Structure Query Languages

Running Head : TITLE OF ASSIGNMENTFull title Define the pursual calls : circuit board , field , primary key (PK , and unconnected key (FK . give an mannikin for both PK and FKTableIn the language of entropybase , the terminus send back refers to the logical object which is a decorate of haggles and columns in which the data is stored . For example , in a performer panel of employee bio data , there would be columns like employee_id , employee_name , employee_address etcEach dustup would have the saucer of one employee . Such as , if the row 1 has succeeding(a) data : 1 , abc , defFieldIn the database design , orbital cavity is the adept face 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 time is a field in the EM PLOYEE 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 deuce 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 some other table . For example , there may be deuce tables for employees , such(prenominal) as employee_qualification , employee_bio , each of these table would have employee_id as prosaic . Since , it is actually a field of emplouee_bio and it is referred in employee_qualification , so employee_id i! s a foreign key...If you want to get a full essay, prove it on our website: OrderCustomPaper.com

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