SQL for ETL Testing

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SQL FOR ETL TESTING
 What is Web Services?
It is a middleware developed in XML. Exchange the data between multiple
platforms.
 What is web services?
It is middleware technology developed in XML to exchange the data between
multiple platforms and languages.
 what is rest protocol ?
REST stands for Representational State Transfer. (It is sometimes spelled
"ReST".)
EST is a lightweight alternative to mechanisms like RPC (Remote Procedure
Calls) and Web Services (SOAP, WSDL, et al.). Later, we will see how much
more simple REST is.
Despite being simple, REST is fully-featured; there's basically nothing you can do
in Web Services that can't be done with a RESTful architecture.
REST is not a "standard". There will never be a W3C recommendation for REST,
for example. And while there are REST programming frameworks, working with
REST is so simple that you can often "roll your own" with standard library
features in languages like Perl, Java, or C#.

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 In Interviews they ask do you have work experience in web based
applications, does that mean having experience in web services in
SOAPUI ?
Ans: NO
 What is synchronous web services? -- get response immediately.
 What is asynchronous web services? --Response will be sent when the
service is available.
 What is SOAPUI? It is a tool to test the Web Services.
 what is xml schema?-- XML schema is well defined xml structure. It is w3
standards.
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 9). In Interviews if they ask do you have work experience in
web based applications, does that mean having experience
in web services in soapUI?
Ans: NO.
Create a table:
CREATE TABLE customer
(First_Namechar (50),
Last_Namechar(50),
Address char(50),
City char(50),
Country char(25),
Birth_Date date) ;
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2. Add a column to a table:
ALTER TABLE customer ADD SO_INSURANCE_PROVIDER
Varchar2(35);
3. DROP a column to a table
ALTER TABLE customer DROP column
SO_INSURANCE_PROVIDER
Varchar2(35);
4. Add a default value to a column
ALTER TABLE customer MODIFY SO_INSURANCE_PROVIDER
Varchar2(35) DEFAULT 'ABC Ins';
5. Renaming a table:
ALTER TABLE suppliers RENAME TO vendors;
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6. Modifying column(s) in a table:
ALTER TABLE supplier MODIFY supplier_namevarchar2(100)
not null;
7. Drop column(s) in a table:
ALTER TABLE supplier DROP COLUMN supplier_name;
8. Primary key:
CREATE TABLE supplier
(
supplier_id numeric(10) not null,
supplier_namevarchar2(50) not null,
contact_namevarchar2(50),
CONSTRAINT supplier_pk PRIMARY KEY (supplier_id,
supplier_name)
);
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 Add primary key:
ALTER TABLE supplier add CONSTRAINT supplier_pk
PRIMARY KEY
(supplier_id);
 Drop primary key:
ALTER TABLE supplier drop CONSTRAINT supplier_pk;
 Disable primary key:
ALTER TABLE supplier disable CONSTRAINT supplier_pk;
 Enable primary key:
ALTER TABLE supplier enable CONSTRAINT supplier_pk;
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 Foreign key creation:
(
CONSTRAINT supplier_pk PRIMARY KEY (supplier_id)
);
CREATE TABLE products
(
product_id numeric(10) not null,
CONSTRAINT fk_supplier
FOREIGN KEY (supplier_id)
REFERENCES supplier(supplier_id)
);
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14. More than column :
(
CONSTRAINT supplier_pk PRIMARY KEY (supplier_id, supplier_name)
);
CREATE TABLE products
(
Product_id numeric (10) not null,
Supplier_id numeric (10) not null,
supplier_name varchar2 (50) not null,
CONSTRAINT fk_supplier_comp
FOREIGN KEY (supplier_id, supplier_name)
REFERENCES supplier (supplier_id, supplier_name)
);

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Alter foreign key:
ALTER TABLE products add CONSTRAINT fk_supplier FOREIGN KEY
(supplier_id) REFERENCES supplier (supplier_id);
Drop foreign key:
ALTER TABLE SALES_ORDER_LINE DROP FOREIGN KEY
FK_SALES_ORDER_LINE_PRODUCT
Check constraint:
ALTER TABLE EMPLOYEE ADD CONSTRAINT REVENUE CHECK
(SALARY + COMM > 25000)
Drop check constraint:
ALTER TABLE EMPLOYEE DROP CONSTRAINT REVENUE CHECK
(SALARY + COMM > 25000)
19. Drop Table:
DROP TABLE customer;

 Truncate Statement:
Truncate table customer;
*********************************************************************End of DDL
Statements*********************************************************************
**
****************************************************************** DML
Statements
***************************************************************************
Insert rows in table:
1) INSERT INTO Store_Information (store_name, Sales, Date)
VALUES ('Los Angeles', 900, 'Jan-10-1999')
2) INSERT INTO Store_Information (store_name, Sales, Date) SELECT
store_name, Sales, Date FROM Sales_Info WHERE Year
(Date) = 1998

Update Statement in table:
UPDATE suppliers SET name = 'HP' WHERE name =
'IBM';
UPDATE suppliers
SET supplier_name =
(SELECT customers.name
FROM customers
WHERE customers. customer_id = suppliers.
supplier_id);

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24. Delete Statement in table:
25 DELETE FROM suppliers WHERE
supplier_name = 'IBM';
26 DELETE FROM suppliers
WHERE EXISTS
( select customers.name
from customers
wherecustomers.customer_id =
suppliers.supplier_id
andcustomers.customer_name = 'IBM' );
************************** select statement

Select Statement in table:
1. SELECT LastName, FirstName FROM Persons;
2. SELECT * FROM Persons;
The SELECT DISTINCT Statement:
SELECT DISTINCT Company FROM Orders;
The WHERE Clause:
SELECT * FROM Persons WHERE City='Sandnes‘
Using LIKE
SELECT * FROM Persons WHERE FirstName LIKE 'O%'

31. Arithmetic Operation:
Operator Description
= Equal
<> Not equal
> Greater than
< Less than
>= Greater than or equal
<= Less than or equal
BETWEENBetween an inclusive range
LIKE Search for a pattern
IN If you know the exact value you
want to return for at least one of the
columns

BETWEEN ... AND:
SELECT * FROM Persons WHERE LastName
BETWEEN 'Hansen' AND
'Pettersen';
IN
SELECT * FROM Persons WHERE LastName IN
('Hansen','Pettersen');
Column Name Alias
SELECT LastName AS Family, FirstName AS Name
FROM Persons

AND & OR
SELECT * FROM Persons WHERE FirstName='Tove' AND
LastName='Svendson'
SELECT * FROM Persons WHERE firstname='Tove' OR
lastname='Svendson'
ORDER BY
SELECT Company, OrderNumber FROM Orders ORDER
BY Company
SELECT Company, OrderNumber FROM Orders ORDER
BY Company
DESC, OrderNumber ASC

Group by Clause:
SELECT Company, SUM (Amount) FROM Sales GROUP BY
Company;
Having Clause:
SELECT Company, SUM (Amount) FROM Sales GROUP BY
Company
HAVING SUM (Amount)>10000;
Using UNION Clause:
SELECT E_Name FROM Employees_Norway
UNION
SELECT E_Name FROM Employees_USA

UNION ALL Clause:
SELECT E_Name FROM Employees_Norway
UNION ALL
SELECT E_Name FROM Employees_USA
JOINS:
Referring to Two Tables:
SELECT Employees.Name, Orders.Product
FROM Employees, Orders
WHERE Employees.Employee_ID=Orders.Employee_ID
INNER JOIN:
FROM Employees
INNER JOIN Orders
ON Employees.Employee_ID=Orders.Employee_ID;

LEFT JOIN:
FROM Employees
LEFT JOIN Orders
RIGHT JOIN:
FROM Employees
RIGHT JOIN Orders

Subqueries:
1) Select distinct country from Northwind.dbo.Customers
where country not in (select distinct country from
Northwind.dbo.Suppliers);
2) Select top 1 OrderId, convert (char (10),
OrderDate, 121) Last_Paris_Order,
(Select convert (char (10), max (OrderDate), 121) from
Northwind.dbo.Orders) Last_OrderDate,
datediff(dd,OrderDate,
(select Max(OrderDate) from Northwind.dbo.Orders))
Day_Diff
fromNorthwind.dbo.Orders
whereShipCity = 'Paris' order by OrderDatedesc;

Commit & Rollback Statements:
1) UPDATE suppliers SET name = 'HP' WHERE name
= 'IBM';
Commit;
2) UPDATE suppliers SET name = 'HP' WHERE name
= 'IBM';
Rollback;
SavepointStatement:
INSERT INTO DEPARTMENT VALUES ('A20', 'MARKETING',
301);
SAVEPOINT SAVEPOINT1;
INSERT INTO DEPARTMENT VALUES ('B30', 'FINANCE', 520);
SAVEPOINT SAVEPOINT2;

SQL for ETL Testing

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