I'm trying to write a SQL statement that outputs a table with the two columns show name and number of seasons. The show column must contain no duplocates and the number of seasons column counts the number of seasons associated with the show entity.
Here are my two tables
Shows Table
id | name
Seasons Table
id | show_id | season_number
Here's what I've tried so far
SELECT DISTINCT shows.name
FROM shows
INNER JOIN seasons on show.id = seasons.show_id;
The above code works for grabbing distinct names but whenever I try adding COUNT(season.id) it breaks.
Any suggestions?
Thanks!
Use group by to aggregate multiple rows with the same name into a group. With count(distinct id) you calculate the number of distinct values of the id column in that group.
SELECT name
, COUNT(DISTINCT seasons.id)
FROM shows
JOIN seasons
ON shows.show_id = seasons.show_id
GROUP BY
name
By the way, I'd expect a season to have a one to many relation to show, not the other way around.
Related
My problem is very specific and I couldn't figure out a better name for the title.
I have 3 tables, which are Pessoa (Person), Bicicleta (Bicicle) and Viagem (Trip):
What I want to do is select the names of the individuals by alphabetic order who had a trip, together with the Avaliacao (Evaluation) multiplied by Valor_Viagem (Trip cost).
What I tried to do (not working properly nor finished):
select distinct PESSOA.Nome, VIAGEM.Avaliacao, VIAGEM.Id_Bicicleta, BICICLETA.Valor_Viagem from PESSOA, VIAGEM
join BICICLETA ON VIAGEM.Id_Bicicleta = BICICLETA.Id where PESSOA.Email IN (
SELECT Email_Utilizador FROM VIAGEM
);
Which gives me:
^This is NOT what I want, as stated before.
I am also not 100% sure what you are looking for, but I assume you need a list of distinct names that contains the Avalacao * Valor_Viagem summed for each person (so a person with 5 trips has five times Avalacao * Valor_Viagem + ... + ...).
That is very easy to achieve:
select PESSOA.Nome, VIAGEM.Avaliacao, VIAGEM.Id_Bicicleta, BICICLETA.Valor_Viagem from PESSOA, VIAGEM, SUM(VIAGEM.Avaliacao * BICICLETA.Valor_viagem) AS trip_cost
join BICICLETA ON VIAGEM.Id_Bicicleta = BICICLETA.Id where PESSOA.Email IN (
SELECT Email_Utilizador FROM VIAGEM
) GROUP BY PESSOA.Nome;
What happens is the following:
first you compute the product for each trip
than you use the GROUP BY clause to group persons with identical names together
using SUM in combination with GROUP BY causes to sum all values of persons within this group, in that case all records with the same PESSOA.Nome
A word of warning
This assumes you will have distinct names. This appears risky. Better assign each person a unique Id and use this Id as foreign key instead of the name.
I have an SQL table data as follow
I want to display single record for product
example
90792 Amlaan-Hi-Power .............. Show only 1 record when there are 2 record
90793 Amlaan-Neutral .............. show only 1 record when there are 2 record
90794 Amlaan-Phosphate free .........show only 1 record when there are 2 record
90801 Acetone .......................show only 1 record when there are 2 record
90901 Acetanilide ...................show only 1 record when there is 1 record
Can I do this using Inner join
I know
select distinct product from product ORDER BY `product`.`product` DESC
will select distinct (unique) product code and that to only one field i.e. product but confused how to get other information using SQL statement
but results in duplicate records or same table...........................
It looks like your duplicate rows vary by the quantity of product in the package.
You can display just the product and name with
SELECT DISTINCT product, name
FROM product
If you want to deal with the quantity as well, that's a little trickier. This might work: it will put all product codes on one line.
SELECT product,
GROUP_CONCAT(product_code ORDER BY product_code) product_codes,
name
FROM product
GROUP BY product, name
Self join doesn't make a whole lot of sense for this application.
Use group by option for such purposes.
SELECT product,GROUP_CONCAT(product_code SEPERATOR '|') AS product_code,name FROM Table GROUP BY NAME
It will show only one record for duplicate names.
The multiple enteries of product code will seperated by | .
I have two tables users and sellers where user_id and seller_id is different. I want to compare the search query on the first name and the last name of sellers and users and get the results. The two tables have no foreign key associates with it, and on the sellers table its just the seller name. No first name or last name.
SELECT *
FROM users
WHERE first_name LIKE "%'.$search_string.'%"
OR last_name LIKE "%'.$search_string.'%"
that works for the users table.. how to join it with the sellers table?
From the users table I would like to get user_id,first_name,last_name. From the sellers table I would like to get seller_id, seller_name.
I don't quite get what you're trying to accomplish, because you don't mention if there's a joinable field like, for example, transaction id, to relate users and sellers.
If you're searching just any users row or sellers row where the subject matches a search string, you might try with
SELECT 'users' as origin, CONCATENATE('first_name',' ','last_name') as name
FROM users
WHERE (first_name like '%".$search_string."%' OR last_name like '%".$search_string."%')
UNION
SELECT 'sellers' as origin, seller_name as name
FROM sellers
WHERE ( seller_name like '%".$search_string."%')
keep in mind that, if you remove the 'origin' column, the UNION statement will perform an implicit DISTINCT on the resultset. If you need to display dupe results then you should use UNION ALL.
I have a table with a bunch of orders... one of the columns is order_status. The data in that column ranges from 1 to 5. Each number relates to a name, which is stored in another table that relates that number to the respective name.
SELECT order_id , order_status FROM tablename1
The above would just return the numbers 1,2,3,4,5 for order status. How can i query within the query on the fly to replace these numbers with their respective names.
Also, what's the term used to describe this. I'd Google it if i knew what the appropriate term was.
Each number relates to a name, which is stored in another table that
relates that number to the respective name.
JOIN it with the other table:
SELECT
t.order_id,
s.StatusName
FROM tablename1 AS t
INNER JOIN the statusesTable AS s ON t.order_status = s.status_id;
Lets say I have a table with 2 columns, 1 contains Cars and 1 contains random numbers.
How can I search for the lastest "ferrari" entry in the table and know whats the random number for that ferrari?
I assume your Cars table has columns id, name,rnid
You can use following sql;
SELECT MAX(c.id) AS latestferrari FROM Cars c INNER JOIN randomnumbers rn ON c.rnid=rn.id WHERE c.name="ferrari"