This Doc Consist of ER diagram of University and NHL, Introduction to posgres SQL and installation,DML and its various commands,implementation of constraints with examples,DML Implementation with set operations & Functions,Implementation of nested Queries.

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Submitted To:- Submitted By:-
Sir Arun Kumar Uttam Singh Chaudhary
(17EMBIT055)

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Table of Contents
S.no Experiment Page no.
1 Database design using E-R model of
university
4
2 Database design using E-R model
National Hockey league
5-8
3 Introductionto PostGres SQL and its
installation.
9-17
4 Implementation of Data Definition
language (DML), Commands with
Examples
i. Create Database
ii. Select Database
iii. Delete Database
iv. Create Table
v. Delete Table
vi. Insertion Data into table, Etc.
18-23
5 Implement type of Constraintswith
Examples
(a) Primary key, (b) Foreign Key,
(c) Check, (d) Unique (e) Null
(f) Not null, (g) Default
24-28
6 Implementation on Data
Manipulation (DML) (Introductionto
29-32

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SQL)
a. Select clause
b. From clause
c. Where clause
7 implementation on Data
Manipulation (DML)
a. Aggregation functions (Min,
Max, Sum, Avg, count)
b. Group by clause
c. Having
d. Rename operation (as)
33-36
8 Implementation on Data
Manipulation (DML), Set Operations
a. Union Operation
b. Intersect Operation
c. Except Operation
37-39
9 Implementation of Nested Queries 40-45
10 Create a Company Database and
Write SQL retrieval queries with
example.
46-54

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Experiment:-1
Aim:-Design a ER diagram for the University
database
Fig :1
It describe different entities having relation with each other.

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Experiment:-2
Aim:-Design a clean and clear ER diagram for the NHL
Database.
Fig:-2
It describes National hockey league database with different
entities having set of attributes with relationship among them.

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Definitions:
1. Entity:- An entity can be any real world object that has an
independent existence.
E.g.:- person, place, object etc.
2. Attributes:- Attributes can be described as the properties of
entities.
Types of attributes:-
 Simple:- Attributes which can’t be broken into
smaller subparts.
E.g.:- Student Id.
Composite:- Attributes which can be broken down
into smaller parts.
E.g.:- Student Name.
 Single valued:-Attributes having only one value.
E.g.:- Student Age.
Multi-valued:- Attributes having more thanone value.
E.g.:-Student Mobile Number
 Stored:-Attribute which is already present as an
attribute for an entity.

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E.g.;- Student college duration can be calculated using date of
joining. Here Date of joining is stored attribute.
Derived:- Attribute which is derived from stored attributes it
was not present as an attribute for an entity.
E.g.:- Student college duration is derived attribute.
 Null:-Attributes having null values.
E.g.:- Student Mobile Number may or may not have
null value.
3. Specialization:- It is a process of creating subclasses out of
given entity types.
4. Generalization:- It is a process in which two or more entity
types are taken and grouped under a common subclass. It
is a reverse process of specialization.
5. Relationship:- This shows relations between different
entities and hold together various component of ER model.
6. Keys:- Keys are the attributes used to distinguish one entity
from another in entity set.

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TYPES OF KEYS:-
 Super key:- It is a set of key having one or more
attribute that can uniquely identify entity in a entity
set.
 Candidate Key:- Least combination of attributes that
can uniquely identify an entity set. It could be subset
of super key.
 Primary Key:- It is the candidate key which is most
appropriate key for the table. It is decided by the
administrator.
 Foreign Key:- It is generally a primary key that serve
as a field to another field in the same database.
 Simple Key:- It is a key having single attribute.
 Composite key:-It is a key which is not simple key but
having more than one attribute.
 Compound Key:- It is key which is not composite key.
 Alternate Key:-It is term used for candidate key
which is chosen after choosing a primary key by
database designer.

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Experiment 3
Aim: Introduction to PostGreSQL and its installation.
SQL is also called SE-QU-EL. It has got some historical
significance - the initial name of SQL
was Simple English Query Language.
You will be using PostgreSQL as the relational database
management system. PostgreSQL is very light-weight,
and it is free as well.
What is PostgreSQL?
PostgreSQL is a powerful, open source object-relational
database system that uses and extends the SQL language
combined with many features that safely store and scale
the most complicated data workloads.
PostgrSQL has earned a strong reputation for its proven
architecture, reliability, data integrity, robust feature set,
extensibility, and the dedication of the open source
community behind the software to consistently deliver
performing and innovative solutions.

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PostgreSQL runs on all major operating systems, has
been ACID-compliant since 2001, and has powerful add-
ons such as the popular PostGRES geospatial database
extender. It is no surprise that PostgreSQL has become
the open source relational database of choice for many
people and organizations .
Install PostgreSQL step by step
Start Installing PostgreSQL
Specify installation folder, choose your own or keep the
default folder suggested by PostgreSQL installer.

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Enterthe password for the database super user and service
account.
Enter the port for PostgreSQL. Make sure that no other
applications are using this port. Leave it as default if you
are unsure.

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Choose the default locale used by the database.

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You’ve completed providing information for the
PostgreSQL installer. Click the Next button to install
PostgreSQL

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The installation may take few minutes to complete.

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Click the Finish button to complete the PostgreSQL
installation.
Verify the Installation
There are several ways to verify the installation. You can
try to connect to the PostgreSQL database server from
any client application e.g., psql and pgAdmin.
The quick way to verify the installation is through
the pgAdmin application.

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First, click on pgAdmin III to launch it. The pgAdmin III
GUI will display.
Second, double-click PostgreSQL 9.5 on the object
browser. It will ask you for the admin password. Just
enter the password you’ve used in the installation step.

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Third, if everything is fine, the pgAdmin will display all
the objects that belong to the server.
Congratulation!you’ve successfully installed PostgreSQL
database server on your local system.

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Experiment:-4
Aim:-Implementation of Data Definition language
(DML), Commands with Examples
i. Create Database
ii. Select Database
iii. Delete Database
iv. Create Table
v. Delete Table
vi. Insertion Data into table, Etc.
DDL- Data Definition Language (DDL) statements are
used to define the database structure or schema.
DDL uses different statements :
CREATE - to create objects in the database
ALTER - alters the structure of the database
DROP - delete objects from the database
TRUNCATE - remove all records from a table, including
all spaces allocated for the records are removed

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COMMENT - add comments to the data dictionary
RENAME - rename an object
CREATE TABLE
Syntax: Create table tablename( fieldname1
datatype(),fieldname2 datatype()...);
ALTER TABLE
1. ADD
2.MODIFY
ADD
Syntax:alter table table name ADD (fieldname
datatype()...);
modify
syntax: Alter table table name modify (fieldname
datatype()...);
DESCRIBE TABLE
Syntax: DESCRIBE TABLE NAME;
DROP TABLE
Syntax: DROP Table name;

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COMMENT - add comments to the data dictionary
RENAME - rename a table
Synatax: rename table table name to new table name
Examples : In this example we creates a table and insert
the values.

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Example : In the following figure shows the alter a table .
For Example : In this figure shows the describe
command.

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DML- Data Manipulation Language (DML) statements
are used for managing data within schema objects DML
deals with data manipulation, and therefore includes most
common SQL statements such SELECT, INSERT, etc.
DML allows to add / modify / delete data itself.
DML is used to manipulate with the existing data in the
database objects (insert, select, update, delete).
DML Commands:
1.INSERT
2.SELECT
3.UPDATE
4.DELETE
*INSERT:
Syntax: INSERT INTO Table name values();
*SELECT:
Syntax: Select*from <table name>
*UPDATE:
Syntax: Update<table name> set to(calculation);
*DELETE:
Syntax: Delete form<table name>

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Example : In the below figure shows the update and
delete command on the given table.

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Experiment :-5
Aim:-Implement type of constraints with examples
(a) Primary key
(b) Foreign key
(c) Check
(d) Unique
(e) Null
(f) Not null
(g) Default
Primary Keys:
Primary key uniquely identifies each record in a table. It
must have unique values and cannot contain nulls. In the
below example the ROLL_NO field is marked as primary
key, that means the ROLL_NO field cannot have
duplicate and null values.

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CREATE TABLE STUDENT(
ROLL_NO INT NOT NULL,
STU_NAME VARCHAR (35) NOT NULL UNIQUE,
STU_AGE INT NOT NULL,
STU_ADDRESS VARCHAR (35) UNIQUE,
PRIMARY KEY (ROLL_NO)
);
Foreign keys: are the columns of a tablethat points to the
primary key of another table. They act as a cross-
reference between tables.
This constraint is used for specifying range of values for a
particular column of a table. When this constraint is being
set on a column, it ensures that the specified column must
have the value falling in the specified range.
CREATE TABLE STUDENT(
ROLL_NO INT NOT NULL CHECK(ROLL_NO
>1000) ,
STU_NAME VARCHAR (35) NOT NULL,

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STU_AGE INT NOT NULL,
EXAM_FEE INT DEFAULT 10000,
STU_ADDRESS VARCHAR (35) ,
PRIMARY KEY (ROLL_NO)
);
In the above example we have set the check constraint on
ROLL_NO column of STUDENT table. Now, the
ROLL_NO field must have the value greater than 1000.
UNIQUE Constraint:enforces a column or set of columns
to have unique values. If a column has a unique
constraint, it means that particular column cannot have
duplicate values in a table.
CREATE TABLE STUDENT(
ROLL_NO INT NOT NULL,
STU_NAME VARCHAR (35) NOT NULL UNIQUE,
STU_AGE INT NOT NULL,
STU_ADDRESS VARCHAR (35) UNIQUE,
PRIMARY KEY (ROLL_NO)

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);
NOT NULL: constraint makes sure that a column does
not hold NULL value. When we don’t provide value for a
particular column while inserting a record into a table, it
takes NULL value by default. By specifying NULL
constraint, we can be sure that a particular column(s)
cannot have NULL values.
Example:
CREATE TABLE STUDENT(
ROLL_NO INT NOT NULL,
STU_NAME VARCHAR (35) NOT NULL,
STU_AGE INT NOT NULL,
STU_ADDRESS VARCHAR (235),
PRIMARY KEY (ROLL_NO)
);

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The DEFAULT: constraint provides a default value to a
column when there is no value provided while inserting a
record into a table.
Example:-
CREATE TABLE STUDENT(
ROLL_NO INT NOT NULL,
STU_NAME VARCHAR (35) NOT NULL,
STU_AGE INT NOT NULL,
EXAM_FEE INT DEFAULT 10000,
STU_ADDRESS VARCHAR (35) ,
PRIMARY KEY (ROLL_NO)
);

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Experiment:-6.
Aim:-Explain Data ManipulationLanguage(DML)
with examples in DBMS.
Data manipulation language (DML) can be defined as a
set of syntax elements that are used to manage the data in
the database. The commands of DML are not auto
committed and modification made by them are not
permanent to the database. It is a computer programming
language that is used to perform select, insert delete and
updatedata in a database.Theuser requests are assisted by
data manipulation language. This language is responsible
for all forms of data modification in a database.
Types of Data Manipulation Languages.
1.Procedural programming
In this type the user will specify what data is required
and how to get it.
2 Declarative programming
Here, the user will only specify what data is required

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Commands
The DML section of SQL consists of following a set of
commands.
 Select/From/Where
 Insertinto/values
 Update/set/where
 Delete/from/where
The database programmers and users are allowed by this
basic to enter the data and information into the database
and then retrieve it by the use of several numbers of filter
option.
 Select/from/where
 Select
It is one of the basic query commands available in SQL
and works in the same way as the projection operation of
relational algebra. The attributes are selected by this
command on the basis of the condition defined by the
where clause.
 From
A relation name is taken by this clause as an argument
from where attributed are to be projected or selected.

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 Where
The predictions or conditions that should match for
qualifying the attributed to be projected are defined by
this clause.
For example
Select author_name
From book-set
Where age>40
The name of the authors will be yield by the command
from the relation book set whose age is greater than 40.
e.g.
SQL> select*from student

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OUTPUT:-
ROLL NO. NAME MARKS ADDR
101 ABC 75 LINK ROAD
102 XYZ 80 JM ROAD
103 PQR 87 N7
SQL>select *from student where marks=80
ROLL NO. NAME MARKS ADDR
102 XYZ 80 JM ROAD

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Experiment:7
Aim:- Implementationof Aggregate Functions
These functions operate on the multiset of values of a
column of a relation, and return a value
avg: average value
min: minimum value
max: maximum value
sum: sum of values
count: number of values
Q.1 Find the avg salary of employee from employee table
Ans:- Select avg(salary)
From employee
Q.2 Find the no. of employee who worksin dept-no.2
Ans:- Select count(*)
From employee
Where dept-no.2

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Q.3 Find the no. of cities where dept present
Ans:-Select count(distinct(city))
From department
Q.4 Give the age of oldest employee
Ans:-Select max(age)
From employee
Q.5 Find the mini. Age of employee whose salary is
greater than 50K
Ans:- Select min(age)
From employee
Where salary>50K
Q.6 Find the total salary of all employees
Ans:- Select sum(salary)
From employee

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Aggregate Functions –Group By
Find the average salary of instructors in each department
 select dept_name, avg(salary) as avg_salary
from instructor
group by dept_name;
Attributes in select clause outside of aggregate functions
must appear in group bylist
/* erroneous query */
select dept_name, ID, avg(salary)
from instructor
group by dept_name;
Aggregate Functions –Having Clause
Find the names and average salaries of all departments
whose average salary is greater than 42000

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 select dept_name, avg(salary)
from instructor
group by dept_name
having avg(salary) > 42000;
Note: predicates in the havingclause are applied after the
formation of groups whereas predicates in the where
clause are applied before forming groups
RENAME OPERATOR:-
Employee(employee_name,e_id,age,salary)
Q. Find the name of employee whose salary is greater
than 20K
Select employee_name as name
From employee
Where salary>20K

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Experiment:-8
Aim:-Implementation of Set operations on Data
manipulation language
Set Operations:-
Find courses that ran in Fall 2009 or in Spring 2010
(selectcourse_idfrom section where sem= ‘Fall’ and year
= 2009)
 Union
(selectcourse_idfrom section where sem= ‘Spring’ and
year = 2010)
Find courses that ran in Fall 2009 but not in Spring 2010
(selectcourse_idfrom section where sem= ‘Fall’ and year
= 2009)
 Intersect
(selectcourse_idfrom section where sem= ‘Spring’ and
year = 2010)

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Find courses that ran in Fall 2009 and in Spring 2010
(selectcourse_idfrom section where sem= ‘Fall’ and year
= 2009)
 Except
(selectcourse_idfrom section where sem= ‘Spring’ and
year = 2010)
1.Find the salaries of all instructors that are less than the
largest salary
select distinct T.salary
from instructor as T, instructor as S
where T.salary< S.salary
2.Find all the salaries of all instructors
select distinct salary
from instructor

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3.Find the largest salary of all instructors
(select“second query” )
Except
(select“first query”)
Set operations union, intersect, and except
Each of the above operations automatically eliminates
duplicates
To retain all duplicates use the corresponding multiset
versions union all, intersect alland except all.
Suppose a tuple occurs mtimes in rand n times in s, then,
it occurs:
m + n times in r union all s
min(m,n)times in rintersect all s
max(0, m –n)times in rexcept all s

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EXPERIMENT-9
Aim:-IMPLEMENTATION OF NESTED QUERIES
In nested queries, a query is written inside a query. The
result of inner query is used in execution of outer query.
We will use STUDENT, COURSE,
STUDENT_COURSEtablesfor understandingnested
queries.
STUDENT
S_ID S_NAME S_ADDRESS S_PHONE S_AGE
S1 RAM DELHI 9455123451 18
S2 RAMESH GURGAON 9652431543 18
S3 SUJIT ROHTAK 9156253131 20
S4 SURESH DELHI 9156768971 18

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COURSE
C_ID C_NAME
C1 DSA
C2 Programming
C3 DBMS
STUDENT_COURSE
S_ID C_ID
S1 C1
S1 C3
S2 C1
S3 C2
S4 C2
S4 C3

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There are mainly two types of nested queries:
 Independent Nested Queries: In independent nested
queries, query execution starts from innermost query
to outermost queries. The execution of inner query is
independent of outer query, but the result of inner
query is used in execution of outer query. Various
operators like IN, NOT IN, ANY, ALL etc are used in
writing independent nested queries.
IN: If we want to find out S_ID who are enrolled
in C_NAME ‘DSA’ or ‘DBMS’, we can write it with
the help of independent nested query and IN operator.
From COURSE table, we can find
out C_ID for C_NAME ‘DSA’ or DBMS’ and we can
use these C_IDs for finding S_IDs
from STUDENT_COURSE TABLE.
STEP1: Finding C_ID for C_NAME =’DSA’or
‘DBMS’
Select C_ID from COURSE where C_NAME = ‘DSA’
or C_NAME = ‘DBMS’

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STEP 2: Using C_ID of step 1 for finding S_ID
Select S_ID from STUDENT_COURSEwhere C_ID IN
(SELECT C_ID from COURSE where C_NAME =
‘DSA’ or C_NAME=’DBMS’);
STEP 3: Using C_ID of step 1 for finding S_ID
Select S_ID from STUDENT_COURSEwhere C_ID IN
(SELECT C_ID from COURSE where C_NAME =
‘DSA’ or C_NAME=’DBMS’);
The inner query will return a set with members C1 and C3
and outer query will return those S_IDs for
which C_ID is equal to any member of set (C1 and C3 in
this case). So, it will return S1, S2 and S4.
Note: If we want to find out names of STUDENTs
who have either enrolledin ‘DSA’ or ‘DBMS’, it can
be done as:

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Select S_NAME from STUDENT where S_ID IN
(Select S_ID from STUDENT_COURSE
where C_ID IN
(SELECT C_ID from COURSE where C_NAME=’DSA
’ or C_NAME=’DBMS’));
NOT IN: If we want to find out S_IDs
of STUDENTs who have neither enrolled in ‘DSA’
nor in ‘DBMS’, it can be done as:
Select S_ID from STUDENT where S_ID NOT IN
(Select S_ID from STUDENT_COURSE
where C_ID IN
(SELECT C_ID from COURSE where C_NAME=’
DSA’ or C_NAME=’DBMS’));
The innermost query will return a set with members C1
and C3. Second inner query will return those S_IDs for
which C_ID is equal to any member of set (C1 and C3 in
this case) which are S1, S2 and S4. The outermost query
will return those S_IDs where S_ID is not a member of
set (S1, S2 and S4). So it will return S3.

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 Co-related Nested Queries: In co-related nested
queries, the output of inner query dependson the row
which is being currentlyexecuted in outer query. e.g.;
If we want to find out S_NAME of STUDENTswho
are enrolled in C_ID ‘C1’, it can be done with the
help of co-related nested query as:
Select S_NAME from STUDENT S where EXISTS
( select * from STUDENT_COURSE SC where
S.S_ID=SC.S_ID and SC.C_ID=’C1’).
For each row of STUDENT S, it will find the rows
from
STUDENT_COURSE
where S.S_ID = SC.S_ID and SC.C_ID=’C1’.
If for a S_ID from STUDENT S, atleast a row exists
in STUDENT_COURSE SC with C_ID=’C1’, then
inner query will return true and
corresponding S_ID will be returned as output.

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Experiment:-10
Aim:-Create a company database and Write SQL
Retrieval Queries with example
CREATE TABLE employee (
emp_idINT PRIMARY KEY,
first_nameVARCHAR(40),
last_nameVARCHAR(40),
birth_dayDATE,
sexVARCHAR(1),
salaryINT,
super_idINT,
branch_idINT
);
CREATE TABLE branch (
branch_idINT PRIMARY KEY,
branch_nameVARCHAR(40),
mgr_idINT,
mgr_start_dateDATE,

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FOREIGN KEY(mgr_id) REFERENCES
employee(emp_id) ONDELETESETNULL
);
ALTERTABLE employee
ADD FOREIGN KEY(branch_id)
REFERENCESbranch(branch_id)
ONDELETESETNULL;
ALTERTABLE employee
ADD FOREIGN KEY(super_id)
REFERENCESemployee(emp_id)
ONDELETESETNULL;
CREATETABLEclient (
client_idINT PRIMARY KEY,
client_nameVARCHAR(40),
branch_idINT,

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FOREIGN KEY(branch_id) REFERENCES
branch(branch_id) ONDELETESETNULL
);
CREATETABLEworks_with (
emp_idINT,
client_idINT,
total_salesINT,
PRIMARY KEY(emp_id, client_id),
FOREIGN KEY(emp_id) REFERENCES
employee(emp_id) ONDELETECASCADE,
FOREIGN KEY(client_id)
REFERENCESclient(client_id) ONDELETECASCADE
);
CREATETABLEbranch_supplier(
branch_idINT,
supplier_nameVARCHAR(40),
supply_typeVARCHAR(40),

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PRIMARY KEY(branch_id,supplier_name),
FOREIGN KEY(branch_id) REFERENCES
branch(branch_id) ONDELETECASCADE
);
-- -------------------------------------------------------------------
----------
Corporate
INSERTINTO employee VALUES(100, 'David',
'Wallace', '1967-11-17', 'M', 250000, NULL, NULL);
INSERTINTO branch VALUES(1, 'Corporate', 100,
'2006-02-09');
UPDATE employee
SETbranch_id = 1
WHEREemp_id = 100;

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INSERTINTO employee VALUES(101, 'Jan', 'Levinson',
'1961-05-11', 'F', 110000, 100, 1);
-- Scranton
INSERTINTO employee VALUES(102, 'Michael', 'Scott',
'1964-03-15', 'M', 75000, 100, NULL);
INSERTINTO branch VALUES(2, 'Scranton', 102, '1992-
04-06');
UPDATE employee
SETbranch_id = 2
WHEREemp_id = 102;
INSERTINTO employee VALUES(103, 'Angela',
'Martin', '1971-06-25', 'F', 63000, 102, 2);
INSERTINTO employee VALUES(104, 'Kelly', 'Kapoor',
'1980-02-05', 'F', 55000, 102, 2);

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INSERTINTO employee VALUES(105, 'Stanley',
'Hudson', '1958-02-19', 'M', 69000, 102, 2);
-- Stamford
INSERTINTO employee VALUES(106, 'Josh', 'Porter',
'1969-09-05', 'M', 78000, 100, NULL);
INSERTINTO branch VALUES(3, 'Stamford', 106,
'1998-02-13');
UPDATE employee
SETbranch_id = 3
WHEREemp_id = 106;
INSERTINTO employee VALUES(107, 'Andy',
'Bernard', '1973-07-22', 'M', 65000, 106, 3);
INSERTINTO employee VALUES(108, 'Jim', 'Halpert',
'1978-10-01', 'M', 71000, 106, 3);

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-- BRANCH SUPPLIER
INSERTINTObranch_supplierVALUES(2, 'Hammer
Mill', 'Paper');
INSERTINTObranch_supplierVALUES(2, 'Uni-ball',
'Writing Utensils');
INSERTINTObranch_supplierVALUES(3, 'Patriot
Paper', 'Paper');
INSERTINTObranch_supplierVALUES(2, 'J.T. Forms &
Labels', 'Custom Forms');
INSERTINTObranch_supplierVALUES(3, 'Uni-ball',
'Writing Utensils');
INSERTINTObranch_supplierVALUES(3, 'Hammer
Mill', 'Paper');
INSERTINTObranch_supplierVALUES(3, 'Stamford
Lables', 'Custom Forms');

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-- CLIENT
INSERTINTOclientVALUES(400, 'Dunmore
Highschool', 2);
INSERTINTOclientVALUES(401, 'Lackawana Country',
2);
INSERTINTOclientVALUES(402, 'FedEx', 3);
INSERTINTOclientVALUES(403, 'John Daly Law,
LLC', 3);
INSERTINTOclientVALUES(404, 'Scranton
Whitepages', 2);
INSERTINTOclientVALUES(405, 'Times Newspaper',
3);
INSERTINTOclientVALUES(406, 'FedEx', 2);

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-- WORKS_WITH
INSERTINTOworks_withVALUES(105, 400, 55000);
INSERTINTOworks_withVALUES(102, 401, 267000);
INSERTINTOworks_withVALUES(108, 402, 22500);
INSERTINTOworks_withVALUES(107, 403, 5000);
INSERTINTOworks_withVALUES(108, 403, 12000);
INSERTINTOworks_withVALUES(105, 404, 33000);
INSERTINTOworks_withVALUES(107, 405, 26000);
INSERTINTOworks_withVALUES(102, 406, 15000);
INSERTINTOworks_withVALUES(105, 406, 130000);