原创 RadHat搭建內網YUM源服務器
前言：隨着內網linux服務器越來越多，在每臺服務器上安裝軟件，都要先把安裝盤上傳上去，在配置本地yum服務，即麻煩又費時。可以在內網的一臺linux服務器上安裝yum服務，然後其他服務器直接修改repo文件使用yum服務就可以了。安裝步
2020-06-20 15:47:25
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原创 OCP-1Z0-051-題目解析-第46題
46. Which statements are correct regarding indexes? (Choose all that apply.) A. When a table is dropped, the correspon
2020-06-20 13:27:45
原创 OCP-1Z0-051-題目解析-第30題
30. Evaluate the following CREATE TABLE commands: CREATE TABLE orders (ord_no NUMBER(2) CONSTRAINT ord_pk PRIMARY KEY,
2020-06-20 13:27:45
原创 OCP-1Z0-051-題目解析-第38題
38. Which two statements are true regarding views? (Choose two.) A. A simple view in which column aliases have been us
2020-02-22 22:19:53
原创 OCP-1Z0-051-題目解析-第31題
31. Evaluate the following SQL commands: SQL>CREATE SEQUENCE ord_seq INCREMENT BY 10 START WITH 120 MAXV
2020-02-22 22:19:53
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原创 OCP-1Z0-051-題目解析-第41題
41. Which two statements are true regarding views? (Choose two.) A. A subquery that defines a view cannot include the
2020-02-22 22:19:53
原创 OCP-1Z0-051-題目解析-第42題
42. Which three statements are true regarding views? (Choose three.) A. Views can be created only from tables. B. Vie
2020-02-22 22:19:53
原创 OCP-1Z0-051-題目解析-第43題
43. Evaluate the following CREATE SEQUENCE statement: CREATE SEQUENCE seq1 START WITH 100 INCREMENT BY 10 MAXVALUE
2020-02-22 22:19:53
原创 OCP-1Z0-051-題目解析-第40題
40. View the Exhibit to examine the description for the SALES and PRODUCTS tables. You want to create a SALE_PROD view
2020-02-22 22:19:53
原创 OCP-1Z0-051-題目解析-第39題
39. Evaluate the following command: CREATE TABLE employees (employee_id NUMBER(2) PRIMARY KEY, last_name
2020-02-22 22:19:53
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原创 OCP-1Z0-051-題目解析-第32題
32. Which CREATE TABLE statement is valid? A. CREATE TABLE ord_details (ord_no NUMBER(2) PRIMARY KEY, item_
2020-02-22 22:19:53
原创 OCP-1Z0-051-題目解析-第34題
34. You created an ORDERS table with the following description: name Null Type ORD_ID
2020-02-22 22:19:53
原创 OCP-1Z0-051-題目解析-第35題
35. Which two statements are true regarding constraints? (Choose two.) A. A table can have only one primary key and on
2020-02-22 22:19:53
原创 OCP-1Z0-051-題目解析-第37題
37. You issued the following command to drop the PRODUCTS table: SQL> DROP TABLE products; What is the implication of
2020-02-22 22:19:53
原创 OCP-1Z0-051-題目解析-第36題
36. Examine the following SQL commands: SQL>CREATE TABLE products ( prod_id NUMBER(3) CONSTRAINT p_ck CHECK (prod_id
2020-02-22 22:19:53