I have a product page which displays a user's comment, name and rating of the particular product. These values are stored in my data base as such "Id, name, comment, rating"
Now I find myself struggling if I want to store comments,name and rating from all product pages into one table as the output would display comments, name and ratings on every page which I don't want.
Am I correct in trying to pursue this one table theory? Or should I just go ahead and make a seperate table for each product page?
Your comments can go in a single table, you should however store the identifier of the product, so you can filter the comments. Example:
+------------+------------+------+-----------------+
| comment_id | product_id | name | comment |
+------------+------------+------+-----------------+
| 1 | 1 | john | Cool product! |
| 2 | 2 | jack | Don't like this |
| 3 | 1 | jack | Nice! |
...
Now if you want to display all comments for the product with id 1, you would execute this query:
SELECT * FROM `comments` WHERE `product_id` = 1
There you go! You have john's comment, and jacks comment which says "Nice!"
Related
I have two tables where some same kind of information kept. One table has approved information and other one contains pending(waiting for approval) data. I fetch data from both table and display in a same view. So user will see data from both the tables. User can delete those records. But when deleting I've a trouble with finding out which table I should delete.
Assume, table1(Approved info), table2(Pending info)
table1
id | name | description | creator |
-----------------------------------
10 | test1 | N/A | 100 |
11 | test2 | N/A | 100 |
12 | test3 | N/A | 101 |
13 | test4 | N/A | 200 |
table2
id | name | description | creator |
-----------------------------------
10 | test1 | N/A | 105 |
11 | test2 | N/A | 103 |
12 | test3 | N/A | 106 |
13 | test4 | N/A | 202 |
table1 has a record with id of 10; and table2 has a record with id of 10 in that table. Id is the primary key of both tables. Both record will show to user. Let's say user wants to delete the record related to id 12 came from table2. So I want to delete that record from table2. But how can I figure out which table to delete that record. Because I can't use id to figure out the table. I have tried using some kind of data attribute attached with
data coming from table2 to differentiate them. But anyone can change them by inspecting it. So what is the proper way for solve this issue?
On any case, on any system, makes sense to have two to tables with same columns. That should be one of the firsts rules of database design. What's more, you discovered yourself how hard is to maintain a design like that. I see this on legacy systems developed with zero love to the code. In the future this will turn into a snowball. You should change it as soon as possible.
status column
The status of and entity or resource, is classic requirement, usually implemented with one little column which called : status, flag, mode, etc. In your case, it could have these values (#BhaumikPandhi comment):
pending/approved/rejected
id | name | description | creator | status |
--------------------------------------------
10 | test1 | N/A | 100 | pending|
If you are worried to the database optimization, you could use a tinyint with these equivalence in your documentation:
1 = pending
2 = approved
3 = rejected
status table
You could keep your first table called record
id | name | description | creator |
And create another one called record_status with 2 columns, in which record_id is a FK of record table
record_id | status |
Anyway, the status column is the most easy a classic approach to your requirement.
I'm trying to wrap my head around designing my database which will store one or more preferences for many categories for each user. So in other words, each user can select one or more options from the Colors category, one or more options from the Shapes category, and so on.
My initial thought was to first have a User table with generic user information. Next, there would be a table to store all the different categories as so:
CATEGORY_ID | CATEGORY_VALUE
--------------------------------
1 | Colors
2 | Shapes
3 | Sizes
I'd separate each Category into it's own table (Colors for example):
OPTION_ID | OPTION_VALUE
------------------------------
1 | Red
2 | Blue
3 | Green
Finally, I would have a User Preferences table:
USER_ID | CATEGORY_ID | OPTION_ID
----------------------------------------
1 | 1 | 2
1 | 1 | 3
1 | 3 | 2
2 | 1 | 3
Am I on the right track here or is there a better/more efficient way to designing this. I will be setting up a search results page which will allow visitors to filter through these different categories.
Thanks!
I'm bending my mind for some time now over this problem. Could someone please help me?
I have two tables: products and product_attributes. The product has all basic product information and product_attributes has all specific information for products on different categories. It's much like the magenta attribute system. this table has 4 columns: id, product_id, attribute_name, attribute_value.
Now let's say a product has 2 attributes:
------------------------------------------------------
| id | product_id | attribute_name | attribute_value |
------------------------------------------------------
| 1 | 123 | length | 123cm |
------------------------------------------------------
| 2 | 123 | material | Denim |
------------------------------------------------------
| 3 | 123 | season | Summer |
------------------------------------------------------
Now if I set up the eloquent relationships and query a product, I get a product object with all three attributes. So far this is what I wanted. But now in a blade template I would like to be able to do something like this:
$product->attribute->length
Is this even possible or do I need to achieve these kind of things with a total different approach (like creating different tables for different product types/categories)?
Thanks in advance!
length is a tuple value not an attribute you need
$product->attribute->where('attribute_name', 'length')
or
$product->attribute->whereAttributeName('length')
I have a orders table with the following columns:
-userid
-orderid (primary key)
-date
-name
-qty
So I would like to display in tables in a summary page all orders and group them under each userid. So it would be like
Userid: 0001
| Orderid | Name | QTY |
| 1001 | Item A | 10 |
| 1002 | Item B | 5 |
Userid: 0003
| Orderid | Name | QTY |
| 1003 | Item C | 6 |
| 1004 | Item C | 7 |
So far I've experimented and got:
display in a single table all the items ordered by userid
with a GROUP BY userid, I've managed to create as many tables as there are different userid
But I can't seem to combine the two into the desired results and would really appreciate some advice on what I am doing wrong.
Thanks in advance and I hope my explanation made sense!
I think you will need to do this in PHP
Query with
select * from orders order by userid, orderid
In PHP something like this psudo code
$this_user_id=0;
for (each order line)
{
get fields from db result;
if ($this_user_id!=$userid)
{
$this_user_id=$orderid// save change of userid flag
print user heading;
}
print order lines;
}
I wish to update one table in my database, the data is from a php POST. (It is a page where multiple edits on rows can take place at once, then it processes them all at once after) and i want it so for each "row" or "loop", it builds a single query that can update all the rows at once.
What i want to do, is in the query, select data from two other tables.
E.g
Posted data:
- Task = "Check current Sponsors"
- User Assigned = "Dan"
- Start Meeting = "Mar 1st"
- Meetings Required = 2
And for User Assigned, i want it to basically do this query:
SELECT id FROM team WHERE fullname LIKE 'Dan'
And for the start meeting, i want it to do this query:
SELECT id FROM meetings WHERE starttime='".strtotime("Mar
1st")."'
-- strtotime() makes a unix timestamp from a string.
but i want it to do that for each "task" that gets submitted. (It is queued up via javascript and it sends them all into the same post request)
Anyone have any ideas on how to do this?
Thanks in advance
Table Structures:
Tasks:
id | startmid | length | task | uid | completed
1 | 2 | 1 | Check Sponsors | 1 | 0
Meetings: (Joined by startmid)
id | maintask | starttime | endtime
1 | Sponsors | 1330007400 | 1330012800
Team: (Joined by uid)
id | fullname | position | class | hidden
1 | Team | All Members | black | 0
2 | Dan S | Team Manager | green | 0
you can use the following construct:
UPDATE mytable( col1, col2 )
SELECT col1_val, col2_val
FROM someothertables
WHERE cond1 = cond1;