Determining Which Table To Query Based On Data Within Tables
I have 2 tables:
default_categories
column 1: category_id
column 2: category_name
column 3: category_parent
custom_categories
column 1: custom_cat_id
column 2: custom_cat_name
column 3: custom_cat_parent
The custom_categories table won't necessarily have anything in it but if it does, I need to choose the data from the custom_categories table over the data from the default_categories table.
So if the default category has 3 rows with IDs | names:
123 | Dogs
456 | Cats
789 | Fish
And the custom category has 1 row with IDs | names:
456 | Very Cute Cats
I want my query of these 2 tables to produce the following IDs | names:
123 | Dogs
456 | Very Cute Cats
789 | Fish
I've tried joins like the one below but they aren't working because if there is no custom_cat_id, it won't give me the result for the default category_id.
MySQL
SELECT *
FROM default_categories
LEFT JOIN custom_categories ON category_id = custom_cat_id
WHERE category_parent = ''
AND custom_cat_parent = ''
ORDER BY $order_by $sort
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Essentially this is what i want to do. I have two Tables, Table A- has the field "id" which is the primary key Table B- has the field "id" which is the primary key Select * from tableA where Table A.id is not in tableB.id How can i form a statement that will accomplish the above.
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Determining Number Of Days
I'm trying to determine the number of days between today and the value in a datetime field in a table. It appears my version of MySQL doesn't have DATEDIFF available, so I'm wondering if there's another method to achieve the same result as: SELECT DATEDIFF(CURDATE(),`mydate`) AS numdays FROM tblArticles WHERE artid = 10 .
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Determining Future Dates
I have a mysql statement Code: $result1 = mysql_query("SELECT *, UNIX_TIMESTAMP(startingdate) as startingdate FROM whatsuplistings where MONTH(startingdate) >= '$currentmonth' and YEAR(startingdate) >= $currentyear and sectionid= 2 order by startingdate asc ") or die("Couldn't ececute query.".mysql_error()); This works for the current year, but I cant seem to get this to work if the year is 2005 because the current month which is 10 is smaller than the first month which is 1 in 2005.
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Determining Which Age Ranges Have People In Them
Making up another example here since it makes things clearer for everyone. I have a people table. One of the fields in there is 'age' (as an integer). I want to output a series of links like the following: People by age: 21-30 31-40 51-60 Each range would be a link to a listing of people in that age range. They stumbler for me is that I want to only show age ranges that have people in the table in that age range. So above, the 41-50 range didn't show up because nobody in the people database had an age in that range. I don't know how to do this without 10-11 queries each checking a range and counting the numrows returned. And I just know if I hardcode the last year to 150, there will suddenly be a need for a 151-160 range. Any elegant way to do this without a loop or a dozen+ queries?
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