I would really appreciate your help on this:
Item_ID Buy_User Buy_Date Buy_Qty
00001 Adam 01/02/2013 1
00003 John 01/01/2013 2
00004 Peter 02/01/2013 1
00001 Nial 01/01/2013 1
Above is an example of my table. What I need is to sql query the Item_ID column, and display each Item_ID only once - but display each of the user's who have bought that product.
I need the query to be outputted in HTML/css.
For example my html page may look like:
Item 1: Adam bought 1. Nial bought 1.
Item 2: (would be hidden as no purchases).
Item 3: John bought 2.
Item 4: Peter bought 1.
I'm not quite sure how to achieve this, I've been googling around and found multiple mentions of sub selects, but i'm not sure how i'd get it to display each row?
Help?!
Many thanks.
Is this what you're looking for? It uses GROUP_CONCAT to group the rows and CONCAT to build the strings:
SELECT Item_Id, GROUP_CONCAT(CONCAT(Buy_User,' bought ',Buy_Qty) SEPARATOR ', ') ITEMS
FROM Items
GROUP BY Item_Id
Here is the SQL Fiddle.
And here are the results:
ITEM_ID ITEMS
00001 Adam bought 1, Nial bought 1
00003 John bought 2
00004 Peter bought 1
Related
I have a table like:
id name children
1 Roberto Michael,Dia
2 Maria John,Alex
3 Mary Alexandre,Diana
My problem is;
I want to find who has a child named Alex.
I can't use "where children = 'Alex'" in SQL because I have more than one names in same cells.
So I use "where children LIKE '%Alex%'" - that looks smart but
in the same time i get all start like Alex :( Alexandre
or i want to get dia but result is dia and diana :(
how can I get single Alex in that data type?
I hope I can explain my problem with my terrible english :D
The best solution would be to normalize your schema. You should have a separate table with one row for each child, instead of a comma-delimited list. Then you can join with this table to find parent with a specific child. See #themite's answer for an example of this.
But if you can't do that for some reason, you can use FIND_IN_SET:
WHERE FIND_IN_SET('Alex', children)
You should split the data into two tables.
the first would look like this
ID Name
1 Roberto
2 Maria
3 Mary
And the second like this
ParentId child
1 Michael
1 Dia
2 John
2 Alex
and so on.
then you could do the query you want without having to worry about like and your data is much more useable
That's why you'd want to have two tables here.
parents:
id name
1 Roberto
2 Maria
3 Mary
children:
id parentid name
1 1 Michael
2 1 Dia
3 2 John
4 2 Alex
5 3 Alexandre
6 3 Diana
And now you can query this much more effectively with a join or an exists:
SELECT *
FROM Parents
WHERE EXISTS(
SELECT *
FROM Children
WHERE parentid=Parents.id
AND Children.name='Alex'
)
I would rather make different tables for children and parents something like this.
Table for parents
parent_id name
1 Roberto
2 Maria
3 Mary
Table for children
children_id parent_id name
1 1 Michael
2 1 Dia
3 2 John
.... and so on
I have a table like:
id name children
1 Roberto Michael,Dia
2 Maria John,Alex
3 Mary Alexandre,Diana
My problem is;
I want to find who has a child named Alex.
I can't use "where children = 'Alex'" in SQL because I have more than one names in same cells.
So I use "where children LIKE '%Alex%'" - that looks smart but
in the same time i get all start like Alex :( Alexandre
or i want to get dia but result is dia and diana :(
how can I get single Alex in that data type?
I hope I can explain my problem with my terrible english :D
The best solution would be to normalize your schema. You should have a separate table with one row for each child, instead of a comma-delimited list. Then you can join with this table to find parent with a specific child. See #themite's answer for an example of this.
But if you can't do that for some reason, you can use FIND_IN_SET:
WHERE FIND_IN_SET('Alex', children)
You should split the data into two tables.
the first would look like this
ID Name
1 Roberto
2 Maria
3 Mary
And the second like this
ParentId child
1 Michael
1 Dia
2 John
2 Alex
and so on.
then you could do the query you want without having to worry about like and your data is much more useable
That's why you'd want to have two tables here.
parents:
id name
1 Roberto
2 Maria
3 Mary
children:
id parentid name
1 1 Michael
2 1 Dia
3 2 John
4 2 Alex
5 3 Alexandre
6 3 Diana
And now you can query this much more effectively with a join or an exists:
SELECT *
FROM Parents
WHERE EXISTS(
SELECT *
FROM Children
WHERE parentid=Parents.id
AND Children.name='Alex'
)
I would rather make different tables for children and parents something like this.
Table for parents
parent_id name
1 Roberto
2 Maria
3 Mary
Table for children
children_id parent_id name
1 1 Michael
2 1 Dia
3 2 John
.... and so on
I could not find an answer by searching as I am not sure what exactly it would be called what I'm searching for.
Anyways, I have multiple tables in MySQL and am trying to "fill in" some of the final product.
myTable
id assigned_to location
1 2 3
2 2 3
3 3 3
myUsers
id name
1 John
2 David
3 Sally
myLocation
id name
1 SAT
2 DEN
3 AUS
Basically the end product should pull the "myTable" data and fill into a table (which I already know how to do) the name and location of each row/column so that it states something alongm the lines of
ID Assigned To Location
1 David SAT
Instead of
ID Assigned To Location
1 2 2
This should produce the expected result:
SELECT mt.id, mu.name, ml.name
FROM mytable mt JOINT myUsers mu ON mt.assigned_to = mu.id
JOIN myLocation ml ON mt.location = ml.id
I am looking to make PHP code that selects the best option in a data table. What is considered "best" would be based off of the variables/columns. I understand that I would need to start a mysqli query and create a couple of loops to search through the database, but I am not entirely sure how to implement something like this.
To give a more in-depth explanation of what I am talking about, here as an example.
(START EXAMPLE)
Lets say I have a database and there is a table with items in it. There are 3 columns: Item ID, Type, On Sale. I want to make it so that a user is able to pick out the best option based on those variables. In addition to finding the "best" option, it selects the one that is first listed in that order (in this case lowest Item ID).
Imagine this table:
Item ID | Type | On Sale
---------------------
1 | Chair | 0
2 | Table | 1
3 | Chair | 1
4 | Oven | 0
5 | Table | 1
6 | Oven | 0
The level of important goes like Type>On Sale>Item ID (lowest).
A user is looking for a chair. Item 3 is selected because it is his item and it is the first one also on sale.
A user is looking for a table. Item 2 is selected over Item 5 because it is listed higher (or in this case, has a lower Item ID)
A user is looking for an oven. Item 4 is selected because no ovens are on sale. Because no options are on sale, it selects the lowest Item ID of the ovens listed.
(END EXAMPLE)
So how should I go about this? Any answers would be greatly appreciated!
select * from table_name where Type = type_specified_by_user order by On Sale, Item ID
I have a table like:
id name children
1 Roberto Michael,Dia
2 Maria John,Alex
3 Mary Alexandre,Diana
My problem is;
I want to find who has a child named Alex.
I can't use "where children = 'Alex'" in SQL because I have more than one names in same cells.
So I use "where children LIKE '%Alex%'" - that looks smart but
in the same time i get all start like Alex :( Alexandre
or i want to get dia but result is dia and diana :(
how can I get single Alex in that data type?
I hope I can explain my problem with my terrible english :D
The best solution would be to normalize your schema. You should have a separate table with one row for each child, instead of a comma-delimited list. Then you can join with this table to find parent with a specific child. See #themite's answer for an example of this.
But if you can't do that for some reason, you can use FIND_IN_SET:
WHERE FIND_IN_SET('Alex', children)
You should split the data into two tables.
the first would look like this
ID Name
1 Roberto
2 Maria
3 Mary
And the second like this
ParentId child
1 Michael
1 Dia
2 John
2 Alex
and so on.
then you could do the query you want without having to worry about like and your data is much more useable
That's why you'd want to have two tables here.
parents:
id name
1 Roberto
2 Maria
3 Mary
children:
id parentid name
1 1 Michael
2 1 Dia
3 2 John
4 2 Alex
5 3 Alexandre
6 3 Diana
And now you can query this much more effectively with a join or an exists:
SELECT *
FROM Parents
WHERE EXISTS(
SELECT *
FROM Children
WHERE parentid=Parents.id
AND Children.name='Alex'
)
I would rather make different tables for children and parents something like this.
Table for parents
parent_id name
1 Roberto
2 Maria
3 Mary
Table for children
children_id parent_id name
1 1 Michael
2 1 Dia
3 2 John
.... and so on