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skelet666 [1.2K]
3 years ago
12

Difference between primary key and foreign key

Computers and Technology
1 answer:
Diano4ka-milaya [45]3 years ago
7 0

Answer:

A primary key uniquely identifies a record in the relational database table, whereas a foreign key refers to the field in a table which is the primary key of another table.

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What is the missing If condition in the following code fragment? The program is supposed to halt if the input file does not exis
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Answer:

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if ( !inFile )

Explanation:

The full codes are as follows:

  1.    ifstream inFile;
  2.    inFile.open("myfile.dat");
  3.    if ( !inFile )
  4.    {
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  6.        return 1;
  7.    }
  8.    return 0;

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