Retrieving Data from Tables
Learn about retrieving data from tables in PostgreSQL.
We'll cover the following...
The SELECT
query
The basic unit of data storage in PostgreSQL is tables. A table consists of a collection of rows, and each row has a set of columns containing that row’s data. To get data out of a table, we use the SELECT
statement.
The most basic form of the SELECT
statement looks like this:
SELECT*FROM<table_name>;
The most basic SELECT statement
It will select all of the columns in the table_name
table. The wildcard character *
represents all the columns.
We can specify the columns to be selected:
SELECT<field_1>,<field_2>,...<field_n>FROM<table_name>WHERE<condition>
The syntax of the SELECT statement
Here, <field_1>, <field_2>, ...
represents the names of the columns we want to select and <table_name>
is the name of the table from which we want to fetch data.
We can use the SELECT
statement as below to retrieve data from a table, Employee
, containing four ...