在 where 子句中使用两组条件

Question

I'm trying to get the count of items in my table where it should satisfy these conditions

status = active
type = Pre-order
date = $date_input

OR

status = active
type = Both
date = $date_input

I'm trying to use this statement but I'm pretty sure it's messed up.

SELECT COUNT(id) as count_date from date_restriction
where (date='$date_input' AND status='active' AND type='Pre-order') 
OR (date='$date_input' AND status='active' AND type='Both')

I also tried this to no avail

SELECT COUNT(id) as count_date from date_restriction
where date='$date_input' AND status='active' AND type='Pre-order' OR type='Both'

Answer 1

Whe you have mixed AND and OR condition you need () for the or clause

SELECT COUNT(id) as count_date 
from date_restriction
where date='$date_input' 
AND status='active' 
AND ( type='Pre-order' OR type='Both')

or instear of several or condition you could use a IN clause

 AND  type IN ('Pre-order', 'Both')

anyway you should avoid the use of php var in SQL you are at risk for sqlinjection.. for avoid this you should take a look at prepared statement and binding param for your db driver

Answer 2

Your code should work. I would write this as:

select count(*) as count_date
from date_restriction
where date = ? AND status = 'active' AND
      type in ('Pre-order', 'Both');

Note: The ? is for a parameter so you are not munging the query string with input values.

If I had to guess why this isn't working, I would speculate that one or both of the dates have a time component. You might try:

where date(date) = date(?) . . . 

to be sure you are matching on the date, regardless of time.

Answer 3

SELECT count(id) as count_date FROM date_restriction WHERE date='$date_input' AND status='active' AND (type='Pre-order' OR type='Both'); Here, date and status both fields are common in your case; hence, don't wrap it in parenthesis whereas, add OR condition for type field only and con-cat it with AND in WHERE clause.