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SQL Select Statement




The SELECT statement selects columns of data from a database.

The tabular result is stored in a result table (called the
result set).


The SELECT Statement

The SELECT statement selects columns of data from a database.

Use it to SELECT information FROM a table like this:




SELECT column-name(s) FROM table-name






Example: Select Columns from a Table
To select the columns named "LastName" and "FirstName", use
a SELECT
statement like this:



SELECT LastName,FirstName FROM Persons




The "Persons" table:



LastName
FirstName
Address
City


Hansen
Ola
Timoteivn 10
Sandnes


Svendson
Tove
Borgvn 23
Sandnes


Pettersen
Kari
Storgt 20
Stavanger


The result:


LastName
FirstName


Hansen
Ola


Svendson
Tove


Pettersen
Kari





Example: Select all Columns
To select all columns from the "Person" table, use a * symbol
instead of column name like
this: 



SELECT * FROM Persons



The result:


LastName
FirstName
Address
City


Hansen
Ola
Timoteivn 10
Sandnes


Svendson
Tove
Borgvn 23
Sandnes


Pettersen
Kari
Storgt 20
Stavanger





The Result Table
The result from a SQL query is stored in a result set. The result set can be
thought of as a result table. Most database software allow navigation of the
result set with programming functions like: Move-To-First-Record,
Get-Record-Content, Move-To-Next-Record......
Programming functions like these are not a part of this tutorial.
If you want to learn more about accessing SQL data with function calls, study
our ADO School.




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