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first step 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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