PostgreSQL - 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.
SyntaxThe 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;
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)
Comments
Post a Comment