[单选]
The CUSTOMERS table has these columns:
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)
Which statement finds the rows in the CUSTOMERS table that do not have a postal code? （）

A . SELECT customer_id, customer_name FROM customers WHERE postal_code CONTAINS NULL;
B . SELECT customer_id, customer_name FROM customers WHER postal_code = ' ___________';
C . SELECT customer_id, customer_name FROM customers WHERE postal _ code IS NULL;
D . SELECT customer_id, customer_name FROM customers WHERE postal code IS NVL;
E . SELECT customer_id, customer_name FROM customers WHERE postal_code = NULL

10kY及以下用户供电电压允许变化范围是（）。 ±1％。 ±3％。 ±5％。 ±7％。 The SPFILE for the PROD database specifies the following initialization parameter values： SGA_TARGET = 2G DB_8K_CACHE_SIZE = 128M You create a tablespace named HR with the non-standard block size of 8K. Four database users are running queries on a table in the HR tablespace. These users complain that the queries are taking longer than usual to complete. While investigating the reasons for this delay， you discover that the database encounters extensive cache misses on the database buffer cache with the block size of 8K. You issue the following statement to increase the value of the DB_8K_CACHE_SIZE initialization parameter to 256M： SQL>ALTER SYSTEM SET DB_8K_CACHE_SIZE=256M SCOPE = BOTH； What is the result of this statement？（） The statement fails because you cannot set the memory components manually if the SGA_TARGET initialization parameter is set to a nonzero value.。 The statement fails because the DB_8K_CACHE_SIZE initialization parameter is not a dynamic parameter.。 The statement increases the value of the DB_8K_CACHE_SIZE initialization parameter to 256M and extracts an additional 128M of memory from the automatically sized memory components.。 The statement increases the value of the DB_8K_CACHE_SIZE initialization parameter to 256M and reallocates an additional 128M memory from the memory components that are not auto-tuned.。工程变更可由施工单位提出也可由建设单位提出，无论哪方提出都应履行完善手续。施工单位在收到（）发出的变更指示后，应向监理单位提交变更报价书。承包人。监理单位。项目经理。监理工程师。幼儿园公共关系建构的特征有（）情感性。双向性。广泛性。整体性。复励直流电机的励磁绕组和电枢绕组是（）。串联。并联。单独分开连接。一部分串联其他的并联。

The CUSTOMERS table has these columns:
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)
Which statement finds the rows in the CUSTOMERS table that do not have a postal code? （）

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