HJ

Leave HJ’s trace, All-In

[SQL First Step] 31. Set Operations

UNION

[SQL First Step] 30. Creating and Deleting View

View

[SQL First Step] 29. Index Creation and Deletion

Creating and deleting index

[SQL First Step] 28. Index Structure

Index and its data structure, binary tree

[SQL First Step] 27. Constraints

Constraints, Primary key