☰
$
cd ../lessons
xp
0
# lessons
close
# advanced
01
Recursive CTEs
02
PIVOT · Rotating Data
>
03
Query Optimization
04
Real-World SQL Patterns
⤓ download notes (.md)
~
/
lessons
/
advanced
/
query-optimization
[challenge]
lesson 41
Query Optimization
>
theory
examples
[2]
challenges
[0/3]
loading company.db…
← prev:
PIVOT · Rotating Data
next:
Real-World SQL Patterns
→
$
tools
▸