I need to be able to pinpoint a value in a MySQL table which is defined by two variables.
On the frontend of the site, there is a form which accepts a variety of fields. For this example let’s focus on these two:
Account Number
Account Name
I have developed a script which will use an ajax script to check the “Account Number” once entered and if it finds a match will display the “Account Name” when the user tabs out of the field.
The difficulty is to find a single result from the format of the database tables. For example:
”SELECT * FROM example_table WHERE name=’$accountnumber’”
Provides a list of all the values that equal the account number, but does not provide any record of the account name.
”SELECT * FROM example_table WHERE name=’$accountname’”
Provides a list of all the values that equal the account names, but does not provide any record of the account number.
The $record value is the only common thread between $accountnumber and $accountname.
So all in all, I need assistance creating the loop which can first take the $accountnumber value to find the $record value associated with that number. Secondly it will take the determined $record value and match it to the $accountname value. There is only one $accountnumber and $accountname value per unique $record value.
UPDATED: There have been several good comments on this question. To help provide more background, there is only one table. The best discriminator available seems to be the title value. Here is a link to the table snippet to view in greater detail:
https://docs.google.com/file/d/0By2lFlhEzILjbE1uT1hkVURmczA/edit?usp=sharing
So ultimately in this sample, a user would type 246802 and the result that is filtered out would be Fred’s Account.
Sounds like these are in the same table? Is there any discriminator to tell you whether name holds an accountnumber or accountname?
In any even, with the following assumptions you could try an ugly self join:
There are only two records with the record ID you want
these are multiple columns in the same table holding different information in the ambiguous column names
there is no better way to discriminate the record type
If so, something like this self-join should get you started:
SELECT t2.name as accountnumber from example_table as t1
INNER JOIN example_table as t2 on t1.recordID=t2.recordID
WHERE t1.name='$accountname'
EDIT Note - if my assumptions are correct and if this is data you are inheriting, I feel for you and you should look to improve it's structure. If you are designing it like this, you may want to think about it some more first.
EDIT 2
You probably want to put an index on the name column (this is the discriminator I would used based on your example).
Your query can be something like this:
SELECT t1.value as accountnumber,t2.value as accountName from example_table as t1
INNER JOIN example_table as t2 on t1.record=t2.record
WHERE t1.name='accountNumber' and t2.name='accountName'
See this SQL Fiddle: http://www.sqlfiddle.com/#!2/97c2f/1
Related
I need the least expensive way to check if my url slug is formed from the values from two separate columns from two separate tables.
I will use dummy example with stores and locations to make this more human readable.
I have the following url:
www.domain.com/store-location
This could be, for example:
www.domain.com/three-words-store-chicago or
www.domain.com/nicestore-new-york-or-some-neighbourhood-with-more-words or
www.domain.com/oneword-oneword
(you get the idea)
Stores are located in table called stores, and locations in the table called locations.
All the combinations are possible in theory.
So, I would need some clever mysql query combined with php which will check if my slug (what goes after .com/) is the exact combination of store+location. So, to make it more descriptive:
url: www.domain.com/cool-store-los-angeles
Check is there "cool-store" in the table stores.slug_stores and is there "los-angeles" in the table locations.slug_location. The number of words of both is undefined as you can see above, so I don't have any possible delimiter.
IT MUST BE THE LEAST EXPENSIVE WAY because both tables tables have around 1000 lines. PLEASE HELP AND THANK YOU GUYS!
ps. IMPORTANT: I MUSTN'T CHANGE URLS IN ANY WAY
Edit: This is real project, website. Depending on the url i.e. slug I return some view with data. So I need to check for www.domain.com/nicestore-nicecity if Nicestore and Nicecity exist in tables stores and locations, and if not, or if anything else is there like www.domain.com/nicestore-nicecityBLABLA to kill that page with 404. Otherwise, if there is Nicestore and Nicecity to return some page populated with related data. I tried so far to make separate table with formed slugs like "nicestore-nicecity" and to use it for queries "SELECT whatever FROM slugs WHERE whatever = 'nicestore-nicecity' and if there is line return whatever I need to show the page ... Simplified... But, this separate table is hard to maintain. If nicestore moves to uglycity, or if it changes name, or if you add a new store or new city. I hope I was more clear now ;-)
I'm assuming that you don't have any id values on which to JOIN your tables, and that you don't have the ability to create such values. In that case, since your store/location combination could be as short as oneword-oneword, the first and last words of the slug are about as much as you can search on. You can extract the start and end parts of the slug using SUBSTRING_INDEX and use that to narrow the set of matches in each table before you try and compare the whole string. In my example, I'm using an SQL variable to store the slug:
SET #store = 'cool-store-los-angeles'
SELECT *
FROM (SELECT *
FROM stores
WHERE store LIKE CONCAT(SUBSTRING_INDEX(#store, '-', 1), '%')) s
JOIN (SELECT *
FROM locations
WHERE location LIKE CONCAT('%', SUBSTRING_INDEX(#store, '-', -1))) l
WHERE CONCAT(s.store, '-', l.location) = #store
This will return all data associated with cool-store-los-angeles assuming that such a store exists.
Demo on dbfiddle
Here's what I know about your system...
You have a stores table with column slug_stores
You have a locations table with column slug_location
I'm going to assume that each table has an id column of some type. I'm also going to assume they have a many-to-many relationship using a third junction table, something like
CREATE TABLE store_locations (
store_id <type>,
location_id <type>,
PRIMARY KEY (store_id, location_id),
FOREIGN KEY (store_id) REFERENCES stores(id),
FOREIGN KEY (location_id) REFERENCES locations(id)
);
If you don't have this sort of relationship defined, I really don't know how you maintain your store locations.
What I would suggest is creating a VIEW to calculate and represent your URLs. For example...
CREATE VIEW store_location_urls AS
SELECT
sl.store_id,
sl.location_id,
CONCAT_WS('-', s.slug_stores, l.slug_location) AS slug
FROM store_locations sl
INNER JOIN stores s ON sl.store_id = s.id
INNER JOIN locations l ON sl.location_id = l.id;
Now you can use this view to do the following...
Check if a request URL slug is valid
SELECT store_id, location_id FROM store_location_urls WHERE slug = ?
If this returns a record, you can then further query the stores and locations tables for whatever extra data you need to render your page (or even just join them in the original query). Otherwise, use
http_response_code(404);
Get all the URL slugs for a particular store
SELECT slug FROM store_location_urls WHERE store_id = ?
Similarly, you could get all the URL slugs for a particular location
An extra note... due to concatenating strings, any indexes you have on stores.slug_stores and locations.slug_location will be useless with the above VIEW. The alternative is to use a real derived table (like what you currently have) and maintain it with triggers.
I think you can query like following in mysql and if do check in php afterwards. From your description, it doesn't sound like there is any join possible between those tables so, union is required, i think.
select col1,col2 from stores where slug_stores = ?
union
select col1,col2 from locations where slug_location = ?
I'm trying to add a function to a script that orders a list of users and then allows that same order SQL to be used to create an export file. I'm writing it for a piece of software that hosts basic user data in one table, and the question value I'm trying to get in another. Here's the details:
Table1 is base_user and from it I need the values of columns id, username, and email. However, I want to add the option to order/export by users with all that same data, but by their sex.
Table2 is base_question_data and from it I want to get the question 'sex' value.
Users can pick between Male or Female (Values: 1 or 2), and that info is stored in a column named intValue. I've already tried using INNER JOINS and such selecting multiple info from both tables, but where I'm getting confused is how to say "Get id, username, email, and sex for every user that is X sex" where "X sex" is the gender the user set to order/export by. I'm having a hard time figuring out how to get the specifics for the sex value for each user, but also use it to only show all those users of that value. All ideas are appreciated.
EDIT:
Forgot to mention that in the 'base_question_data' table, column 'userId' is equal to column 'id' in 'base_user' table.
This is Table1 or base_user
This is Table2 or base_question_data
To clarify what I'm trying to do:
In the 'base_user' table, I want to select ID, Username, and Email. I have this working normally, as it's a simple query. I want to, however, let users order by each user's gender. So
1)They can order the preview list by Male (questionName = sex intValue = 1) or Female (questionName = sex intValue = 2). This way, it will show all user's ID, Username, and Email who are gender 1 or 2. Using this same query, I'm trying to let them export that data as well, so they can export only users of gender 1 or 2.
My problem is the process of combining all of this data. I need to combine base_user's "id" to base_question_data's "userId" and I need to also get the value of each user by targeting base_question_data's questionName='sex' and get the intValue based on if they're ordering by Male (value=1) or Female (value=2).
I've done LEFT JOINS when combining one value to another for two tables, and while this is still two tables, I've never done it where I need to combine two different keys from two tables while also ordering them all by two different column values in one of those tables.
I agree with #rowmoin but if you use LEFT JOIN it will give null value if no entry in your base_question_data table and if you use INNER JOIN it will ignore those records from both tables which does not match so you can not get users from base_user if you do not have related entries in base_question_data table.
The query was easier than I anticipated. I will explain it in detail here.
To achieve something like this, (in which I needed one table's two values to decide what I'm getting in my other table results), I simply changed the value of 'intValue' in my query, but you can also do this by assigning a php value to let it be dynamically changed if you want. Since I'm doing a change between 1 or 2, I just have to different queries with the respective variable.
Here's my query:
SELECT * FROM ow_base_user
INNER JOIN ow_base_question_data ON ow_base_user.id = ow_base_question_data.userId
WHERE questionName='sex' AND intValue='$value';
I finally realized this morning I needed to go backwards, rather, and select my conditionals from base_question, rather than from the base_user table. Using this query, (where $value=1 for male or $value=2 for Female) I have successfully gotten to return a list of user's who match the set $value with their IDs, Username, and Email.
First of all I'm going to explain what I want to happen in the end so if you can't help me you don't waste your time reading all of this :)
I'm creating an API in which it outputs possible illnesses that a user could have, based on the symptoms they submitted.
I want the user to input something, this goes into the url as "symptom=...
like: .../nameofmyapi/data?symptoms=headache+dizzyness. I retrieve the data from the GET parameter, but I have absolutely no idea on how to output the name of the illness.
My database looks like this:
illness
illnessId (int(11), AUTO_INCREMENT)
illnessName(varchar(255))
symptom
symptomId (int(11), AUTO_INCREMENT)
symptomName (varchar(255))
illness_symptom
illnessId (from the illness table)
symptomId (from the symptom table)
This database design makes sure you dont get multiple values in 1 row and don't have the same values BUT like I said, I don't know how to "search" or "filter" illnesses based on values from the other table. Let alone having multiple symptoms to check on... seems impossible!
I've got this query though, so I can retrieve everything when the user did not input anything:
"SELECT illness.illnessId, illness.illnessName, symptom.symptomName FROM illness_symptom
JOIN illness
ON illness.illnessId = illness_symptom.illnessId
JOIN symptom
ON symptom.symptomId = illness_symptom.symptomId";
Which gives me this:
image
Like I said, I only want to output "Whiplash" when the url looks like this:/nameofmyapi/data?symptoms=dizzyness+headache
Help would be appreciated!
First off all: To only output 'Whiplash' is not going to work because your other illness is also connected to the symptom 'dizzyness'.
I've created a database with your structure (only renamed the fields to have more default convention. Would also look at your table names to pluralfy them) and came up with this query:
SELECT i.id, i.name
FROM illness_symptom AS ils
JOIN illness AS i ON i.id = ils.illness_id
JOIN symptom AS s ON s.id = ils.symptom_id
WHERE s.name IN ('dizzyness', 'headache')
GROUP BY i.name
The IN part searches through your table and filters out all the other results with different symptoms. You could convert the result from your GET query to a comma separated list used in the query.
The GROUP BY part makes sure you won't get any double results. Off course you need to make sure a result only exists in your DB once (no double records with different case like 'whiplaSh').
Hope this helps!
looking for guidance/assistance on PHP, MYSQL, HTML, Previously in all the code I've been given I'm very hack and slashy, and as long as it works that's great, and if a problem arises, I deal with it as they appear.
I have a form - http://jsfiddle.net/Yrdit/yQzsh/ - on an internal project. I have 1 database that contains numerous tables, but only 2 Should matter for what I need.
In my Form I have already figured out how to populate from 1 table the username and password.
In the two tables, there is 1 column that I want to be linked. - In Table 1 it is called company_name in table 2 it is called - user_company.
Table 1 handles the companies phone number, address etc.
Table 2 handles the username / password / name.
In my Fiddle I want Phone/ Address/ City/ Zip/ Country field's to be filled in depending on what is in the Company one.
Say if in my table my company is called CompanyABC, and has its details completed in the database Table 1. I want those values put into the fields I listed above.
$Table_1 = $db->get_row("SELECT user_login,user_password,user_name,user_email FROM Table_1 WHERE (user_id = $url_user_id) limit 1;");
Above is the part of code used as a request to get the login/ name/ password. Can anyone in a similar format guide me through how I can do what I've spoken about above please?
Apologies in advance if the formatting is wrong, I read the rules but might've missed something about formatting.
Not sure if I understand your question correctly but I'm assuming you wish to pull company info from table 1 and user info from table 2. If so you can use join - assuming you have some sort of identifier field in between the two... I.e. company_id. company names could work but this would not be good approach. 1. company names can be misspelled / uper-lower case issues / indexing performance. For the example sake lets join two tables on company name.
"SELECT t1.user_login,t1.user_password,t1.user_name,t1.user_email FROM Table_1 t1 LEFT JOIN Table_2 t2 ON t2.user_company = t1.company_name WHERE t1.user_id = $url_user_id LIMIT 1"
Hopefully that is the answer you were looking for.
I have a table in MySQL that I'm accessing from PHP. For example, let's have a table named THINGS:
things.ID - int primary key
things.name - varchar
things.owner_ID - int for joining with another table
My select statement to get what I need might look like:
SELECT * FROM things WHERE owner_ID = 99;
Pretty straightforward. Now, I'd like users to be able to specify a completely arbitrary order for the items returned from this query. The list will be displayed, they can then click an "up" or "down" button next to a row and have it moved up or down the list, or possibly a drag-and-drop operation to move it to anywhere else. I'd like this order to be saved in the database (same or other table). The custom order would be unique for the set of rows for each owner_ID.
I've searched for ways to provide this ordering without luck. I've thought of a few ways to implement this, but help me fill in the final option:
Add an INT column and set it's value to whatever I need to get rows
returned in my order. This presents the problem of scanning
row-by-row to find the insertion point, and possibly needing to
update the preceding/following rows sort column.
Having a "next" and "previous" column, implementing a linked list.
Once I find my place, I'll just have to update max 2 rows to insert
the row. But this requires scanning for the location from row #1.
Some SQL/relational DB trick I'm unaware of...
I'm looking for an answer to #3 because it may be out there, who knows. Plus, I'd like to offload as much as I can on the database.
From what I've read you need a new table containing the ordering of each user, say it's called *user_orderings*.
This table should contain the user ID, the position of the thing and the ID of the thing. The (user_id, thing_id) should be the PK. This way you need to update this table every time but you can get the things for a user in the order he/she wants using ORDER BY on the user_orderings table and joining it with the things table. It should work.
The simplest expression of an ordered list is: 3,1,2,4. We can store this as a string in the parent table; so if our table is photos with the foreign key profile_id, we'd place our photo order in profiles.photo_order. We can then consider this field in our order by clause by utilizing the find_in_set() function. This requires either two queries or a join. I use two queries but the join is more interesting, so here it is:
select photos.photo_id, photos.caption
from photos
join profiles on profiles.profile_id = photos.profile_id
where photos.profile_id = 1
order by find_in_set(photos.photo_id, profiles.photo_order);
Note that you would probably not want to use find_in_set() in a where clause due to performance implications, but in an order by clause, there are few enough results to make this fast.