From http://www.w3schools.com (Copyright Refsnes Data)
This chapter will explain the SELECT and the SELECT * statements.
The SELECT statement is used to select data from a database.
The result is stored in a result table, called the result-set.
SELECT column_name(s) FROM table_name |
and
SELECT * FROM table_name |
Note: SQL is not case sensitive. SELECT is the same as select.
The "Persons" table:
P_Id | LastName | FirstName | Address | City |
---|---|---|---|---|
1 | Hansen | Ola | Timoteivn 10 | Sandnes |
2 | Svendson | Tove | Borgvn 23 | Sandnes |
3 | Pettersen | Kari | Storgt 20 | Stavanger |
Now we want to select the content of the columns named "LastName" and "FirstName" from the table above.
We use the following SELECT statement:
SELECT LastName,FirstName FROM Persons |
The result-set will look like this:
LastName | FirstName |
---|---|
Hansen | Ola |
Svendson | Tove |
Pettersen | Kari |
Now we want to select all the columns from the "Persons" table.
We use the following SELECT statement:
SELECT * FROM Persons |
Tip: The asterisk (*) is a quick way of selecting all columns!
The result-set will look like this:
P_Id | LastName | FirstName | Address | City |
---|---|---|---|---|
1 | Hansen | Ola | Timoteivn 10 | Sandnes |
2 | Svendson | Tove | Borgvn 23 | Sandnes |
3 | Pettersen | Kari | Storgt 20 | Stavanger |
Most database software systems allow navigation in the result-set with programming functions, like: Move-To-First-Record, Get-Record-Content, Move-To-Next-Record, etc.
Programming functions like these are not a part of this tutorial. To learn about accessing data with function calls, please visit our ADO tutorial or our PHP tutorial.
From http://www.w3schools.com (Copyright Refsnes Data)