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