week09 - sql 1

8/8/2019 Week09 - SQL 1

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Database I

SQL

SELECT Statement

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SELECT Statement (1/3)

SELECT is the SQL command for querying

(retrieving) data from a database table, view,

or other object etc. Basic syntax of the SELECT statement in a

textual form (Backus-Naur Form)

SELECT { [alias.]column | expression | [alias.]*[ , « ] }

FROM [schema.]table [alias];

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Creating Table (1/3) Before we start executing the SQL

statements, we need some data and tables

and there by database

Click the Go to Database Home Page

Enter the password for sys user to log in

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Creating Table (2/3) Create Student table

by selecting create

menu from object

browser

Define the columns as shown in figure and

click next

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Creating Table (2/3) Create Student table

by selecting create

menu from object

browser

Define the columns as shown in figure and

click next

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Creating Table (3/3) Click next two times and then finish

Click create to confirm

To insert some sample data, select data from

top menu and then insert row

Insert data for individual columns. Click createto insert data

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Different Flavors of SQL Statement

(1/6)

Simple Queries

SELECT * FROM STD;

SELECT RNo, Name, Address FROM STD;

SELECT RNo * 2 "Double RNo", Name FROM STD;

SELECT RNo * 2 DoubleRNo, Name FROM STD;

SELECT S.RNo, S.Name, S.FName FROM STD S;

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(2/6)SELECT (S.RNo + 2) / 10 , S.Name, S.FName FROM STD S;

WHERE Clause Adds conditions that filter out rows

Use various comparison conditions and logical operators

between each filter

Comparison

Operators:

Equi (=),

anti (!=, <>),

range (<, >,

=<, >=)

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(3/6)SELECT Name, Address FROM STD WHERE RNo = 100;

SELECT * FROM STD WHERE RNo > 102;

SELECT * FROM STD WHERE Name = 'Jamal Khan';

LIKE pattern-matches between strings % and _ characters are pattern-matching wild card

characters

% is used to representing zero or more characters in a

subset of a string

_ is used to represent one and only one character

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(4/6)SELECT * FROM STD WHERE Name LIKE '%G%';

SELECT Name, FName FROM STD WHERE

Name LIKE '_a%';

SELECT Name, FName FROM STD WHERE Address IN(

'Peshawar', 'Lahore');

SELECT RNo, Name, FName FROM STD WHERE RNo BETWEEN

100 AND 102;

week09 - sql 1

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