There are two ways to provide NULL value to a column in an INSERT statement:

* Include the column in the statement, but specify keyword NULL as the value.

* Exclude the column from the statement.

The following tutorial exercise inserts two rows. Both of them have NULL values. But they were inserted differently:

<?php

$con = mssql_connect('LOCALHOST','sa','GlobalGuideLine');

mssql_select_db('GlobalGuideLineDatabase', $con);

$sql = "INSERT INTO ggl_links"

. " (id, url, notes, counts, time)"

. " VALUES (101, 'www.GlobalGuideLine.com',"

. " NULL, NULL, NULL)";

$res = mssql_query($sql,$con);

if (!$res) {

print("SQL statement failed with error: ");

print(" ".mssql_get_last_message()." ");

} else {

print("One data row inserted. ");

}

$sql = "INSERT INTO ggl_links (id, url) VALUES ("

. " 102, 'www.GlobalGuideLine.com')";

$res = mssql_query($sql,$con);

print("Another data row inserted. ");

mssql_close($con);

?>

If you run this script, you will get:

One data row inserted.

Another data row inserted.