Q1) Write a query that count the employees in each department? Q2) Write a query that retrieve all employees information who are in 'Hessa' department? Q3) Write a query that find the number of the employees in each department which salaries total greater than or equal the salaries total of department 30? Q4) Modify the information for the employee whose ID 1004, change the job to Writer?
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.
Course:
![Employee Employee
Name
Salary
ID
1001
1002
1003
1004
1005
Alaa
1006 Mariam
ename
mmmm
Eman
Ali
Moosa
Hessa
www
sal
550
600
900
300
600
800
Employee
Phone
Number
empno
wwwwww
39999999
Emp
job
Developer
CS
39999998
39999997
HR
39999996 Network
39999995
Server
39999994
SE
Department
number
deptno
10
20
40
30
30
10
Department
name
dname
IT
Registration
Admin
Date of
hiering
hiredare
3/3/2000
3/4/2000
3/5/2000
Engineering 3/6/2000
Engineering
3/7/2000
IT
3/8/2000
From the above table, Answer the questions:
Q1) Write a query that count the employees in each department?
Q2) Write a query that retrieve all employees information who are in 'Hessa' department?
Q3) Write a query that find the number of the employees in each department which salaries
total greater than or equal the salaries total of department 30?
Q4) Modify the information for the employee whose ID 1004, change the job to Writer?
Q5) Delete the employees data who have same salary of the employee has ID is 1002?
Q6) Write query that display ID, ename, sal, deptno, dname, hiredate for all
employees.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fc08ed3f6-a324-46fa-a6bb-f36b7e7df867%2F8f9ab56b-a844-4692-912d-6b728125e4ac%2F26qbioj_processed.png&w=3840&q=75)
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