Oracle 12c: SQL
Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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Chapter 4, Problem 18MC

You’re creating a new table consisting of three columns: Col1, Col2, and Col3. Col1 should be the primary key and can’t have any NULL values, and each entry should be unique. Col3 must not contain any NULL values either. How many total constraints do you have to create?

  1. a. 1
  2. b. 2
  3. c. 3
  4. d. 4
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You’re creating a new table consisting of three columns: Col1, Col2, and Col3. Col1 should be the primary key and can’t have any NULL values, and each entry should be unique. Col3 must not contain any NULL values either. How many total constraints do you have to create? ( refer to the tables in the JustLee Books database). a. 1 b. 2 c. 3 d. 4
3. What is a DEFAULT constraint?
Task 2: The Driver Relationship team wants to ensure that the all driving license IDs in the active drivers table have the length of 7. Alter the ACTIVE_DRIVERS table created in Chapter 8, Activity 1 to check the length of the DRIVER_DRIVING_LICENSE_ID. Add a CHECK to the ACTIVE_DRIVERS table to enforce a driver license length of 7. Test Query: SELECT DISTINCT(constraint_name) FROM information_schema.check_constraints WHERE constraint_schema = 'InstantRide' AND constraint_name = 'ACTIVE_DRIVERS_chk_1'   Expected Results CONSTRAINT_NAME ACTIVE_DRIVERS_chk_1

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Oracle 12c: SQL

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