T.I.L_230202

What’s New for Today

1. Algorithm
   • 1256
     • tree
     • recursion
   • 1309
     • sort
     • data structure
2. JPA 활용
   • recap
     • return entity
     • return Dto
     • return Dto + collection fetch join
   • batch fetch
     • using batch fetch to apply paging
     • fetch join vs lazy loading + batch fetch