If a column has high selectivity or cardinality, which index type is most appropriate?a. IOTb. B-treec. bitmapd. function-based index
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If a column has high selectivity or cardinality, which index type is most appropriate?
a. IOT
b. B-tree
c. bitmap
d. function-based index
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- 1-Write the syntax to insert into a relational table called students the address column references an object table called addresses that was created using an address_type. Other columns exist in the students table, but you are only inserting into the ones below. Aliases used should be the first letter of the table name, eg students would be s, addresses would be a Relational Table Name students attribute student_id attribute surname attribute addresspython - Write the syntax for obtaining the index where X == 0.How is a clustered index made, and what are the main differences between a clustered index and a sparse index?
- A data dictionary should have a full list of column names along with full description of each column, what the abbreviations within the columns stand for, the data type of each column. True FalseWrite Mysql code for: The database has three tables for tracking horse-riding lessons: Horse with columns: ID - primary key RegisteredName Breed Height BirthDate Student with columns: ID - primary key FirstName LastName Street City State Zip Phone EmailAddress LessonSchedule with columns: HorseID - partial primary key, foreign key references Horse(ID) StudentID - foreign key references Student(ID) LessonDateTime - partial primary key Write a SELECT statement to create a lesson schedule for Feb 1, 2020 with the lesson date/time, student's first and last names, and the horse's registered name. Order the results in ascending order by lesson date/time, then by the horse's registered name. Make sure unassigned lesson times (student ID is NULL) appear in the results. Hint: Perform a join on the LessonSchedule, Student, and Horse tables, matching the student IDs and horse IDs.101. The basic operations that can be performed on relations are a. deletion b. insertion c. modification d. all of above