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Examine the description of the CUSTOMERS table:
CUSTOMER_ID NUMBER(4) NOT NULL
CUSTOMER_NAME VARCHAR2(100) NOT NULL
STREET_ADDRESS VARCHAR2(150)
CITY_ADDRESS VARCHAR2(50)
STATE_ADDRESS VARCHAR2(50)
PROVINCE_ADDRESS VARCHAR2(50)
COUNTRY_ADDRESS VARCHAR2(50)
POSTAL_CODE VARCHAR2(12)
CUSTOMER_PHONE VARCHAR2(20)
The CUSTOMER_ID column is the primary key for the table.
Which statement returns the city address and the number of customers in the cities Los Angeles or San Francisco?（）

A . SELECT city_address, COUNT(*) FROM customers WHERE city _ address IN ('Los Angeles','San Fransisco');
B . SELECT city_address, COUNT (*) FROM customers WHERE city address IN ( 'Los Angeles', 'San Fransisco') GROUP BY city_address;
C . SELECT city_address, COUNT(customer_id) FROM customers WHERE city_address IN ( 'Los Angeles', 'San Fransisco') GROUP BY city_address, customer_ id;
D . SELECT city_address, COUNT (customer_id) FROM customers GROUP BY city_ address IN ('Los Angeles','San Fransisco')

充装人员应根据（）随时调整秤砣的位置。充装量；。充装压力；。钢瓶自重。 Your Oracle Database 10g is online when you execute the following statement： SQL>ALTER TABLESPACE MY_TABLESPACE FLASHBACK OFF； What is the result of executing this statement if the Flashback Database feature is already enabled in the database？（） The database does not record flashback logs for MY_TABLESPACE。 The tables residing in MY_TABLESPACE are not protected by the Recycle Bin.。 All the tablespaces except MY_TABLESPACE can be recovered using Flashback Database feature.。 None of the flashback technologies， such as Flashback Table， Flashback Transaction Query and Flashback Version Query can be used to recover individual rows within the objects from MY_TABLESPACE。其他中型水库和影响县城安全或坝高（）m以上小型水库的大坝安全评价由具有水利水电勘测设计乙级以上（含乙级）资质的单位承担。 10。 20。 30。 40。 The ORACLE_SID environment variable is set to +ASM. ASMLIB is not used in the configuration. You executed the following command to startup the Automatic Storage Management （ASM） instance. SQL> STARTUP； Which two activities are performed during a successful start up operation？（） The databases configured to use the ASM instance are mounted。 The disk groups are mounted as per the ASM_DISKGROUPS initialization parameter。 ASM starts the Oracle Cluster Synchronization Services （CSS） daemon if it is not started 。 ASM discovers and examines the contents of all files that are in the paths specified in the ASM_DISKGROUPS initialization parameter。土质路堤填筑时，涵顶面填土压实厚度大于（）时，方可允许重型机械和汽车通行。 20cm。 30cm。 40cm。 50cm。

Examine the description of the CUSTOMERS table:
CUSTOMER_ID NUMBER(4) NOT NULL
CUSTOMER_NAME VARCHAR2(100) NOT NULL
STREET_ADDRESS VARCHAR2(150)
CITY_ADDRESS VARCHAR2(50)
STATE_ADDRESS VARCHAR2(50)
PROVINCE_ADDRESS VARCHAR2(50)
COUNTRY_ADDRESS VARCHAR2(50)
POSTAL_CODE VARCHAR2(12)
CUSTOMER_PHONE VARCHAR2(20)
The CUSTOMER_ID column is the primary key for the table.
Which statement returns the city address and the number of customers in the cities Los Angeles or San Francisco?（）

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