SQL Practice Exercise: Indexes Index command syntax: CREATE [UNIQUE] INDEX index_name ON table_name (index_column_name [(length)] [ASC|DESC], ...) ALTER TABLE tbl_name ADD [UNIQUE] INDEX index_name (index_columns) DROP INDEX index_name ON tbl_name ALTER TABLE tbl_name DROP INDEX index_name SHOW INDEX FROM tbl_name 1. Create a table with these names and characteristics: Table Name Column Name Data Type Length Comment ---------- ----------- --------- ------ -------- Staff: id int 3 name varchar 15 office char 7 fee decimal 7,2 reviewDate date - 2. Define an index for Name on the Staff table. It should allow duplicates. 3. Define an index for Id that prevents duplicate Id values. What constraint does this place on inserts to the tables? 4. Show a way to cause a unique index to be created for Id that does not allow NULL values. 5. Define an index to improve performance when searching by Name and Office. 6. Define an index for fee. Indicate the index is to be in descending order. What might be the purpose for overriding the default sequencing? 7. Issue a show index command to document the indexes. 8. Use the DROP INDEX command to remove one of the indexes created for this exercise. 9. Apply the ALTER TABLE command to remove another of the indexes.