DB Projects Help>>Specifying constraints and indexes in SQL
Indexes in SQL
Indexes or Spiders in databases are very similar to indexes in your local library. Spiders allow locating information within a collection fast, much like they do in your local library. If all books in a selection are listed alphabetically then you don't need to look at the whole selection to uncover particular publication. Instead you will simply get the first letter from the publication subject and you may discover this letter's area in the selection starting your investigation from there, which will small down your investigation significantly.
A List can be created on a single line or a variety of content in a collection desk. A desk index is a collection structure that sets up the principles of one or more content in a collection desk in specific obtain. The desk index has guidelines to the principles saved in specified line or mixture of content of the desk. These guidelines are requested with regards to the sort obtain specified in the index.
CREATE INDEX idxModel
ON Product (Model)
The format for developing spiders will vary amongst different RDBMS that is why we will not talk about this topic further.
Constraints in SQL
Is a predicate used in a WHERE condition to investigation content containing character-based information kinds for specific or unclear (less precise) meets to individual content, the area of thoughts within a certain range of one another, or heavy meets.
In SQL Web server, you can use four-part brands in CONTAINS or FREETEXT full-text predicates to do issues against attached web servers.
CONTAINS can investigation for:
An expression or expression.
The prefix of an expression or expression.
An expression near another expression.
An expression inflectionally created from another (for example, the term generate is the inflectional control of pushes, had, worries, and driven).
An expression that is a suggestion of another expression using a database (for example, the term steel can have alternatives such as material and steel).
Types of SQL Constraints
NOT NULL
UNIQUE
CHECK
Primary Key
Foreign Key
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