Create Access Database Pk Fk
How To Create Access Database
Using a CREATE TABLE statement SyntaxThe syntax for creating a foreign key using a CREATE TABLE statement is: CREATE TABLE tablename(column1 datatype null/not null,column2 datatype null/not null.CONSTRAINT fkcolumnFOREIGN KEY (column1, column2. Columnn)REFERENCES parenttable (column1, column2.
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Create Access Database Pk Fk Download
Columnn)); Example CREATE TABLE supplier( supplierid numeric(10) not null,suppliername varchar2(50) not null,contactname varchar2(50),CONSTRAINT supplierpk PRIMARY KEY (supplierid));CREATE TABLE products( productid numeric(10) not null,supplierid numeric(10) not null,CONSTRAINT fksupplierFOREIGN KEY (supplierid)REFERENCES supplier(supplierid));In this example, we've created a primary key on the supplier table called supplierpk. It consists of only one field - the supplierid field. Using an ALTER TABLE statement SyntaxThe syntax for creating a foreign key in an ALTER TABLE statement is: ALTER TABLE tablenameADD CONSTRAINT constraintnameFOREIGN KEY (column1, column2. Columnn)REFERENCES parenttable (column1, column2. Columnn); Example ALTER TABLE productsADD CONSTRAINT fksupplierFOREIGN KEY (supplierid)REFERENCES supplier(supplierid);In this example, we've created a foreign key called fksupplier that references the supplier table based on the supplierid field.We could also create a foreign key with more than one field as in the example below: ALTER TABLE productsADD CONSTRAINT fksupplierFOREIGN KEY (supplierid, suppliername)REFERENCES supplier(supplierid, suppliername).