SELECT Reference

SELECT Operations

Concatenate Columns

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Column name

Equi Join

Column name with spaces

NULL

The SELECT command is used to show data from a database.

The output from a SELECT statement is always a grid - with a number of rows and a number of columns.

Simple SELECT

The simplest SELECT commands involve a single table:

SQL	Result
SELECT name, population FROM bbc WHERE region='North America'	name population Canada 32000000 United States of America 295000000

• The SELECT line determines which columns to show - in this case name and population, both of which are columns of the bbc table.
• The WHERE clause determines which rows to show
• The SELECT statement may involve data from more than one table using a JOIN or a UNION.
• SELECT statements may nested - that is the output from one SELECT may be the input to another SELECT.
• The output from a SELECT may be added to another table using INSERT .. SELECT
• The select statement may aggregate values using a SELECT .. GROUP BY clause