Can you help me write these queries? (Database code is located beneith the questions)

4.4. Write a query to list all jobs that have work entered for them. Include the job ID, job

description, and job status description. List the total hours worked for each job with the lowest,

highest, and average hourly rate. The average hourly rate should be weighted based on the

number of hours worked at that rate. Make sure that your data includes at least one job that

does not have hours logged. This job should not be included in the query. Order by highest to

lowest average hourly rate.

4.5. Write a query that lists all materials that have not been used on any jobs. Include Material ID

and Description. Order by Material ID.

4.6. Create a query that lists all workers with a specific skill, their hire date, and the total number of

jobs that they worked on. List the Skill ID and description with each row. Order by Worker ID.

4.7. Create a query that lists all workers that worked greater than 20 hours for all jobs that they

worked on. Include the Worker ID and name, number of hours worked, and number of jobs

that they worked on. Order by Worker ID.

CREATE TABLE TCustomers

(

intCustomerID INTEGER NOT NULL

,strFirstName VARCHAR(30) NOT NULL

,strLastName VARCHAR(30) NOT NULL

,strAddress VARCHAR(30) NOT NULL

,strCity VARCHAR(30) NOT NULL

,intStateID INTEGER NOT NULL

,strZipcode VARCHAR(30) NOT NULL

,CONSTRAINT TCustomers_PK PRIMARY KEY( intCustomerID )

)

CREATE TABLE TStates

(

intStateID INTEGER NOT NULL

,strState VARCHAR(30) NOT NULL

,CONSTRAINT TStates_PK PRIMARY KEY( intStateID )

)

CREATE TABLE TJobStatus

(

intJobStatusID INTEGER NOT NULL

,strJobStatus VARCHAR(30) NOT NULL

,CONSTRAINT TJobStatus_PK PRIMARY KEY( intJobStatusID )

)

CREATE TABLE TJobs

(

intJobID INTEGER NOT NULL

,intCustomerID INTEGER NOT NULL

,intJobStatusID INTEGER NOT NULL

,strJobDescription VARCHAR(2000) NOT NULL

,dteStartDate DATE NOT NULL

,dteEndDate DATE NOT NULL

,CONSTRAINT TJobs_PK PRIMARY KEY( intJobID )

)

CREATE TABLE TWorkers

(

intWorkerID INTEGER NOT NULL

,strFirstName VARCHAR(30) NOT NULL

,strLastName VARCHAR(30) NOT NULL

,dteDateOfHire DATE NOT NULL

,monHourlyRate MONEY NOT NULL

,CONSTRAINT TWorkers_prk PRIMARY KEY( intWorkerID )

)

CREATE TABLE TJobWorkers

(

intJobID INTEGER NOT NULL

,intWorkerID INTEGER NOT NULL

,intTotalHours INTEGER NOT NULL

,CONSTRAINT TJobWorkers_PK PRIMARY KEY( intJobID,intWorkerID )

)

CREATE TABLE TSkills

(

intSkillId INTEGER NOT NULL

,strSkillDescription VARCHAR(30) NOT NULL

,CONSTRAINT TSkills_PK PRIMARY KEY( intSkillId )

)

CREATE TABLE TWorkerSkills

(

intWorkerID INTEGER NOT NULL

,intSkillId INTEGER NOT NULL

,CONSTRAINT TWorkerSkills_PK PRIMARY KEY( intWorkerID,intSkillID )

)

CREATE TABLE TMaterials

(

intMaterialID INTEGER NOT NULL

,strMaterialName VARCHAR(30) NOT NULL

,monMaterialCost MONEY NOT NULL

,CONSTRAINT TMaterials_PK PRIMARY KEY( intMaterialID)

)

CREATE TABLE TJobMaterials

(

intMaterialID INTEGER NOT NULL

, intJobID INTEGER NOT NULL

,intQuantity INTEGER NOT NULL

,CONSTRAINT TJobMaterials_PK PRIMARY KEY( intJobID, intMaterialID)

)

ALTER TABLE TWorkerSkills ADD CONSTRAINT TWorkerSkills_TSkills_FK

FOREIGN KEY ( intSkillId ) REFERENCES TSkills ( intSkillId )

ALTER TABLE TWorkerSkills ADD CONSTRAINT TWorkerSkills_TWorkers_FK

FOREIGN KEY ( intWorkerID) REFERENCES TWorkers ( intWorkerID )

ALTER TABLE TJobs ADD CONSTRAINT TJobs_TJobStatus_FK

FOREIGN KEY ( intJobStatusID ) REFERENCES TJobStatus ( intJobStatusID )

ALTER TABLE TJobs ADD CONSTRAINT TJobs_TCustomers_FK

FOREIGN KEY ( intCustomerID ) REFERENCES TCustomers ( intCustomerID )

ALTER TABLE TJobMaterials ADD CONSTRAINT TJobMaterials_TMaterials_FK

FOREIGN KEY ( intMaterialID) REFERENCES TMaterials ( intMaterialID)

ALTER TABLE TJobMaterials ADD CONSTRAINT TJobMaterials_TJobs_FK

FOREIGN KEY ( intJobID ) REFERENCES TJobs ( intJobID )

ALTER TABLE TJobWorkers ADD CONSTRAINT TJobWorkers_TJobs_FK

FOREIGN KEY ( intJobID ) REFERENCES TJobs ( intJobID)

INSERT INTO TStates (intStateID,strState)

VALUES (1,'Ohio')

,(2,'Alaska')

,(3,'Iowa')

,(4,'Florida')

,(5,'Kentucky')

,(6,'Indiana')

,(7,'New York')

INSERT INTO TCustomers(intCustomerID, strFirstName,strLastName,strAddress,strCity,intStateID,strZipcode)

VALUES (1,'Jav','Nee','1 Main Street','Cincinnati',1,'45212')

,(2,'Umye','Onn','2 Main Street','Harper',3,'66223')

,(3,'Ansel','Adams','3 Main Street','KEn',4,'88812')

,(4,'Jenny','Smith','4 Hopple Street','Hamilton',2,'78582')

,(5,'Woodrow','Wilson','5 New Street','Butler',5,'85236')

INSERT INTO TWorkers (intWorkerID,strFirstName,strLastName,dteDateOfHire, monHourlyRate)

VALUES (1,'Richard','Jefferson','05/01/2014',12.00)

,(2,'Top', 'Gun','01/01/2015',15.00)

,(3,'Joe', 'Joe','02/01/2011',11.00)

,(4,'KEvin', 'Smith','03/01/2017',82.00)

,(5,'Leroy', 'Brown','04/01/2011',51.00)

,(6,'Sue', 'ME','05/01/2010',22.00)

INSERT INTO TJobStatus (intJobStatusID,strJobStatus)

VALUES (1,'Open ')

,(2,'In Process')

,(3,'Complete')