Ask the master to help you do the SQL problem!!

Fill in the blanks: 1. The t-sql command to modify the structure of the data table is (alter)table; The command to delete a table is to specify the ascending order with (asc) and the descending order with (desc) in the (delete) by clause. If you don't specify ascending or descending order, it defaults to (ASC).

Judgment: 1. In SQL Server 2005, the statement used to retrieve data is the select statement of T-SQL. 2. If you want to output the query result of select in an orderly manner, you need to use the group by clause to cooperate.

3. When defining the table structure, you can use the null keyword to explicitly set a column as empty. (right).

4. The into clause is used to store the SELECT query result in a new table (right).

What is the difference between char(n) and varchar(n) in short-answer character data definitions? 1.After the length of char is defined, it will be automatically filled up if the storage length is not full, while varchar will not.

23.The delete table command is: drop table

24.There are three types of indexes in SQL Server: clustered indexes, unique indexes, and nonclustered indexes.

25.Data management has gone through the transition from manual management to document management.

26.The basic types of connections between entities are one-to-many, one-to-one, and many-to-many connections.

27.Data integrity can be divided into integrity, integrity, referential integrity, and user-defined integrity.

28.SQL Server 2000 local variable names must begin with , while global variable names must begin with .

You're so entangled in these questions. Between your two horizontal lines is your answer, isn't your answer all out?

VB hasn't been developed, but your system requirements are very simple, and can only be described as a small assignment, giving you a few suggestions.

1: Establish a database, establish a table, analyze the relationship between tables and tables thoroughly, and establish a good data database relationship, which will save a lot of time for future development.

2: Create requirements documents, as well as development documents, annotations, and what functions to develop at each stage.

3: It's okay to build a simple framework (if you haven't learned it) and crowd it all together, but it must be logical.

4: Software testing, debugging function whether there are bugs

5: Optimize the interface and package the program.

I'm also learning C++.,I think there's a lot of that kind on the Internet.,You go to the library to search for it.,It's almost the same to change the space inside!

1).Structured Query Language (SQL) is a database query and program.

An ordinal design language for accessing data and querying, updating, and managing relational database systems.

Feature 1:Comprehensive unity.

2.Highly non-process-oriented.

3.How collection-oriented operates.

4.Multiple ways to use it in the same grammatical structure.

5.The language is concise, easy to learn and use.

6.It is convenient and intuitive for data statistics.

2) A view is a SQL statement of a query stored in a database, and a view is a table derived from one or more tables or views, the structure of which is derived.

and data are based on queries on tables.

The advantage is that you can improve data security and prevent users from seeing a field in the table.

3) Tables, Views, Stored Procedures, Functions, Triggers, Primary Keys, Foreign Keys, Constraints, Indexes.

4) Indexes are another way of representing data that provides a different order of data than the order in which the data is physically stored on disk. Index.

The special role is to rearrange the physical location of the records within the table. An index can be built on a single column of a data table, or on several tables.

Columns on the combination.

Function: 1. The uniqueness of the data can be ensured through the unique index.

2. Speed up the retrieval of data.

3. Speed up the connection between tables.

4. Reduce grouping and sorting time.

5. Use the Optimized Hider to improve system performance.

5) Data integrity refers to the accuracy and reliability of data. It is necessary to prevent the presence of nots in the database.

Semantic data and to prevent invalid operations or error messages from being generated by the input and output of incorrect information.

There are four categories of data integrity:

1.Physical integrity.

2.Domain integrity.

3.Referential integrity.

4.User-defined integrity.