I have the following situation, namely I need to make a database,
in which I will store products that the user added to breakfast,
lunch, midday meal and dinner ON A SPECIFIC DAY.
I have a problem with the construction of such a relational database.
I currently have this combination of two tables:
It seems to me that I need 3 tables here in which
the products themselves will be placed, but I have no idea how
I can combine these 3 tables to get queries
products depending on the type of meal (breakfast, lunch ..) and date (the day they were added)
Yes, you should have a Products table that should have the 5 last columns you are showing in your second table (Orders?). And remove them from the Orders table such that it only has the IDs referencing the Meal and Product and the Date.
Then you can do the following:
SELECT o.Date, m.Meal_Name, p.Product_Name, p.Carbohydrates,
p.Protein, p.Fat, p.Calories
FROM Orders o
INNER JOIN Meals m ON o.MealID = m.MealID
INNER JOIN Products p ON o.ProductID = p.ProductID
ORDER BY o.date, m.Meal_Name, p.Product_Name
Note that this will allow you to easly change the parameters (such as fat or Carbohydrates for a Product and have it appear in all records for that product.
While there is certainly plenty of room to interpretation here and you may only want to go so far in normalizing your data, I think a better option would be:
meals:
id | user_id | category_id | date
1 | 1 | 1 | 2019-09-03
meal_category
id | name
1 | breakfast
2 | lunch
3 | dinner
products
id | name | carbs | protein | fat | calories
1 | apple| 10 | 5 | 0 | 30
2 | cat | 0 | 20 | 5 | 80
3 | ham | 10 | 30 | 10 | 160
meal_products
meal_id | product_id
1 | 1
1 | 2
Bringing this together:
SELECT meals.id, meals.user_id, meal.date, meal_category.name, product.name, product.carbs, products.protein, products.fat, products.calories
FROM meals
INNER JOIN meal_category ON meals.category_id = meal_category.id
INNER JOIN meal_produts ON meals.id = meal_products.meal_id
INNER JOIN products ON meal_products.product_id = products.id
Which would yeild
+-----------+----------------+------------+---------------------+---------------+----------------+-------------------+---------------+-------------------+
| meals.id, | meals.user_id, | meal.date, | meal_category.name, | product.name, | product.carbs, | products.protein, | products.fat, | products.calories |
+-----------+----------------+------------+---------------------+---------------+----------------+-------------------+---------------+-------------------+
| 1 | 1 | 9/3/2019 | breakfast | apple | 10 | 5 | 0 | 30 |
| 1 | 1 | 9/3/2019 | breakfast | cat | 0 | 20 | 5 | 80 |
+-----------+----------------+------------+---------------------+---------------+----------------+-------------------+---------------+-------------------+
Related
could help me solve this duplication problem where it returns more than 1 result for the same record I want to bring only 1 result for each id, and only the last history of each record.
My Query:
SELECT DISTINCT ON(tickets.ticket_id,ticket_histories.created_at)
ticket.id AS ticket_id,
tickets.priority,
tickets.title,
tickets.company,
tickets.ticket_statuse,
tickets.created_at AS created_ticket,
group_user.id AS group_id,
group_user.name AS user_group,
ch_history.description AS ch_description,
ch_history.created_at AS ch_history
FROM
tickets
INNER JOIN company ON (company.id = tickets.company_id)
INNER JOIN (SELECT id,
tickets_id,
description,
user_id,
MAX(tickets.created_at) AS created_ticket
FROM
ch_history
GROUP BY id,
created_at,
ticket_id,
user_id,
description
ORDER BY created_at DESC LIMIT 1) AS ch_history ON (ch_history.ticket_id = ticket.id)
INNER JOIN users ON (users.id = ch_history.user_id)
INNER JOIN group_users ON (group_users.id = users.group_user_id)
WHERE company = 15
GROUP BY
tickets.id,
ch_history.created_at DESC;
Result of my query, but returns 3 or 5 identical ids with different histories
I want to return only 1 id of each ticket, and only the last recorded history of each tick
ticket_id | priority | title | company_id | ticket_statuse | created_ticket | company | user_group | group_id | ch_description | ch_history
-----------+------------+--------------------------------------+------------+-----------------+----------------------------+------------------------------------------------------+-----------------+----------+------------------------+----------------------------
49713 | 2 | REMOVE DATA | 1 | t | 2019-12-09 17:50:35.724485 | SAME COMPANY | people | 5 | TEST 1 | 2019-12-10 09:31:45.780667
49706 | 2 | INCLUDE DATA | 1 | f | 2019-12-09 09:16:35.320708 | SAME COMPANY | people | 5 | TEST 2 | 2019-12-10 09:38:52.769515
49706 | 2 | ANY TITLE | 1 | f | 2019-12-09 09:16:35.320708 | SAME COMPANY | people | 5 | TEST 3 | 2019-12-10 09:39:22.779473
49706 | 2 | NOTING ELSE MAT | 1 | f | 2019-12-09 09:16:35.320708 | SAME COMPANY | people | 5 | TESTE 4 | 2019-12-10 09:42:59.50332
49706 | 2 | WHITESTRIPES | 1 | f | 2019-12-09 09:16:35.320708 | SAME COMPANY | people | 5 | TEST 5 | 2019-12-10 09:44:30.675434
wanted to return as below
ticket_id | priority | title | company_id | ticket_statuse | created_ticket | company | user_group | group_id | ch_description | ch_history
-----------+------------+--------------------------------------+------------+-----------------+----------------------------+------------------------------------------------------+-----------------+----------+------------------------+----------------------------
49713 | 2 | REMOVE DATA | 1 | t | 2019-12-09 17:50:10.724485 | SAME COMPANY | people | 5 | TEST 1 | 2020-01-01 18:31:45.780667
49707 | 2 | INCLUDE DATA | 1 | f | 2019-12-11 19:22:21.320701 | SAME COMPANY | people | 5 | TEST 2 | 2020-02-05 16:38:52.769515
49708 | 2 | ANY TITLE | 1 | f | 2019-12-15 07:15:57.320950 | SAME COMPANY | people | 5 | TEST 3 | 2020-02-06 07:39:22.779473
49709 | 2 | NOTING ELSE MAT | 1 | f | 2019-12-16 08:30:28.320881 | SAME COMPANY | people | 5 | TESTE 4 | 2020-01-07 11:42:59.50332
49701 | 2 | WHITESTRIPES | 1 | f | 2019-12-21 11:04:00.320450 | SAME COMPANY | people | 5 | TEST 5 | 2020-01-04 10:44:30.675434
I wanted to return as shown below, see that the field ch_description, and ch_history bring only the most recent records and only the last of each ticket listed, without duplication I wanted to bring this way could help me.
Two things jump out at me:
You have listed "created at" as part of your "distinct on," which is going to inherently give you multiple rows per ticket id (unless there happens to be only one)
The distinct on should make the subquery on the ticket history unnecessary... and even if you chose to do it this way, you again are going on the "created at" column, which will give you multiple results. The ideal subquery, should you choose this approach, would have been to group by ticket_id and only ticket_id.
Slightly related:
An alternative approach to the subquery would be an analytic function (windowing function), but I'll save that for another day.
I think the query you want, which will give you one row per ticket_id, based on the history table's created_at field would be something like this:
select distinct on (t.id)
<your fields here>
from
tickets t
join company c on t.company_id = c.id
join ch_history ch on ch.ticket_id = t.id
join users u on ch.user_id = u.ud
join group_users g on u.group_user_id = g.id
where
company = 15
order by
t.id, ch.created_at -- this is what tells distinct on which record to choose
I have one table with fake individual tax records like so (one row per filer):
T1:
+-------+---------+---------+
| Person| Spouse | Income |
+-------+---------+---------+
| 1 | 2 | 34000 |
| 2 | 1 | 10000 |
| 3 | NULL | 97000 |
| 4 | 6 | 11000 |
| 5 | NULL | 25000 |
| 6 | 4 | 100000 |
+-------+---------+---------+
I have a second table which has tax 'families', a single individual or married couple (one line per tax 'family').
T1_Family:
+-------- -+-------+---------+
| Family_id| Person| Spouse |
+-------- -+-------+---------+
| 2 | 2 | 1 |
| 3 | 3 | NULL |
| 5 | 5 | NULL |
| 6 | 6 | 4 |
+------ ---+-------+---------+
Family = max(Person) within a couple
The idea of joining the two is for example, to sum the income of 2 people in one tax family (aggregate to the family level).
So, I've tried the following:
select *
into family_table
from
(
(select * from T1_family)a
join
(select * from T1)b
on a.family = b.person **or a.spouse = b.person**
)
where family_id is not null and person is not null
What I should get (and I do get when I select 1 random couple) is one line per individual where I can then group by family_id and sum income, pension contributions, etc. BUT SQL times out before the tables can be joined. The part in bold is what's slowing down the process but I'm not sure what else to do.
Is there an easier way to group by family?
It is simpler to put the data on one row:
select a.*, p.income as person_income, s.income as spouse_income
into family_table
from t1_family a left join
t1 p
on a.person = p.person lef tjoin
t1 s
on a.spouse = s.person;
Of course, you can add them together as well.
I have a team of people who are scored on up to three metrics; sales, leads and Hours.
I have a table (tblScores) in MS Access which holds these scores but only if there is any. (e.g if someone had no sales there would be no entry for them for sales)
| USERID | Metric | Score |
----------------------------------
| 20511 | Sales | 12 |
| 20511 | Leads | 9 |
| 20511 | Hours | 8 |
| 20694 | Sales | 10 |
| 20694 | Hours | 7.5 |
I am trying to create an SQL query that will output three records (each possible metric) for each User in the above table including null values where they don't have an entry for that metric. e.g
| USERID | Metric | Score |
----------------------------------
| 20511 | Sales | 12 |
| 20511 | Leads | 9 |
| 20511 | Hours | 8 |
| 20694 | Sales | 10 |
| 20694 | Leads | Null |
| 20694 | Hours | 7.5 |
I have set up another table (tblMetrics) with just these 3 metrics
| Metric |
---------------
| Sales |
| Leads |
| Hours |
and tried to do a left join on the metric table against the score table
SELECT tblMetrics.*, TblScores.UserID, TblScores.Score
FROM tblMetrics LEFT JOIN TblScores ON tblMetrics.Metric = TblScores.Metric;
but it is still not giving the desired output. Does anyone know if this possible?
You need to do a CROSS JOIN first to generate all combinations, then do the LEFT JOIN to find which one are missing and assign NULL
I check access syntaxis and the CROSS JOIN should be write like this
SELECT DISTINCT M.Metric, S.USERID
FROM tblMetric M, tblScore S
And the Left Join should be
SELECT userMetrc.*, S.Score
FROM ( SELECT DISTINCT M.Metric, S.USERID
FROM tblMetric M, tblScore S
) userMetric
LEFT JOIN tblScore S
ON ( userMetric.USERID = S.USERID
AND userMetric.Metric = S.Metric )
I have three tables, I need to make a CROSS JOIN between them to display the IDs and names of the products and the stores that sell them, here is an example of how now
TABLE_PRODUCT
ID_PRODUCT | NAME_PRODUCT
1 | Addidas Super Star
2 | Calvin Klein BAG
TABLE_STORE
ID_STORE | NAME_STORE
1 | ThE 98
2 | C&A
TABLE_PROD_STOR
ID_STORE | ID_PROD
1 | 1
2 | 2
And I need the result in the format:
ID STORE | STORE | ID PRODUCT | PRODUCT |
1 | ThE 98 | 1 | Addidas Super Star |
2 | C&A | 2 | CALVIN KLEIN HAT |
My biggest problem is that when I do the CROSS JOIN, the names are repeated twice each. What is the solution?
Select
y.ID_STORE ,
y.NAME_STORE store ,
x.ID_PRODUCT,
x.NAME_PRODUCT product
from
TABLE_PRODUCT x inner join
TABLE_STORE y
on x.ID_PRODUCT =y.ID_STORE
inner join TABLE_PROD_STOR z
on x.ID_PRODUCT =z.ID_STORE
I have two tables:
1. Master
| ID | Name | Amount |
|-----|--------|--------|
| 1 | a | 5000 |
| 2 | b | 10000 |
| 3 | c | 5000 |
| 4 | d | 8000 |
2. Detail
| ID |MasterID| PID | Qty |
|-----|--------|-------|------|
| 1 | 1 | 1 | 10 |
| 2 | 1 | 2 | 20 |
| 3 | 2 | 2 | 60 |
| 4 | 2 | 3 | 10 |
| 5 | 3 | 4 | 100 |
| 6 | 4 | 1 | 20 |
| 7 | 4 | 3 | 40 |
I want to select sum(Amount) from Master which joins to Deatil where Detail.PID in (1,2,3)
So I execute the following query:
SELECT SUM(Amount) FROM Master M INNER JOIN Detail D ON M.ID = D.MasterID WHERE D.PID IN (1,2,3)
Result should be 20000. But I am getting 40000
See this fiddle. Any suggestion?
You are getting exactly double the amount because the detail table has two occurences for each of the PIDs in the WHERE clause.
See demo
Use
SELECT SUM(Amount)
FROM Master M
WHERE M.ID IN (
SELECT DISTINCT MasterID
FROM DETAIL
WHERE PID IN (1,2,3) )
What is the requirement of joining the master table with details when you have all your columns are in Master table.
Also, isnt there any FK relationhsip defined on these tables. Looking at your data it seems to me that there should be FK on detail table for MasterId. If that is the case then you do not need join the table at all.
Also, in case you want to make sure that you have records in details table for the records for which you need sum and there is no FK relationship. Then you could give a try for exists instead of join.