Which of the following is not true about a relational database?
A. The database is made of separate tables.
B. A primary key and a foreign key are needed to relate two tables in the database.
C. Attributes in the database can be numeric or character.
D. None of these is correct.
Answer: D
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Drip irrigation is used on ____________________%of irrigated crop fields in the United States, and ____________________% of irrigated crop fields worldwide
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