Query Optimization Practice
Schema
create table T(
t_id int not null primary key,
g int,
h int,
t_filler varchar)
create table S(
s_id int not null primary key,
d int,
e int,
f int,
t_id int references T,
s_filler varchar)
create table R(
r_id int not null primary key,
a int,
b int,
c int,
s_id int references S,
r_filler varchar)
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