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What are primary keys and foreign keys?
Primary keys are the unique identifiers for every row. They must have unique values and cannot be null. Due to their significance in relational databases, Primary keys are the most fundamental of all keys and constraints. A table can have only one Primary key. Foreign keys are both a method of ensuring data integrity and a manifestation of the relationship among tables.
A program is backward compatible if it can use files from an older version of itself. For a file saved in the program to be backward compatible, it must be possible to open the fil
What are the different phases of consumer mercantile model? There are three different phase of consumer mercantile model like listed as in below: • Pre-purchase interaction
Q. Displaying the List of Files with DIR? You can display the list of files kept in a diskette or hard disk with the DIR commend. This Commends list files and sub directories i
Poor Technology or System Requirements Definition - Information System Previously we looked at product design and specifically the importance of requirements capture as part o
Application Using Shift Operations Rotate and Shift instructions are helpful even for division andmultiplication. These operations are not normally available in high-level lang
write er diagram for company database
Define Rules For Evaluating the Boolean Expression? Generally, the following rules must always be followed when evaluating the Boolean expression: Primary, perform all in
Compare excess 3 codes and gray code. Ans. Excess 3 Codes 1. This is the other form of BCD code. All decimal digits are coded in 4 bit binary code. 2. The code
Q. How to use an Assembler? Symbolic instructions which we code in assembly language is called as- Source program. An assembler program translates source program in machine
Describe the scheme of capability lists to implement protection? Capability lists (C- lists): These lists are utilized to make sure that uses only access files that are e
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