单项选择题
A.Once created, a sequence belongs to a specific schema.
B.Once created, a sequence is linked to a specific table.
C.Once created, a sequence is automatically available to all users.
D.Only the DBA can control which sequence is used by a certain table.
E.Once created, a sequence is automatically used in all INSERT and UPDATE statements.
多项选择题 Which two are true about aggregate functions? （）
单项选择题 Evaluate the SQL statement: SELECT LPAD(salary,10,*) FROM EMP WHERE EMP_ID = 1001; If the employee with the EMP_ID 1001 has a salary of 17000, what is displayed?（）
单项选择题 The EMPLOYEES table contains these columns: EMPLOYEE_ID NUMBER(4) LAST_NAME VARCHAR2 (25) JOB_ID VARCHAR2(10) You want to search for strings that contain SA_ in the JOB_ID column. Which SQL statement do you use?（）