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Explain the two constraints, check and foreign key in SQL along with an example for each. Give the syntax.
CHECK constraint - CHECK constraint specifies an expression which must always be true for every row in the table. It can't refer to values within other rows.Syntax:ALTER TABLE ADD CONSTRAINT CHECK();
FOREIGN KEY constraint - A foreign key is a combination of columns along with values based on the primary key values from another table. A foreign key constraint, also called as referential integrity constraint, specifies in which the values of the foreign key correspond to actual values of the primary or unique key in other table. One can refer to a primary or unique key in the similar table also.
Syntax: ALTER TABLE ADD CONSTRAINT FOREIGN KEY()REFERENCES () ON {DELETE | UPDATE}CASCADE;
What is association? Give an example of association Association is used for establishing relationships among classes. Association describe links among/between classes. For exa
Describe file organisation? A file is organized logically as a sequence of records. These records are mapped onto disk blocks. A) Fixed-Length Records Type deposit=record
Partial Key : It is a group of attributes that can uniquely identify small entities and that are related to same base entity. It is sometime named as Discriminator. Altern
explain participation constraints with examples
What is the difference among a primary index and a secondary index? Primary Index: A primary index is an ordered file whose records are of fixed length along with two fields.
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I have one assignment that has to be done in neo4j
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How to Insert data in your table from another table? insert into e.g, To insert tuples from employee into N_emp created above, use following statement Insert into N_emp
Give some encryption techniques? A) DES B) AES C) Public key encryption
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