Composite key, or composite primary key, refers to cases where more than one column is used to specify the primary key of a table.
In this table, the first three fields, Quarter_ID, Student_ID, Course_ID, together form a composite key.
Our table will look like the following: Table.In such cases, all foreign keys will also need to include all the columns in the composite key.For this, we want to record which student took what class during what quarter, along with the date of registration, date of drop (if the class was dropped and the final grade.In all cases the composite key created consists of COL1 and COL2.Shop per categorie, binnen 30 seconden tegoed bestellen, code direct per e-mail.Note that the columns that make up a composite key can be of different data types.Below is the SQL syntax for specifying a composite key: create table table_name (column_1 data_type_1, column_2 data_type_2, primary KEY (column_1, column_2, Some database-specific examples are shown below.Class_History, quarter_ID, student_ID, course_ID, date_Registered, date_Dropped, final_Grade.Maakt gebruik van cookies (en daarmee vergelijkbare technieken) om onze site persoonlijker te maken en je te voorzien van relevante advertenties.Veilig en betrouwbaar afrekenen, je bent hier: Home Gamecards Nintendo eShop, betaalmethoden is gevestigd in Nederland en is onderdeel van.Als je verdergaat op onze website gaan we ervan uit dat je dat goedvindt.
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Each of them individually cannot uniquely identify each record, but together the combination of all three does uniquely identify each record.
MySQL, create table sample_table (COL1 integer, COL2 varchar(30 COL3 varchar(50 primary KEY (COL1, COL2 Oracle, create table sample_table (COL1 integer, COL2 varchar(30 COL3 varchar(50 primary KEY (COL1, COL2 SQL Server, create table sample_table (COL1 integer, COL2 nvarchar(30 COL3 nvarchar(50 primary KEY (COL1, COL2 Composite Key.
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