γ m2.movieTitle, m2.movieyear,AVG(birthDate)  ave  m2.movietitle=m1.movietitle and m2.movietitle=m1.movietitle  m1.movieYear -40  abd π m1.movieYear m1.movieYear  StarsIn  m2,starname=s.name StaesIn MovieStar

γ m2.movieTitle, m2.movieyear,AVG(birthDate)  ave  m2.movietitle=m1.movietitle and m2.movietitle=m1.movietitle  m1.movieYear -40  abd π m1.movieYear m1.movieYear  StarsIn  m2,starname=s.name StaesIn MovieStar π m1.movieYear,m1.movieYear

γ m2.movieTitle, m2.movieyear,AVG(birthDate)  ave  m1.movieYear -40  abd π m1.movieYear m1.movieYear   m2,starname=s.name StaesIn MovieStar

γ m2.movieTitle, m2.movieyear,AVG(birthDate)  ave  m1.movieYear -40  abd π m1.movietitle m1.movieYear   m2,starname=s.name StaesIn MovieStar  m1.movietitle m1.movieYear

Lecture on Whiteboard Select P.PNAME, Sum (S.QTY) From Parts P, Shipments S Where P.PNUM = S.SNUM Group by PNAME;

Lecture on Whiteboard  pname,SUM(qty) -->sum  (Natural Join) Shipments Parts  pname,SUM(qty) -->sum (Shipment  Parts)

Lecture on Whiteboard Select F.PNAME, Sum (F.QTY) as sum From ( Select PNAME, QTY FROM ( SELECT PNUM,PNAME From Parts) P, ( Select PNUM, QTY From Shipments) S where P.PNUM=S.PNUM )F Group by F.pname;

 pname,SUM(qty) -->sum   pname. qty   (Natural join)   π pnum,qty π pnum, pname  Shipments Parts