Structure Query Languages

Running Head : TITLE OF ASSIGNMENTFull title Define the avocation calls : circuit board , field , primary key (PK , and conflicting key (FK . give an role model for both PK and FKTableIn the language of entropybase , the terminal figure send back refers to the logical object which is a dumbfound of course of instructions and columns in which the data is stored . For example , in a cats-paw panel of employee bio data , there would be columns like employee_id , employee_name , employee_address etcEach run-in would have the saucer of one employee . Such as , if the row 1 has succeeding(a) data : 1 , abc , defFieldIn the database design , field is the adept setting of each entity represented as a table . For example , for a table of employee , one of its aspect closely which the data is recorded is his age , so geeze rhood is a field in the EMPLOYEE tablePrimary keyPrimary key is the field in a table that uniquely identifies each record .

For example , in the EMPLOYEE table , employee_id is unique for each of the employee , no devil employees sens have same employee_id , so it can be employ as the primary keyForeign KeyThese are those fields in the table of a database which refers to some field in another(prenominal) table . For example , there may be devil tables for employees , such(prenominal) as employee_qualification , employee_bio , each of these table would have employee_id as frequent . Since , it is actually a fiel d of emplouee_bio and it is referred in empl! oyee_qualification , so employee_id is a foreign key...If you want to get a full essay, salt away it on our website: OrderCustomPaper.com

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