Inser into table data

I have to insert into table data. Can you tell me how to insert rows in table?
I have code:

[code=php]

$query = “insert into sales
values (1,345,100,800)”;

$query = “insert into sales
values (2,445,200,740)”;

$query = “insert into sales
values (3,945,300,680)”;

$query = “insert into sales
values (4,1145,400,697)”;

mysql_query ($query,$link)
or die (“Insert error:”.mysql_error());
mysql_close ($link);
[/code]

But it will put in table just last row. how to do that it will put all data?

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