SELECT Query

PostgreSQL SELECT statement is used to fetch the data from a database table, which returns data in the form of result table. These result tables are called result-sets.

Syntax

The basic syntax of SELECT statement is as follows −SELECT column1, column2, columnN FROM table_name;

Here, column1, column2…are the fields of a table, whose values you want to fetch. If you want to fetch all the fields available in the field then you can use the following syntax −SELECT * FROM table_name;

Example

Consider the table COMPANY having records as follows − id | name | age | address | salary ----+-------+-----+-----------+-------- 1 | Paul | 32 | California| 20000 2 | Allen | 25 | Texas | 15000 3 | Teddy | 23 | Norway | 20000 4 | Mark | 25 | Rich-Mond | 65000 5 | David | 27 | Texas | 85000 6 | Kim | 22 | South-Hall| 45000 7 | James | 24 | Houston | 10000 (7 rows)

The following is an example, which would fetch ID, Name and Salary fields of the customers available in CUSTOMERS table −testdb=# SELECT ID, NAME, SALARY FROM COMPANY ;

This would produce the following result − id | name | salary ----+-------+-------- 1 | Paul | 20000 2 | Allen | 15000 3 | Teddy | 20000 4 | Mark | 65000 5 | David | 85000 6 | Kim | 45000 7 | James | 10000 (7 rows)

If you want to fetch all the fields of CUSTOMERS table, then use the following query −testdb=# SELECT * FROM COMPANY;

This would produce the following result − id | name | age | address | salary ----+-------+-----+-----------+-------- 1 | Paul | 32 | California| 20000 2 | Allen | 25 | Texas | 15000 3 | Teddy | 23 | Norway | 20000 4 | Mark | 25 | Rich-Mond | 65000 5 | David | 27 | Texas | 85000 6 | Kim | 22 | South-Hall| 45000 7 | James | 24 | Houston | 10000 (7 rows)