primary key: primary creates a clustered index on the
column and it doesn't allow null values.
unique key: unique key creates non clustered index by
default.it allows "one null value".
foreign key: A foreign key (FK) is a column or combination
of columns used to establish and enforce a link between the
data in two tables.
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what is the similarities between primary and secondary data
A primary key is a special case of unique keys which doesnt accept duplicates. The difference between unique keys is that "NOT NULL" constraint is not automatically enforced, while for primary keys it is mandatoryUnique keys and primary keys can be referenced by foreign keys
The primary curve was formed before birth but the secondary curve was formed after birth. Thats basically the difference between the two. hope that helps
what is the difference between primary and seconday vitamin deficiency
Identify the difference between primary sector and secondary sector
difference between primary auxiliary verbs and modal verbs
the difference between primary and secondary succession is that primary succession is the wipeout of something and then secondary succession is the regrowth.
Composite Key is made from two or more field. So a composite key can be a primary key or a foreign key. A foreign Key is the key referencing to a different table.
The difference between primary and secondary storage is in their state. Primary storage is temporary while secondary storage is permanent.
The difference between primary and general elections is that the general election picks the candidates on the primary ticket. Primary elections determine the winner of the office.
what is the difference beween primary and secondary needs
what are the diffrence between primary reserve and secondary reserve?
The similarities are: Database schema may be similar (Primary keys, foreign keys and indexes etc) SQL (Structures query language is also similar in a way) Referential integrity is also similar to a great extend)
The difference between primary data and secondary data is that primary data is the information from the original research.
what is the primary difference between selling points and benefits
They are both storage devices
The primary difference is a chemical bond is many times stronger than a attraction between molecules.
Whats the difference between Primary and secondary sources
A primary key is an attribute (or combination of attributes) that uniquely identifies each row in a relation. A primary key is designated by underlining the attribute name. The primary key of an entity set allows us to distinguish among the various entities of the set. A foreign key is an attribute in a relation of database that serves as the primary key of another relation in the same database.
Primary can't be recharged, secondary can be recharged.