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- этимология
Что (кто) такое foreign key - определение
Foreign key
FIELD OR COLLECTION OF FIELDS IN ONE TABLE THAT UNIQUELY IDENTIFIES A ROW OF ANOTHER TABLE OR THE SAME TABLE
Foreign key constraint; Foreign Key
A foreign key is a set of attributes in a table that refers to the primary key of another table. The foreign key links these two tables.
foreign key
FIELD OR COLLECTION OF FIELDS IN ONE TABLE THAT UNIQUELY IDENTIFIES A ROW OF ANOTHER TABLE OR THE SAME TABLE
Foreign key constraint; Foreign Key
<database> A column in a database table containing values
that are also found in some primary key column (of a
different table). By extension, any reference to entities of
a different type.
Some RDBMSs allow a column to be explicitly labelled as a
foreign key and only allow values to be inserted if they
already exist in the relevant primary key column.
[Is it still a foreign key if the primary key is in a different
column in the __same__ table? ]
(2005-01-14)
Key (music)
![ii-V<sup>7</sup>-I progression]] in C [[File:Ii-V-I turnaround in C.mid]]](https://commons.wikimedia.org/wiki/Special:FilePath/Ii-V-I turnaround in C.png?width=200 "ii-V<sup>7</sup>-I progression]] in C [[File:Ii-V-I turnaround in C.mid]]")
TONIC NOTE AND CHORD OF A MUSICAL PIECE
Major key; Key (Music); Musical key; Major Key; Key of D; Musical keys; Key coloration; Key relationship; Musical Key; Music key; Minor-key; Minor–key; Major-key; Key of E
In music theory, the key of a piece is the group of pitches, or scale, that forms the basis of a musical composition in classical, Western art, and Western pop music.
