What are constraints? Explain different types of constraints?

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What are constraints? Explain different types of
constraints?

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What are constraints? Explain different types of constraints?..

Answer / wishpreet kaur

constraints are the restictions or boundaries.
we can categorise the constraints into 3 categories:
1. object constraints: specify that some objects depends
entirely or partially on other objects.
2. dynamic constraints: specify relationship among states
and events.
3. functional constraints: specify relationship among
operations.

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1 Yes

1 No

What are constraints? Explain different types of constraints?..

Answer / manikandan elangovan

Primary key
Foreign Key
Unique Key
Not Null
Check
default

Is This Answer Correct ?

0 Yes

0 No

What are constraints? Explain different types of constraints?..

Answer / rev

3 basic types
1.entity constraint:
check
not null
null
2.domain constraint:
unique
primary
composite primary key
3.referential constraint:
integrity
foreign

Is This Answer Correct ?

27 Yes

28 No

What are constraints? Explain different types of constraints?..

Answer / taru mathur

a constraint refers to a condition or a check that is
applied to a coloumn(field)or a set of coloumns in a table.
Their are mainly five types of constarints:
1. UNIQUE CONSTRAINT
2. PRIMARY KEY CONSTRAINT
3. DEFAULT CONSTRAINT
4. CHECK CONSTRAINT
5. FOREIGN KEY CONSTRAINT

Is This Answer Correct ?

5 Yes

6 No

What are constraints? Explain different types of constraints?..

Answer / k.swathi

constraint is a mechanism which is used to stop the data entered by the end user by implementing bussiness rules.

contraint are 6 types
1)unique
2)primary key
3)check
4)null
5)not null
6)foreign key(refferential key)

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0 Yes

1 No

What are constraints? Explain different types of constraints?..

Answer / md. aftab alam

It is a part of the table definition that are used to limit the values entered into its columns.its type are
1. Not null
2. Unique
3. primary key
4. Ckeck
5. Reference key

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0 Yes

1 No

What are constraints? Explain different types of constraints?..

Answer / kumarcsn

basically there are two types of constraints
1.TABLE LEVEL CONSTRAINTS
2.COLUMN LEVEL CONSTRAINTS

Is This Answer Correct ?

9 Yes

11 No

What are constraints? Explain different types of constraints?..

Answer / g.rajesh(m.tech)

constrain kis a rule.
types of constriants are
1.domain constrain:
eg:chjeck,default,not null.
2.entity constraints:
eg:primary key.
unique key
3.referential constrain:
eg:foreign key

Is This Answer Correct ?

7 Yes

9 No

What are constraints? Explain different types of constraints?..

Answer / henry

Constraints are used to restrict or protect the data and
accessing from the table
There are 5 types of constraints available,
That,
1.Primary-which is not allowed duplication and Null values
2.Unique-Which is also Not allowed duplication But It is
allowed one single null values
3.Foreign - Which is allowed duplication and Null values.
But It refers Value from primary Key table to its own table
Value.
4.Check Constratints
5.Not null

Is This Answer Correct ?

5 Yes

8 No

What are constraints? Explain different types of constraints?..

Answer / vijay

there are 5 types of constraints that is as follow...
1.primary key
2.not null
3.check
4.default
5.unique
this are constraints types........

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0 Yes

3 No

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