How do you create an index? How do you create a unique index? What is the difference between an index and a unique index?

Write SQL command to create above table “course” and insert the above values.   ccode cname C101 Database concepts and design C102 Software Engineering C103 Human Computer Interaction C104 Programming-2 C105 Multimedia Write SQL command to create above table “student” with REFERENCES and insert the above values. Hints:- In table student ccode is a FOREIGN KEY.     sid sname ccode 101 Abdullah Ahmad C101 102 Ali C102 103 Hazmi C104 104 Khalid C102 105 Ali Ahmad C103   Write SQL command to display sname(student name) from student table and corresponding cname(course name) from course table using inner join.   Your output should be like this sname cname Abdullah Ahmad Database concepts and design Ali Software Engineering Hazmi Programming-2 Khalid Software Engineering Ali Ahmad Human Computer Interaction    (in a program mycmpiler)

1. Open SQL Microsoft SQL Management Studio. 2. Create a database named DB_CompanyX. 3. Create tables for the database. See Table 1 for the table name, column name, and data type. Table 1. Creating Tables Table Name Data Type Column EMPLOYEE_NO *primary key* BIGINT BIRTH_DATE DATE FIRST_NAME VARCHAR (50) TBL_EMPLOYEE LAST_NAME VARCHAR (50) GENDER VARCHAR HIRE_DATE DATE EMPLOYEE_NO *foreign key* BIGINT TITLE VARCHAR (50) TBL_EMP_TITLE FROM_DATE DATE TO_DATE DATE EMPLOYEE_NO *foreign key* BIGINT SALARY INT TBL_EMP_SALARY FROM_DATE DATE TO_DATE DATE EMPLOYEE_NO *foreign key* BIGINT DEPARTMENT_NO *foreign key* CHAR (10) TBL_DEPT_EMP FROM_DATE DATE TO_DATE DATE 02 Task Performance 1 *Property of STI Page 1 of 2 STI IT1924 DEPARTMENT_NO *primary key* CHAR (10) TBL_DEPARTMENTS DEPARTMENT_NAME VARCHAR (40) DEPARTMENT_NO *foreign key* CHAR (10) EMPLOYEE_NO *foreign key* BIGINT TBL_DEPARTMENT_MANAGER FROM_DATE DATE TO_DATE DATE 4. Create a database diagram and include all the tables. 5. Using…

Read the data into a DataFrame with ID as the index. Convert the “Hired” column into Date/Time data type Create a new column with years of experience with the company at present without rounding. Create a new Boolean column for senior status with employees with at least 10 years of experience as senior and others are not. Create a new column for longevity pay equal to $150 per whole year of experience in the company. Create a list of column names for each data type in the DataFrtame.

Find the names of the pilots who are not certified to fly the aircrafts in the flight table. Sort the name by ascending order.

What exactly is an index? What are the benefits and drawbacks of utilising indexes? How do you make an index with SQL?

I NEED HELP WITH THIS QUESTION FOR MY DATABASE MANAGEMENT  Edit Question I NEED HELP WITH THIS QUESTION FOR MY DATABASE MANAGEMENT CLASS. How would you add PK to a table, without dropping it, for which no PK was declared with Create.

Make your own relation instance(s)○ Determine a schema○ Write a CREATE command for the instance(s)○ Choose another SQL command that modifies the relation and write it in full

please improe this writing: There is a big difference between time it takes to perform each of the queries. After adding primary key to each table, the time to perform each of the queries was faster than what it was before. Creating a primary key help identify unique data. Primary key in a table is a crucial column used in queries, optimized for fast performance with an associated index. The primary key index is the most efficient access path for a table. They are created after a table is created, optimizing search speed. Once constructed, indexes are internal structures that the user cannot actively access. If the internal query optimization procedure concludes that using an index will increase search efficiency, then it will be employed. When SQL queries are internally ready for execution, they automatically undergo optimization. The best way to run each query is determined by the optimization process, which may or may not include using a relevant index. Read and write speeds are…

Candidate Key is a key that     may have many duplicates     may be absent     may be a foreign key     contain only unique values and fully defines all other attributes in a row