im not sure how i should write for the title. But i've found a case as below:
table name: student
| ID | FAVORITE | NAME | BIRTHDATE |
|----|----------|--------|-----------|
| | MATH | JOHN | 12/06 |
| | CHEM | RYAN | 11/07 |
| | MATH | OODA | 4/09 |
| | HISTORY | YINYIN | 25/05 |
how to make a new table that grouping the name based on their favorite lesson with mysql?
table name: favorite
| FAVORITE | NAME |
|----------|------------|
| MATH | JOHN, OODA |
| CHEM | RYAN |
| HISTORY | YINYIN |
We can use an aggregation query with the help of GROUP_CONCAT():
SELECT FAVORITE, GROUP_CONCAT(NAME) AS NAME
FROM yourTable
GROUP BY FAVORITE;
Related
I am facing a huge problem with MYSQL.
I have a table called tperson with the following content
+--------------+------------+
| tperson_id | first_name |
+--------------+------------+
| 1 | juan |
| 2 | miguel |
| 3 | Carlos |
| 4 | Diego |
+--------------+------------+
on the second table i have this data
+--------------+------------+------------+
| tperson_id | trans_code | date_added |
+--------------+------------+------------+
| 1 | 2000-01 |2020/03/03 |
| 1 | 2000-02 |2020/03/04 |
| 2 | 1999-05 |2019/12/25 |
| 3 | 1999-06 |2019/12/26 |
| 3 | 1999-07 |2019/12/27 |
+--------------+------------+------------+
Now I want to have this result in mysql
+--------------+------------+------------+------------+
| tperson_id | first_name | trans_code | date_added |
+--------------+------------+------------+------------+
| 1 | juan |2000-02 | 2020/03/04 |
| 2 | miguel |1999-05 | 2019/12/25 |
| 3 | Carlos |1999-07 | 2019/12/27 |
| 4 | Diego | null | null |
+--------------+------------+------------+------------+
what is the right MYsql statement to generation the result I want?
pls anyone help, I keep looking for the answer found nowhere. I am not good in any database.
thank you so much
I'm assuming your 2nd table name is tdate, and data on trans_code and date_added that's being selected is the latest value if there are more than one data from the same tperson_id on table tdate
SELECT tp.tperson_id, tp.first_name, MAX(td.trans_code), MAX(td.date_added)
FROM tperson tp
LEFT JOIN tdate td
ON tp.tperson_id = td.tperson_id
GROUP BY tp.tperson_id
Good afternoon everyone,
I wonder if I can get help with this example in a database.
I have listings delivered as:
------------------------------------
| Id | name | price |
-------------------------------
| 1 | Hawaii | 20.58 |
| 2 | Hawaii VIP | 45.58 |
| 3 | Aruba | 13.58 |
| 4 | Aruba VIP | 34.58 |
| 5 | Japon | 14.58 |
| 6 | Japon VIP | 34.58 |
| 7 | Alemania | 14.58 |
| 8 | Alemania VIP | 14.58 |
But I need them to be shown as follows:
-----------------------------------------------------
| Id | name | price basic | price vip
-----------------------------------------------------
| 1 | Hawaii | 20.58 | 45.34 |
| 5 | Japon | 14.58 | 34.58 |
etc etc etc
What I need are the two prices of the same country in a different column in the same query.
As I can catch the "VIP" based on this field and put it in a column with its value
It would be better to store IS_VIP as a separate column in the first table instead of adding it to the name, but since it's not a perfect world, you could solve it like this until then. :)
SELECT
t.Id,
t.name,
t.price as "price basic",
v.price as "price VIP"
FROM YourTable t
JOIN YourTable v ON v.name = CONCAT(t.name, ' VIP')
Sql Fiddle Example
I am looking to overwrite a column name in a table with an existing column name.
I am Looking for a way to get the remaining unspecified columns in the tables.
Note:
The query could have more joins in the future.
eg
Person
+-----------+----------+---------+
| firstname | lastname | pers_id |
+-----------+----------+---------+
| Joe | Soap | 1 |
| Bobby | Pin | 2 |
| Janet | Jackson | 3 |
+-----------+----------+---------+
Category
+----------+-------------------+--------+
| type | description | cat_id |
+----------+-------------------+--------+
| customer | people who pay us | 1 |
| employee | people we pay | 2 |
| director | people who direct | 3 |
+----------+-------------------+--------+
Person_Cat
(=^ェ^=)
+---------+--------+
| pers_id | cat_id |
+---------+--------+
| 3 | 1 |
| 2 | 2 |
| 1 | 3 |
+---------+--------+
Query
SELECT *, CONCAT(p.firstname, ' '
, p.lastname) as full_name
, c.cat_id AS category_id
, p.pers_id AS cat_id
FROM Person AS p
JOIN Person_Cat AS pc ON(p.pers_id = pc.pers_id)
JOIN Category AS c ON (pc.cat_id = c.cat_id)
OUTPUT
(Apologies for the length but the table after is more important)
+-----------+----------+---------+---------+--------+----------+-------------------+--------+---------------+-------------+--------+
| p | p | p | pc | pc | c | c | c | Select | Select | Select |
+-----------+----------+---------+---------+--------+----------+-------------------+--------+---------------+-------------+--------+
| firstname | lastname | pers_id | pers_id | cat_id | type | description | cat_id | full_name | category_id | cat_id |
+-----------+----------+---------+---------+--------+----------+-------------------+--------+---------------+-------------+--------+
| Janet | Jackson | 3 | 3 | 1 | customer | people who pay us | 1 | Janet jackson | 1 | 3 |
| Bobby | Pin | 2 | 2 | 2 | employee | people who we pay | 2 | Bobby Pin | 2 | 2 |
| Joe | Soap | 1 | 1 | 3 | director | people who direct | 3 | Joe Soap | 3 | 1 |
+-----------+----------+---------+---------+--------+----------+-------------------+--------+---------------+-------------+--------+
The headers above column names are there for reference
to where they comes from.
Column summary -
firstname, lastname, pers_id, pers_id, cat_id, type,
description, cat_id, full_name ,category_id, cat_id
Wanted output
+-----------+----------+---------+--------+----------+-------------------+---------------+-------------+--------+
| p | p | pc | pc | c | c | Select | Select | Select |
+-----------+----------+---------+--------+----------+-------------------+---------------+-------------+--------+
| firstname | lastname | pers_id | cat_id | type | description | full_name | category_id | cat_id |
+-----------+----------+---------+--------+----------+-------------------+---------------+-------------+--------+
| Janet | Jackson | 3 | 1 | customer | people who pay us | Janet jackson | 1 | 3 |
| Bobby | Pin | 2 | 2 | employee | people who we pay | Bobby Pin | 2 | 2 |
| Joe | Soap | 1 | 3 | director | people who direct | Joe Soap | 3 | 1 |
+-----------+----------+---------+--------+----------+-------------------+---------------+-------------+--------+
Column summary -
firstname, lastname, pers_id, cat_id, type,
description, full_name ,category_id, cat_id
Notice:
The p.pers_id and the c.cat_id are not present. I would like to think this would be because the were called directly and unmodified unlike the first and lastname used in ConCat
When the short answer is that there is no such concept as Select [remaining columns]at this time (2015-06-17), if you want to use SELECT * but only remove redundant columns,
then you will need to explicitly remove (ignore) those redundant columns when rendering your view.
You will have to explicitly configure logic of which columns to ignore, which is pretty much the same thing as explicitly listing the columns that you are interested in, so you get back to the argument against selecting all columns that I made in the comments above.
Unless your table schema is changing all the time, there really isn't reason for this.
I have a query that gives me this data:
| id | job | firstName | lastName |
+----+------------+-----------+----------+
| 1 | Programmer | NULL | NULL |
| 2 | NULL | Tom | Tucker |
But I need the table to look like this:
| id | job | firstName | lastName |
+----+------------+-----------+----------+
| 1 | Programmer | Tom | Tucker |
I need for it to display like this, not change the data in the database.
Use aggregate functions. Try this,
select min(Id) as Id,max(job) as Job,max(FNAME) as FNAME,max(LName) as LNAME
from yourtable
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