単一のデータ操作言語 (DML) ステートメントを使用して実行できるタスクはどれですか?

Examine the commands used to create DEPARTMENT_DETAILSand COURSE_DETAILS tables:

You want to generate a list of all department IDs along with any course IDs that may have been assigned to them.
Which SQL statement must you use?

Examine the description of the EMPLOYEES table:

Which statement will execute successfully, returning distinct employees with non-null first names?

Examine the structure of the MEMBERStable:
Name Null? Type
------------------ --------------- ------------------------------
MEMBER_ID NOT NULL VARCHAR2 (6)
FIRST_NAME VARCHAR2 (50)
LAST_NAME NOT NULL VARCHAR2 (50)
ADDRESS VARCHAR2 (50)
You execute the SQL statement:
SQL > SELECT member_id, ' ' , first_name, ' ' , last_name "ID FIRSTNAME LASTNAME
" FROM members;
What is the outcome?

Examine the structure of the BOOKS_TRANSACTIONStable.

You want to update this table such that BOOK_IDis set to 'INVALID'for all rows where no MEMBER_ID has been entered.
Examine this partial SQL statement:

Which condition must be used in the WHEREclause to perform the required update?
MEMBER_ID = '';