Practice 37. Creating a Customized Sort Order [1]

Practice 36. Conditionally Updating a Table [1]

Practice 35. Summary Report

Practice 34. Overlaying Missing Data Values [2]

Practice 33. Counting Duplicate Rows in a Table

Practice 32. Comparing SAS 데이터셋

Practice 31. SQL 실습(1)

Practice 30. SQL 서브쿼리(Having절)

Practice 29. SQL 서브쿼리(In-Line) [1]

Practice 28. SQL 서브쿼리