After looking into this, apparently it's a complex thing to do? It doesn't look like it's a pivot query, or should it be?? Anyway, two tables like this:
articles:
id col2 col3
1 .... ....
2 .... ....
3 .... ....
articleImages:
id imgFile artRef
1 img1.jpg 1
2 img2.jpg 1
3 img3.jpg 2
4 ....... 3
5 ....... 3
6 ....... 3
I want to select everything form "articles" and combine the "articleImages" into the row so it will look something like this:
[{
"id":"1",
"col2":"...",
"col3":"...",
"imgFiles":{
"img1.jpg",
"img2.jpg"
}
},{
"id":"2",
"col2":"...",
"col3":"...",
"imgFiles":{
"img3.jpg"
}
},{
"id":"3",
...etc.
}]
I tried:
"SELECT art.*, ai.imgFile FROM articles art LEFT JOIN articleImages ai ON art.id = ai.artRef ORDER BY art.id desc LIMIT $lim, $limit"
And that's wrong...I got separate rows for each image. It's not a LEFT JOIN...what's the syntax for this? Or is there a more optimal way of organizing the table? I didn't want to make an "articleImages" column and concatenate inside "articles"...
If I got your goal correctly you can group your query and use GROUP_CONCAT function to get all coma separated img names in one field:
SELECT art.*,
GROUP_CONCAT(ai.imgFile) imgFiles
FROM articles art
LEFT JOIN articleImages ai
ON art.id = ai.artRef
GROUP BY art.id
ORDER BY art.id desc
LIMIT $lim, $limit
Related
i have a database name category
parent_cat cat_id title
0 1 fruit
0 2 vehicle
0 3 goods
1 4 sour
1 5 sweet
1 6 mixed
2 7 sedan
2 8 hatchback
2 9 car
and i store a object in database table name product
obj_name parent_cat sub_id
mango 1 4,5,
maruti 2 7,8,9
bmw 2 7,9
i want to join the two table to show the data so i need to pass the parameter in URL ie. ?obj=vehicle i got by doing sql query
SELECT category.cat_id,category.title,product.parent_cat,product.obj_name
FROM category, product
WHERE category.cat_id=product.parent_cat
AND category.title='$title' --is a difined get variable
if title=fruit i got "mango" if title=vehicle i got maruti and bmw
i want to know if title=sedan or title=car then how can i get maruti and bmw
through loop any solution
You might want to use a LEFT JOIN query, if you have comma separated values for title use IN()
SELECT a.cat_id, a.title, b.parent_cat, b.obj_name
FROM product b
LEFT JOIN category a
ON a.cat_id = b.parent_cat
WHERE a.title IN($title);
Try this:
SELECT category.cat_id, category.title, product.obj_name, product.parent_cat, product.sub_id FROM category
LEFT JOIN product ON category.cat_id = product.parent_cat OR category.cat_id LIKE '%product.sub_id%'
WHERE category.title LIKE '%$title%'
Use LIKE instead of = when you're not sure of the exact data you're comparing or looking for.
[UPDATE]
SELECT category.cat_id, category.title, product.obj_name, product.parent_cat, product.sub_id FROM product
LEFT JOIN category ON (product.parent_cat = category.cat_id OR product.sub_id LIKE '%category.cat_id%') AND category.title LIKE '%$title%'
I'm joining the table in wrong direction, sorry for that.
I am still a php/mysql newbie and I am working on mysql table relationship concept and i am having an issue with using mysql count in multiple table. Here is my db structure.
**product table**
id product_name product_img groupeid
1 Sneaker Mark sneaker_adi.png 1
2 bag Eric bageric.png 2
3 Sneaker Etoi sneakeretoi.jpg 1
**groupe table**
group_id group_name
1 men
2 women
**category table**
catid catname
1 sneaker-shoes
2 bag-woman
**productcategory table**
prod_id cat_ID
1 1
2 2
3 1
What i want to do is to determine the number of sneaker-shoes using mysql.
We can see that the number of sneaker-shoes in the db is 2.
But how can i use **count()** in these multiple tables.
I tried like this;
$sql = "SELECT COUNT(*) product.id,product_name,catname FROM product INNER JOIN productcategory ON product.id = prod_id INNER JOIN category ON catid = cat_ID WHERE catname='sneaker-shoes'";
i got error like:
Fatal error: Call to a member function execute() on a non-object in C:\wamp\www\kbashopping\Homme\index.php on line 32
Hope i exposed the issue clearly, any help and assistance will be appreciate
Thanks
If you are looking only for the count, mention only the count phrase in the Select clause.
Change :
SELECT COUNT(*) product.id,product_name,catname FROM
to :
SELECT COUNT(product.id) FROM
SELECT count (pc.cat_ID) FROM productcategory pc inner join category c on c.catid = pc.cat_ID where c.catname = 'sneaker shoes';
This will build a temporary table in mysql that joins category and product category but only including results where the catname is sneaker shoes. Then it selects a column to run the count operation on, and returns the result of count.
I have three tables where table_2 is the middle(connected) between table_1 and table_3
tables
table_id
...
...
table_rest
rest_id
table_id
...
rest
rest_id
...
...
And the query to select I use
SELECT m.table_id, table_name
FROM tables m
JOIN table_rest mr
ON m.table_id = mr.table_id
WHERE rest_id = '$rest_id'
What I need now is to join in this query another table reserv
id
...
status
To check if status is 0, 1,or 2 to not show me anything if there is no status this mean there is no record to show me. In other words this is resserved system where I show on screen few tables. If status is 0,1,2 thats mean the table is taken. If nothing is found for status this mean that there is no record for table and can be shown to user.
EDIT: Sample scenario
tables
table_id
1
2
3
4
5
rest
rest_id
1
2
table_rest
table_id | rest_id
1 2
2 2
3 2
4 2
5 2
So the query that is above will generate 5 tables for rest_id=2 and none for rest_id=1
So now I have another table
reserv
id | status
1 0
2 1
3 2
So in this table reserv currently are saved 3 tables. The idea is to show me other two whit id=4 and id=5 because they are not in table reserv and don't have any status.
Hope is a little bit more clear now.
You have to point from table reserv to which table is beign booked, let's call it reserv.table_id
SELECT m.table_id, table_name
FROM tables m
JOIN table_rest mr
ON m.table_id = mr.table_id
left join reserv
on reserv.table_id = m.id
WHERE rest_id = '$rest_id'
and reserv.status is null (*note)
*note use 'is' or 'is not' depending of your needs, as far as I read, first seems that you want !=, later that what you want is =
It's better if you provide sample data or sqlfiddle. Based on what I realize: Is this what you want:
select tables.table_id, rest.rest_id
from tables
left join table_rest on table_rest.table_id = tables.table_id
left join rest on rest.rest_id = table_rest.rest_id
where rest.rest_id = '$rest_id'
and tables.table_id not in (select id from reserv)
I have a Table table .
Now this has three columns table_id,content_id,content_type
What i want is to SELECT rows based on unique pairs of columns.
Say For example i have rows like this-->
id|content_id|content_type|
1 1 shirt
2 1 trouser
3 4 skirt
4 4 shirt
5 3 trouser
6 5 jeans
7 1 trouser
8 5 jeans
I want a query which selects Rows with id->1,2,3,4,5,6.
Rows with id->7,8 are not to be selected
Therefore it concludes that i dont want to select complete Duplicates of Rows
You can use a self join to pick a minimum row per group
select t.* from
test t
join (
select min(id) id ,content_id,content_type
from test
group by content_id,content_type
) t1
on(t.id = t1.id
and t.content_id = t1.content_id
and t.content_type = t1.content_type)
Demo
or if there are only these 3 columns in your table then you can simply use min()
select min(id) id ,content_id,content_type
from test
group by content_id,content_type
Demo
This is mysql-specific : If you use the GROUP BY function without using aggregate functions, the group by clause will behave as distinct, and pick up the first distinct row.
select id, content_id, content_type from test group by content_id, content_type order by id
Demo
I've got two tables:
content:
id access
1 3
2 5
3 9
viewlevels:
id group
1 [10,12,15]
2 [8,12,11]
3 [9,10,5]
The access field in content is related with the id field in viewlevels.
I select the rows in viewlevels depending on the current user group. So for example, if group is = 10, my query will select rows 1 and 3. If the group is 12, it will select rows 1 and 2, etc. I'm using the following query:
$query="SELECT id FROM #__viewlevels WHERE rules LIKE '%$group%'";
My challenge is to count the number of rows for column id in table content where the access matches with the selected id's from the above query on table viewlevels.
I tried the following code but it is returning the error: undefined variable: nartigos
$query="SELECT count(id) FROM #__content WHERE access IN (SELECT id FROM #__viewlevels WHERE rules LIKE '%$group%')";
if ($stmt = mysqli_prepare($link, $query)) {
/* execute query */
mysqli_stmt_execute($stmt);
/* store result */
mysqli_stmt_store_result($stmt);
$nartigos=mysqli_stmt_num_rows($stmt);
/* close statement */
mysqli_stmt_close($stmt);
};
echo "Nº de artigos " .$nartigos;
First of all, you really should normalize your data. Consider having a many-to-many join table for viewLevels instead of having all groups in one row. That might look like this:
access_id group_id
1 10
1 12
1 15
2 8
2 11
2 12
3 5
3 9
3 10
That would make your query as simple as
SELECT c.id AS `content_id`, COUNT(v.access_id) AS `content_count`
FROM content AS c INNER JOIN viewLevels AS v
ON c.access_id = v.access_id
WHERE v.group_id = ?
GROUP BY c.id
Here ? is the group id you are querying against.
Without normalization (which again I STRONGLY recommend you do), you would still use a join, but it would look like this:
SELECT c.id AS `content_id`, COUNT(v.access_id) AS `content_count`
FROM content AS c INNER JOIN viewLevels AS v
ON c.access_id = v.access_id
WHERE v.group LIKE '%?%'
GROUP BY c.id
you need to "join" your tables.
the sql command cant query two tables seperately.
when you "join" 2 tables in your sql, think of it as making one virtual/temporary table in the air, of the 2 tables which you can then query.
this is quite a good intro http://www.sitepoint.com/understanding-sql-joins-mysql-database/