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Answer»

tep go to Microsoft word 20.. and then CLICK on create table then design your data table , in design view u will get the option of editing .To edit your records u can go to the table and edit them .Primary key will not allow u to type ANYTHING that had already been type for EXAMPLE in railway stations , if the numbers are already GIVEN for some other passengers and u also have the same there might a confusion therefore primary key is being used to control the CONFUSIONS .



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