HJ

Leave HJ’s trace, All-In

[SQL First Step] 28. Index Structure

Index and its data structure, binary tree

[SQL First Step] 27. Constraints

Constraints, Primary key

[SQL First Step] 26. Table Create, Delete, and Change

Table Creating, Deleting and Changing Columns

[SQL First Step] 25. Database Object

Database object, Schema

[SQL First Step] 24. Correlated Subquery

EXISTS, Correlated Subquery, IN