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Posted by "Mark Rees" on 09/15/05 11:21
On Wednesday 14 September 2005 07:36 pm, Jesϊs Alain Rodrνguez Santos wrote:
> I have a table colum in mysql with two fields: day and month. I
> would like to know if it's possible to make a query where I can
> determine if exist days before to a selected day, for example:
> if I have in my table:
> day 19 - month 05, I wish to know if there are previous days
> inserted at the 19, the days they are not inserted in the table,
> they are inserted according your selection, what I want to get is
> that every time that you insert a day, I want to check if there
> are days previous to the one already inserted in the table in the
> same month, in case that there are not them then they owe you
> to insert together with the one selected,
I haven't tried this, but the logic should work according to the manual:
You don't have to check, you can just insert all the data. If the row
already exists, the data will not be inserted. This assumes that you have a
constraint on the table which prevents duplicate values!
$day=19;
$month=5;
for($i=1;i<=$day;i++){
$result=mysql_query("INSERT INTO table (month,day) VALUES (5,$i)");
}
If you don't have a constraint, then you will have to loop over the data for
that month and insert the rows where they don't already exist.
> I wait they understand me what I want:
> I work php/mysql.
create table tableA (
day int,
month int
);
select * from tableA where month=5 and day < 19;
This will select everything from the 5th month and before the 19th day of
the
5th month.
Is that what you were going for?
>
> sorry for my english i'm cuban
> Thank you and excuse the nuisances
>
>
>
> --
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