What is data definition language, Database Management System

Assignment Help:

What is data definition language? Explain it in detail?

The SQL DDL allows specification of not only a set of relations, but also information after each relation, containing

a) The schema for each relation

b) The domain of values associated with each attribute

c) The integrity constraints

d) The set of indices to be maintained for each relation

e) The security and authorization information for each relation

f) The physical storage structure of each relation on disk

Domain Types in SQL

Char(n),

varchar(n), int, small int, numeric(p,d), real, double, precision,

f loat(n), date, time, timestamp.

Schema Definition in SQL

a) Primary key

b) Check

Related Discussions:- What is data definition language

DEADLOCK PREVENTION, WOUND-WAIT

WOUND-WAIT

Payment processors, We have a buildup of payments that need to be processed...

We have a buildup of payments that need to be processed. You will need:- To prepare customer account on our site Process payment (you must have working Paypal account to d

Information Technology, What benefits can a company gain by managing its ow...

What benefits can a company gain by managing its own information infrastructure and servicea

Fragmentation, let us consider a table having 2200 records and the fixed si...

let us consider a table having 2200 records and the fixed size of the table to be considered as 25.then how many numbers of table is requredto perform horizontal fragmentation

Example of alter table command, Example - ALTER TABLE emp MODIFY (empno NUM...

Example - ALTER TABLE emp MODIFY (empno NUMBER (7));

What is object identity, What is object identity? An object retains its...

What is object identity? An object retains its identity even if some or all the values of variables or explanations of methods change overtime.

Note gate, i want notes on this topic

i want notes on this topic

Define null values, Define null values. In some cases a certain entity ...

Define null values. In some cases a certain entity may not have an applicable value for an attribute or if we do not know the value of an attribute for a certain entity. In the

#title using the invoice, using the invoice table shown below,write the rel...

using the invoice table shown below,write the relational schema,draw a dependencies,inclunding all partial and transitive dependencies.assume that the table does not contain repeat

What are the different integrity constraints in rdbms, What are the differe...

What are the different integrity constraints in RDBMS? The various integrity constraints in RDBMS are as: Primary Key: primary key is a grouping of one or more attributes

Write Your Message!

Name

Email id

Message

Verfication Code

User Account

All Pages