Examine the data in the EMPLOYEES and EMP_HIST tables:The EMP_HIST table is updated at the end of every year. The employee ID, name, job ID, and salary of each existing employee are modified with the latest data. New employee details are added to the tabl

题目

Examine the data in the EMPLOYEES and EMP_HIST tables:The EMP_HIST table is updated at the end of every year. The employee ID, name, job ID, and salary of each existing employee are modified with the latest data. New employee details are added to the table.Which statement accomplishes this task?（）

A.

B.

C.

D.

相似考题

1.I think the door is locked. But I'll go and ().A、checkB、examine

2.You examine the output of SHOW GLOBAL STATUS and notice that the value of Created_tmp_disk_tables is consistently increasing.Which two variables would likely fix this issue?()A.Table_open_cacheB.Table_open_cache_instancsC.Table_definition_cacheD.Tmp_table_sizeE.Max_heap_table_sizeF.Max_tmp_tables

3.You want to start monitoring statistics on the distribution of storage engines that are being used and the average sizes of tables in the various databases.Some details are as follows:The Mysql instance has 400 databases. Each database on an average consists of 25-50 tables. You use the query:SELECT TABLE_SCHEMA, ‘ENGINE‘, COUNT (*), SUM(data_length) total_size FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE= ‘BASE TABLE‘ GROUP BY TABLE_SCHEMA, ‘ENGINE‘ ;Why is this query slow to execute?（）A.Collecting information requires large numbers of locks on various INFORMATION_SCHEMA tablesB.Aggregating details from various storage engine caches for the final output is time consumingC.Collecting information requires various disk-level operations and is time consumingD.Counting and summarizing all table pages in the InnoDB shared tablespace is time consuming

4.You added a PHONE_NUMBER column of NUMBER data type to an existing EMPLOYEES table. The EMPLOYEES table already contains records of 100 employees. Now, you want to enter the phone numbers of each of the 100 employees into the table. Some of the employees may not have a phone number available. Which data manipulation operation do you perform? （）A. MERGEB. INSERTC. UPDATED. ADDE. ENTERF. You cannot enter the phone numbers for the existing employee records.

更多“Examine the data in the EMPLOYEES and EMP_HIST tables:The EMP_HIST table is updated at the ”相关问题

  • 第1题：

    After __________ (examine) the lady, the doctor suggested that his back was badly hurt in the accident.


    参考答案：being examined

  • 第2题：

    Examinethestatement:SQL>CREATETABLESPACEuser_data2>EXTENTMANAGEMENTLOCAL3>SEGMENTSPACEMANAGEMENTAUTO;Whichtwpassumptionsmustbetrueforthisstatementtoexecutesuccessfully?()

    A.OracleManagedFilesareusedforthisinstance.

    B.TheUSER_DATAtablespaceismanagedusingFET$/UET$tables.

    C.TheCOMPATIBLEinitializationparametermustbe9.0.0orhigher.

    D.SpacewithinsegmentsintheUSER_DATAtablespaceismanagedwithfreelists.


    参考答案：A, C

  • 第3题：

    He rolled up his trouer leg to exhibit his wounded knee.

    A:spread
    B:open
    C:show
    D:examine

    答案：C
    解析：
    本句意思：他卷起他的裤腿来显露受伤的膝盖。exhibit展示，显示。spread伸开，展开；open打开；show展示，出示；examine检查。

  • 第4题：

    检查

    A.expect

    B.except

    C.excuse

    D.examine


    正确答案：D

  • 第5题：

    Most operating systems have a standard set of ( ) to handle the processing of all input and output instructions.

    A.spreadsheet
    B.control instructions
    C. I/O operation
    D.datA.table

    答案：B
    解析：
    翻译：

    大多数操作系统都有一套标准的（71）处理所有的输入和输出指令。

    A. 电子表格 B. 控制指令

    C. I/O操作 D. 数据表

  • 第6题：

    已知变量ds 引用某个DataSet 对象，该DataSet 对象中已包含一个表名为“table1”的数据表。在Windows 窗体Form1 中，为了将变量名为dgvData 的DataGridView 控件绑定到数据表“table1”，可以使用代码（）。

    A．dgvData.DataSource = ds; dgvData.DataMember = ds.Tables["table1"];

    B．dgvData.DataMember = ds;

    C．dgvData.DataSource = new DataView(ds.Tables["table1"]);

    D．dgvData.DataSource = ds.Tables["table1"]; dgvData.DataMember = ds;


    da.Fill(ds, table1)

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