Given following two tables (EMPLOYEE, DEPARTMENT). Note, Dno in table EMPLOYEE and Dnumber in table DEPARTMENT all refer to the same thing (department number). CREATE TABLE EMPLOYEE ( Fname VARCHAR(15) Minit CHAR, Lname VARCHAR(15), Ssn CHAR(9), Bdate DATE, Address VARCHAR
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.
Activity Description
Given following two tables (EMPLOYEE, DEPARTMENT). Note, Dno in table
EMPLOYEE and Dnumber in table DEPARTMENT all refer to the same thing (department number).
CREATE TABLE EMPLOYEE
( Fname VARCHAR(15)
Minit CHAR,
Lname VARCHAR(15),
Ssn CHAR(9),
Bdate DATE,
Address VARCHAR(30),
Sex CHAR,
Salary DECIMAL(10,2),
Super_ssn CHAR(9),
Dno INT,
PRIMARY KEY (Ssn));
CREATE TABLE DEPARTMENT
( Dname VARCHAR(15),
Dnumber INT,
Mgr_ssn CHAR(9),
Mgr_start_date DATE,
PRIMARY KEY (Dnumber));
- Write a single SQL statement to find the sum of the salaries of all employees of the ‘Engineering’ department, as well as the maximum salary, the minimum salary, and the average salary in this department.
- Based on Employee table, write a single SQL statement for each department, retrieve the department number, the number of employees in the department, and their average salary.
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