The database master helps to play 50 points 50

SQL consists of a, b, and c.

Options: a. Data definition.

b. Data Manipulation.

c. Data control.

d. Regulations on the use of embedded SQL.

The basis of database recovery is to take advantage of the redundant data that is dumped, which refers to b,d

Options: a. Data Dictionary.

b. Documents generated during the development of the database system.

c. Log files.

d. Backup copy of the database.

What data inconsistencies will be brought about by concurrent operations A option: a. Lost modifications.

b. It cannot be read repeatedly.

c. Read dirty data.

d. Deadlock Possible failures in the database system that do not destroy the database are d, a.

Options: a. Operational failure.

b. Transaction failure.

c. System failure.

d. Medium failure.

In the narrative about the operation and maintenance of the database, the error is the c,d option: a. As long as the database is officially put into operation, it marks the end of the database design work B. The maintenance work of the database is to maintain the normal operation of the database system C. The maintenance work of the database is to find errors, and the modification error D. The official operation of the database marks the beginning of the operation and maintenance of the database The blockade of database objects may cause the problem of live locks and deadlocks, and the methods commonly used to prevent deadlocks are AD.

Options: a. One-time blockade method.

b. Sequential blockade method.

c. Two-stage blockade law.

d. Serialized scheduling method.

After connecting to the database, you need to be able to add, modify, and delete tables, views, etc., and you must be able to query, add, delete, and modify the records of the database.

There is no doubt that SPSS can summarize, count, and analyze complex data, but do you want to analyze these data together, or do you want to open multiple windows to analyze them separately and then summarize them? The steps are different depending on the method of analysis.

It should be able to meet your needs, and the collected data can be directly entered into SPSS, which integrates data management and analysis, and does not need to be additionally entered into SQL Server Oracle, etc. In addition to that, foxtable can also be used. However, both tools require some database knowledge to be effective.

You just need to type it into Excel and then import it with SPSS.

1 All must first ensure:

1。In each manufacturer's worksheet, they are sorted by name.

2。The worksheet name of each manufacturer is exactly the same as the name of the manufacturer on the Production worksheet, with no spaces.

3。In the worksheet of each manufacturer, column A does not have empty cells.

Set the data validity in "Production" B2, and ** Unit Price is in column F.

Column B uses data validity.

Column e with the function vlookup