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Comprehension check. Mark the following statements as True or False.

 

1. The field is a basic element of a structured file.

2. The field contains the biggest unit of meaningful information.

3. The length of a field is always fixed.

4. Simple data, such as names and addresses, can be stored in flat files.

5. Every relation is a sequence, or list, of records.

6. Relationships can be changed or deleted on demand.

 

Vocabulary practice

1. In the text, find the synonyms to the given words.

a node important several typically to perform to comprise

 

2. Fill in the blanks choosing from the variants given.

1. The most popular database model today is a … database.

a) relational b) object-oriented c) non-object

2. The data you enter in a … field cannot exceed the allocated field length.

a) fixed-length b) variable-length

3. All the records in a table are of the same record … .

a) group b) type c) set

4. The simplest database model arranges record types as a … .

a) hierarchy b) column c) relation

5. Each field has a … field name that describes its contents.

a) unique b) unusual c) unknown

6. All the records in a table are of the … record type.

a) same b) different c) simple

 

3. Make two-word combinations using the words in columns and then fill in the gaps in the following sentences.

A: non-object-oriented B: type

a many-to- many relationship

record database

flat length

simple data

allocated file

 

1. Any kind of record is referred to as a … .

2. Flat files can be used to store …, such as names and addresses.

3. Moreover, if the data you enter is shorter than the …, blank spaces are automatically added to fill the field.

4. There is no equivalent to a method in a … .

5. A structure file that contains only one record type is often referred to as a … .

6. … means that one record in a particular record type can be related to many records in another record type, or vice versa.

 

4. Fill in the gaps in the text.

Computer databases evolved from manual file processing technology in which data is stored in a single ___ file that uses a uniform format for every item the file contains. A ___ holds the smallest unit of meaningful information. A series of data fields forms a ___, which stores data about one entity – a person, place, thing, or event.

Each kind of record is referred to as a record type. A record that contains data is sometimes referred to as a record ___. A ___ file contains only one record type. In contrast, a ___ can contain a variety of different record type.

 

Speaking. Discuss the following questions.

1. What is a database?

2. What is the basic element of a structured file?

3. What is a record?

4. What is involved in defining the structure for records in a file?

5. What are relationships?

 

Text B

 

Reading. Read the text and try to guess the meaning of the words in bold. Check your variants in the dictionary.

 


Date: 2015-01-12; view: 1280


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