I am trying to write a SQL statement that selects data out of a table where an individual has multiple values in the same column. For example, based on the table below: I need a query to select all of the rows for all of the individuals who have both a bat and a baseball in the “Toy” column.
------------------------
| ID | Name | Toy |
------------------------
| 1 | Jack | Bat |
| 2 | Jim | Baseball |
| 3 | Jack | Baseball |
| 4 | John | Bat |
| 5 | Jim | Football |
| 6 | Jack | Glove |
------------------------
I would like the results to be something like:
-------------------
| Name | Toy |
-------------------
| Jack | Bat |
| Jack | Baseball |
-------------------
I hope this makes sense. Thanks.
select distinct t.name, t.toy
from your_table t
where name in
(
select name
from your_table
where toy in ('bat','baseball')
group by name
having count(distinct toy) = 2
)
and toy in ('bat','baseball')
If you just need the name you can do
select name
from your_table
where toy in ('bat','baseball')
group by name
having count(distinct toy) = 2
SQLFiddle demo
Related
I have 2 tables
Table1: customers:
-------------
| id | name |
-------------
| 1 | Mark |
-------------
| 2 | Tom |
-------------
| 3 | John |
Table2: sales:
-----------------------------------
|sid | customerid | price | state |
-----------------------------------
| 10 | 1 | 12000 | 0 |
-----------------------------------
| 11 | 2 | 13500 | 1 |
-----------------------------------
| 12 | 2 | 23000 | 1 |
-----------------------------------
| 13 | 3 | 26000 | 0 |
-----------------------------------
| 14 | 1 | 66000 | 1 |
-----------------------------------
the state column is 0=no dep and 1=dept
I want to list the customers that have DEPT by checking them in the sales table. Now i'm looping the customers and checking them one by one. and it works! but when the number of rows in the customer table grows the page slows down. i want to make this by an SQL query. can anyone help me please ?
the result will be like this:
Mark 66000
Tom 36500
By the Following query, you will get the same output as you want. The joining of tables will be executed on the filtered data using where condition
$this->db->select('customers.name,sum(sales.price)')
->from('customers')
->join('sales','sales.customerid = customers.id','left')
->where('sales.state !=0')
->group_by('customers.name');
->get()->result_array();
You can simply group by customer id in sales table. Code will be like this
return $this->db->select('MAX(customers.name) AS name, SUM(sales.price) as price')->join('sales', 'sales.customerid = customers.id')->where('sales.state', 1)->group_by('customers.id')->get('customers')->result();
Basically, I have a table which looks like this:
Table: People
------------------------
ID | Employee
------------------------
1 | Saul
2 | Jess
3 | Kenny
And then I have another table that looks like this:
Table: Projects
------------------------
ID | Project | Employee
------------------------
1 | pro1 | 3
2 | pro2 | 1
3 | pro3 | 2
The problem is that I want to replace the numbers in the Employee column of the Projects table with the corresponding names of the employees in the People table.
Thanks in advance.
You don't need to replace the ID Number, you need to build a query to show the results you want.
An example query can be:
SELECT Projects.ID, Projects.Project, People.Employee
FROM Projects
INNER JOIN People on Projects.Employee = People.ID
This will result in:
+----+---------+----------+
| ID | Project | Employee |
+----+---------+----------+
| 1 | pro1 | Kenny |
| 2 | pro2 | Saul |
| 3 | pro3 | Jess |
+----+---------+----------+
I have a table like this.
+------------+-------------+--------------+
| name | hobby | hobby_number |
+------------+-------------+--------------+
| jack | sport | 1 |
| marco | skydiving | 3 |
| alfonso | driving | 1 |
| marco | learning | 2 |
| jack | dancing | 2 |
+------------+-------------+--------------+
I want to use sql select statement to select only one unique name.
The table I want may look like this:
+------------+-------------+--------------+
| name | hobby | hobby_number |
+------------+-------------+--------------+
| jack | sport | 1 |
| marco | learning | 2 |
| alfonso | driving | 1 |
+------------+-------------+--------------+
What should sql query be?
Thank you in advance.
select t.* from your_table t
inner join
(
select name, min(hobby_number) as minh
from your_table
group by name
) x on x.name = t.name and x.minh = t.hobby_number
I'm new to relational sql. I'm trying to figure out a query to return the names of customers who have more than one type of account.
customers:
+------------+--------------+
| cid | Name |
+------------+--------------+
| 1 | Bob |
| 2 | John |
| 3 | Jane |
+------------+--------------+
accounts:
+------------+--------------+
| aid | type |
+------------+--------------+
| 1 | Checking |
| 2 | Saving |
| 3 | CD |
+------------+--------------+
transactions:
+------------+--------------+--------------+
| tid | cid | aid |
+------------+--------------+--------------+
| 1 | 1 | 1 |
| 2 | 2 | 1 |
| 3 | 1 | 2 |
| 4 | 2 | 3 |
| 5 | 3 | 1 |
+------------+--------------+--------------+
With these tables, the query should return Bob and John. I'm having some trouble with how to write such a query. More specifically, how do I keep count of how many accounts a customer has and how do I compare if the accounts are different without adding a new column to the table?
Okay, this seems to work in SQL Fiddle with my test data structure. Try it out with your real data structure and see if it gives you what you're looking for.
SELECT name FROM customers c WHERE EXISTS(
SELECT DISTINCT aid FROM transactions
WHERE cid = c.cid
HAVING COUNT(DISTINCT aid)>1
)
I have a table called tags, like this:
+-------+----------+
| tagID | tagName |
+-------+----------+
| 1 | jewelery |
| 2 | gifts |
| 3 | asdf |
| 4 | fashion |
| 5 | diamonds |
+-------+----------+
Then a table called coupon_tags, like this:
+-------+----------+
| tagID | couponID |
+-------+----------+
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 2 |
| 5 | 3 |
+-------+----------+
And lastly, a table called coupons, here are the pertinent parts (id is the same as couponID elsewhere):
+----+-----------------+
| id | zone |
+----+-----------------+
| 1 | Los Angeles |
| 2 | Orange County |
| 3 | Los Angeles |
| 5 | Orange County |
| 6 | Orange County |
+----+-----------------+
What I need to write a query for: I want to get tagNames via the first table that correspond to the ordered list of the top 10 most used tagIDs in the second table, but it only looks through couponIDs that match another criteria - that the "zone" be a certain zone. In the end, only the top 10 tagNames from a certain zone will show. I've never done a triple-table query before, any help?
I'm trying to keep this purely SQL, as I had a partially working PHP solution but it was messy and very slow.
SELECT tags.tagName FROM
(SELECT tagID, COUNT(*) FROM
coupon_tags
JOIN coupons ON coupons.couponID = coupon_tags.couponID AND zone = 'Los Angeles'
GROUP BY tagID ORDER BY COUNT(*) DESC LIMIT 10) AS most_used
JOIN tags ON most_used.tagID = tags.tagID