如何结合两个独立的mysql查询

Question

What is the correct syntax for combining these mysql queries?

$reserved = mysql_query("Select * from reservations where $timestamp >= ReservationStart AND $timestamp <= ReservationEnd");

and

$reserved2 = mysql_query("Select * from reservations where $ReservationEnd >= ReservationStart AND $ReservationEnd <= ReservationEnd");

I would like the reservation to meet both of these criteria but I am quite new to using mysql (and I know it's deprecated, but for the purpose of what i'm using it is easier), so i'm not sure how to put these two together.

Answer 1

Combine the WHERE clauses with AND . You can also use the BETWEEN operator instead of testing both >= and <= .

$reserved = mysql_query("Select * 
    from reservations 
    where $timestamp BETWEEN ReservationStart AND ReservationEnd
    AND $ReservationEnd BETWEEN ReservationStart AND ReservationEnd") or die(mysql_error());

Answer 2

I found the reason why the query wasn't working.

It was simply because the syntax for the query was wrong, as I needed the inverted commas around the variables for it to work properly, like this:

$reserved = mysql_query("Select * from reservations where '$timestamp' BETWEEN ReservationStart AND ReservationEnd AND '$ReservationEnd' BETWEEN ReservationStart AND ReservationEnd