What is Primary Key in DBMS?5
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Q: What is Primary Key in DBMS?
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Explanation :
A primary key is a special relational database table column or combination of columns designated to uniquely identify all table records. That is, A primary key is a column or set of columns in a table that uniquely identifies tuples (rows) in that table. A primary key, also called a Primary Keyword. Main Features Primary key are :: It must contain a unique value for each row of data. It cannot contain null values.
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Since Nithya and Suganya exchange places, so Rita’s new position is the same as Monika’s earlier position. This position is 17th from the right and 10th from the left. Therefore Number of girls in the row = (16 + 1 + 9) = 26.