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DBMS SQL Select

DBMS SQL Select with DBMS Overview, DBMS vs Files System, DBMS Architecture, Three schema Architecture, DBMS Language, DBMS Keys, DBMS Generalization, DBMS Specialization, Relational Model concept, SQL Introduction, Advantage of SQL, DBMS Normalization, Functional Dependency, DBMS Schedule, Concurrency Control etc.

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SQL SELECT Statement

In SQL, the SELECT statement is used to query or retrieve data from a table in the database. The returns data is stored in a table, and the result table is known as result-set.

Syntax

SELECT column1, column2, ...
FROM table_name;

Here, the expression is the field name of the table that you want to select data from.

Use the following syntax to select all the fields available in the table:

SELECT  *  FROM table_name;

Example:

EMPLOYEE

EMP_ID EMP_NAME CITY PHONE_NO SALARY
1 Kristen Chicago 9737287378 150000
2 Russell Austin 9262738271 200000
3 Angelina Denver 9232673822 600000
4 Robert Washington 9367238263 350000
5 Christian Los angels 7253847382 260000

To fetch the EMP_ID of all the employees, use the following query:

SELECT EMP_ID FROM EMPLOYEE;

Output

EMP_ID
1
2
3
4
5

To fetch the EMP_NAME and SALARY, use the following query:

SELECT EMP_NAME, SALARY FROM EMPLOYEE;
EMP_NAME SALARY
Kristen 150000
Russell 200000
Angelina 600000
Robert 350000
Christian 260000

To fetch all the fields from the EMPLOYEE table, use the following query:

 SELECT * FROM EMPLOYEE

Output

EMP_ID EMP_NAME CITY PHONE_NO SALARY
1 Kristen Chicago 9737287378 150000
2 Russell Austin 9262738271 200000
3 Angelina Denver 9232673822 600000
4 Robert Washington 9367238263 350000
5 Christian Los angels 7253847382 260000

Next TopicDBMS SQL Insert




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