SQL Training Insert, Update & Delete. Insert, Update, Delete

SQL Training

Insert, Update & Delete

Insert, Update, Delete

•Confidential & ProprietaryCopyright © 2009 Cardinal Directions, Inc.

Manipulating Data

Referential Integrity

• “Thou shall not create orphans.”• Every child (foreign key) must have a matching parent (primary key).• You can not delete a parent if there is a matching child.• You can not add a child record if you do not have a matching parent record.

Update

InsertDeleteDatabase

You must remember the referential integrity rules when you manipulate data in the database.

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InsertAdd a new vendor:

VendorName: New2YouAddress: 9983 Buy Now Ave

Miami FL 32940Contact: Tracy KnewPhone: 321-987-1001Fax: 321-987-1000Email: [email protected] ProvinceID = 9

Referential Integrity Rules require which table to be populated first?

How are we going to determine the value for the vendorid?

Approved to supply component:

ComponentID: 14Vendor Code: N2U9870-CVendor Price: $45.98

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mailto:[email protected]


Insert

Insert into Vendor (VendorID, VendorName, Address1, City, ProvinceID, Phone, Fax, Email, VendorFirstName, VendorLastName)Values (102, 'New2You', '9983 Buy Now Ave','Melbourne',9, '321-987-1001', '321-987-1000','[email protected]', 'Tracy', 'Knew');

1. You can assign unique numbers, such as ID’s, to columns in your database using a sequence.

Create Sequence VendorID increment by 1 start with 1;We will assume that the next available vendorid is 102

2. We need to populate the data for the parent table (Vendor) first.

3. After each update to the database you need to commit. If you forget to commit, the changes will be rolled-back when you exit SQL Plus (the default action).

Commit;

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Insert

4. Next, we need to insert the data into the child (VendorComponent) table.

Commit;

Insert into VendorComponent (VendorID, ComponentID, VendorPartNumber, VendorPrice)

Values ((Select max(VendorID) from Vendor), 14, ‘N2U9870-

C’,45.98);

5. Again, we will need to commit to make the changes permanent in the database.

We have to figure out what VendorID was assigned in the parent table.

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Insert – Select

INSERT INTO FrenchVendor (VendorID, VendorName, ProvinceID, Address1, City, PostalCode)

SELECT VendorID, VendorName, Province.ProvinceID, Address1, City, PostalCode

FROM Vendor, Province, Country, RegionWHERE Vendor.ProvinceID = Province.ProvinceID and

Region.CountryID = Country.CountryID andProvince.RegionID = Region.RegionID andCountryName = 'France';

CREATE TABLE FrenchVendor ( VendorID INTEGER, VendorName VARCHAR2(30), ProvinceID INTEGER, Address1 VARCHAR2(30), City VARCHAR2(20), PostalCode VARCHAR2(15));

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UpdateUpdate the conversion rate of Canada to .00911.

UPDATE Country

SET CurrencyRate = .00911,

CurrencyDate = sysdate

WHERE CountryID = 2;

Updates the column values within one or more rows of a table.

1 row updated.

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Update Multiple Rows

Increase the unit price of all Butane Homegens by 2%.

UPDATE Product

SET ProductPrice = ProductPrice * 1.02

WHERE ProductDescription Like '%Butane%'

21 rows updated.

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DeleteDelete ProductCode HG5000-01B from the PurchaseOrder table.

DELETE FROM Product

WHERE ProductCode = ‘HG5000-01B’;

Note: The WHERE clause determines the rows that are deleted. If the WHERE clause is not specified, all rows are deleted (subject to referential integrity constraints).

ERROR at line 1: ORA-02292: integrity constraint (Oracle.SYS_C0042860) violated - child record found

Why do we get this error?

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Delete Multiple RowsDelete ProductCode HG5000-01B from the Product table.

Step 1: Delete the child rows from the Manifest Table.

DELETE FROM ManifestWHERE ProductID = (SELECT ProductID

FROM ProductWHERE ProductCode = 'HG5000-

01B');

Step 2: Delete parent record from the PurchaseOrder Table.

DELETE FROM Product

WHERE ProductCode = 'HG5000-01B';

Step 3: Commit

If you forget to commit after you have updated the database your changes will be rolled back (undo) as soon as you exit SQL Plus.

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Workshop


InsertAdd a new Survey record:

Column Value

Surveyid 803

Customerid 4

Userid 7

Requiredproductid 54

surveydate 2/8/2010

Q1 5

Q2 6

Q3 7

Q4 3

Q5 4

Q6 8

Q7 9

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UpdateChange the values below for survey is 803.

Column Value

Surveyid 803

Customerid

Userid

Requiredproductid

surveydate

Q1 4

Q2

Q3 6

Q4

Q5 8

Q6

Q7 2

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DeleteDelete survey 803.

Column Value

Surveyid 803

Customerid

Userid

Requiredproductid

surveydate

Q1 4

Q2

Q3 6

Q4

Q5 8

Q6

Q7 2

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SQL Training Insert, Update & Delete. Insert, Update, Delete