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The database schema is the structure of a database described in a formal language supported typically by a relational database management system (RDBMS). The term " schema " refers to the organization of data as a blueprint of how the database is constructed (divided into database tables in the case of relational databases ).
A hierarchical database model is a data model in which the data are organized into a tree-like structure. The data are stored as records which are connected to one another through links. A record is a collection of fields, with each field containing only one value. The type of a record defines which fields the record contains.
Fishes are a paraphyletic group and for this reason, the class Pisces seen in older reference works is no longer used in formal taxonomy.Traditional classification divides fish into three extant classes (Agnatha, Chondrichthyes, and Osteichthyes), and with extinct forms sometimes classified within those groups, sometimes as their own classes: [1]
Catalog of Fishes is a comprehensive on-line database and reference work on the scientific names of fish species and genera. It is global in its scope and is hosted by the California Academy of Sciences. It has been compiled and is continuously updated by the curator emeritus of the CAS fish collection, William N. Eschmeyer.
A table in a SQL database schema corresponds to a predicate variable; the contents of a table to a relation; key constraints, other constraints, and SQL queries correspond to predicates. However, SQL databases deviate from the relational model in many details , and Codd fiercely argued against deviations that compromise the original principles.
Several koi swim around in a pond in Japan. (video) A school of koi containing multiple different varieties Koi (鯉, Japanese:, literally "carp"), or more specifically nishikigoi (錦鯉, Japanese: [ɲiɕi̥kiꜜɡoi], literally "brocaded carp"), are colored varieties of carp (Cyprinus sp.) that are kept for decorative purposes in outdoor koi ponds or water gardens.
Anabas cobojius, the Gangetic koi, popularly known as Koi in Bengali, is a species of climbing gourami native to Bangladesh and India, where it occurs in many types of standing water bodies. This species reaches a total length of 30 cm (12 in) and is carnivorous, feeding on water invertebrates and their larvae.
A fish reference database is an electronic database that typically contains DNA barcodes, images, and geospatial coordinates of examined fish specimens. The database can also contain linkages to voucher specimens, information on species distributions, nomenclature, authoritative taxonomic information, collateral natural history information and ...