Friday 30 March 2012

Select Statement in SQL


Basic SQL Syntax

SELECT Statement:

        Select Statement used to retrieve the data from database (table)
and the results are displays in  table format, called Result-set

Syntax for retrieving all data from table:

        SELECT * FROM table_name;

Syntax for retrieving Selected Column data from table:

        SELECT Columnname(s) FROM table_name;
Examples:

The Table “Contact” has following data,

ID
NAME
DESIGNATION
CITY
MOBILE
1
venkat
CEO
Kodambakkam
999989845
2
Santhosh
manager
Puddukottai
9999898978
3
Kousilaya
Asst.manager
Trichy
9659315754
4
Ananth
CEO
Chennai
9999999945
5
Sajil
MD
Surandai
6677888997

We use following statement,

SELECT * FROM Contact;
The Result-set is,

ID
NAME
DESIGNATION
CITY
MOBILE
1
venkat
CEO
Kodambakkam
999989845
2
Santhosh
manager
Puddukottai
9999898978
3
Kousilaya
Asst.manager
Trichy
9659315754
4
Ananth
CEO
Chennai
9999999945
5
Sajil
MD
Surandai
6677888997


We use following statement,

SELECT Name,Designation,Mobile FROM Contact;
The Result-set is,

NAME
DESIGNATION
MOBILE
venkat
CEO
999989845
Santhosh
manager
9999898978
Kousilaya
Asst.manager
9659315754
Ananth
CEO
9999999945
Sajil
MD
6677888997

Note that, SQL is not Case-Sensitive.

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