A) Write a query which shows the employee IDs that are unique to the employee table. Order the employee IDs in descending order. An employee ID Is the same in both tables if the integer value of the ID matches.
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
(A) Write a query which shows the employee IDs that are unique to the employee table. Order the employee IDs in descending order. An employee ID Is the same in both tables if the integer value of the ID matches.
(B) We want to add a new column to the employee table. We want to provide a new column with a more complete phone number. Right now the PHONENO column only shows the last 4 digits. We want a new column which is called PHONE and consists of ###-###-####. The last 4-digits are already in the PHONENO column. The first three digits should be 416 and the next three should be 123. To improve clarity in the table, we also want to rename the PHONENO column to PHONEEXT. Show all the commands used to accomplish this, then, select all data for employees who have the last name of 'smith' (case insensitive).
(C) Show a list of employee id, names, department, years and job of any employee in the staff table who makes a total amount more than their manager or has more years of service than their manager. Make sure to include both salary and commission when calculating the total amount someone makes. Exclude staff in department 10 from the query. Order the results by department then name
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