Oracle 12c: SQL
3rd Edition
ISBN: 9781305251038
Author: Joan Casteel
Publisher: Cengage Learning
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- What does it mean for two tables to be union compatible?arrow_forwardWrite the SQL code that will restore the data to its original status: that is, the table should contain the data that existed before you made the changes in Problems 5 and 6.arrow_forwardA table can have a maximum of how many PRIMARY KEY constraints?arrow_forward
- Insert the data into the tables you created in Problem 1.arrow_forwardHow do you create an index? How do you create a unique index? What is the difference between an index and a unique index?arrow_forwardWhat is the maximum number of PRIMARY KEY constraints allowed for a table? a. 1 b. 2 c. 30 d. 255arrow_forward
- When must you define constraints at the table level rather than the column level?arrow_forwardWhat guidelines should you follow when naming tables and columns in Oracle 12c?arrow_forwardHow is adding a NOT NULL constraint to an existing table different from adding other types of constraints?arrow_forward
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