EBK CONCEPTS OF DATABASE MANAGEMENT
8th Edition
ISBN: 8220100706004
Author: Last
Publisher: Cengage Learning US
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Question
Chapter 4, Problem 11RQ
To determine
Todefine Nulls.
To explain the fields that cannot accept null values.
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What are nulls? Which field cannot accept null values? Why?
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What do nulls actually mean? What kind of field cannot allow null values? Why?
Chapter 4 Solutions
EBK CONCEPTS OF DATABASE MANAGEMENT
Ch. 4 - Prob. 1RQCh. 4 - Prob. 2RQCh. 4 - Prob. 3RQCh. 4 - Prob. 4RQCh. 4 - Prob. 5RQCh. 4 - Prob. 6RQCh. 4 - Prob. 7RQCh. 4 - Prob. 8RQCh. 4 - Prob. 9RQCh. 4 - Prob. 10RQ
Ch. 4 - Prob. 11RQCh. 4 - Prob. 12RQCh. 4 - Prob. 13RQCh. 4 - Prob. 14RQCh. 4 - Prob. 15RQCh. 4 - Prob. 16RQCh. 4 - Prob. 17RQCh. 4 - Prob. 18RQCh. 4 - Prob. 1TDECh. 4 - Prob. 2TDECh. 4 - Prob. 3TDECh. 4 - Prob. 4TDECh. 4 - Prob. 5TDECh. 4 - Prob. 6TDECh. 4 - Prob. 7TDECh. 4 - Prob. 8TDECh. 4 - Prob. 9TDECh. 4 - Prob. 10TDECh. 4 - Prob. 11TDECh. 4 - Prob. 12TDECh. 4 - Prob. 13TDECh. 4 - Prob. 1CATCCh. 4 - Prob. 2CATCCh. 4 - Prob. 3CATCCh. 4 - Prob. 4CATCCh. 4 - Prob. 5CATCCh. 4 - Prob. 6CATCCh. 4 - Prob. 7CATCCh. 4 - Prob. 8CATCCh. 4 - Prob. 9CATCCh. 4 - Prob. 10CATCCh. 4 - Prob. 11CATCCh. 4 - Prob. 12CATCCh. 4 - Prob. 13CATCCh. 4 - Prob. 14CATCCh. 4 - Prob. 1SCGCCh. 4 - Prob. 2SCGCCh. 4 - Prob. 3SCGCCh. 4 - Prob. 4SCGCCh. 4 - Prob. 5SCGCCh. 4 - Prob. 6SCGCCh. 4 - Prob. 7SCGCCh. 4 - Prob. 8SCGCCh. 4 - Prob. 9SCGCCh. 4 - Prob. 10SCGCCh. 4 - Prob. 11SCGCCh. 4 - Prob. 12SCGC
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Similar questions
- Just what does "nulls" stand for? Which field type does not allow erroneous values? Why?arrow_forwardIs it feasible to control the integrity of a field by picking a certain data type as the value for that field?arrow_forwardWhat precisely are nulls? What kind of field does not allow for erroneous values? Why?arrow_forward
- Can you think of scenarios in which using default values will improve data integrity as well as conditions in which doing so would damage it?arrow_forwardIs this statement true or false? The term "null" refers to a column in a database table that does not contain any data and is thus empty.arrow_forwardWhat factors influence which index method is used?arrow_forward
- 1. Create a PL/SQL function. The minimal requirements: using the cursor in PLSQL function, retrieve data from object table and record the data in the PL/SQL table, make calculations with object data and define return value of the function, test the operation of the function (get the result). The maximal requirements: you can add IF-ELSEIF's, cursor processing in loops, more interesting semantic functions. 2. Create methods for object types. The minimal requirements: use map/order methods (1 method) (method+ demonstration), use MEMBER methods (2 methods) (methods + demonstration). The maximal requirements: non-trivial methods, that use more complex comparisons or do more complex calculations – i.e., give a couple more constructs in code. 3. Demonstrate the multiset operators. The minimal requirements: using 2 different multiset operators (can be included in the code), they can also be used in the The maximal requirements: the queries make sense semantically, one of the queries is a…arrow_forwardIs it possible to control the integrity of a field by selecting a certain data type?arrow_forwardWhat is a NULL value?arrow_forward
- If a field's data type is chosen carefully, can its security be managed?arrow_forwardWhat does the %TYPE attribute instruct the system to do? Answers: a, retrieve the database column data type for the variable b. copy a variable retrieve data from the database c. d. use a Boolean data typearrow_forwardCan you think about situations where range controls and null value controls will improve data integrity, and situations where using them may decrease data integrity?arrow_forward
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