Multiple Separate WHERE classes in single VIEW - sqlite

I need help creating a single SELECT statement as part of a CREAT VIEW statement that contains multiple, separate filtering or grouping requirements.
I am working on an SQLite database to track usage of our local food pantry, where we have two types of visitors, “Scheduled” or “Drop-In”, visiting on different days. One of the central tables is the “visit_log” table that tracks each visit by date, time, type of visit, and people in the household.
I’m trying to create a VIEW that summarizes that “visit_log” grouped by the visit_date, and for both number of records and SUM of household size, displaying the number of “Drop-Ins”, the number of “Scheduled” and the total of the two types.
Here is the “visit_log”
CREATE TABLE "visit_log" ("visit_date" DATE, "visit_time" TIME, "client_relation" TEXT, "household_size" INTEGER)
Here is a sample of the “visit_log” table’s content. (We have not started recording the visit_time yet, so those values are blank).
"visit_date","visit_time","client_relation","household_size"
"6/9/20","","Scheduled","1"
"6/9/20","","Scheduled","1"
"6/9/20","","Drop-In","2"
"6/9/20","","Drop-In","3"
"6/9/20","","Drop-In","8"
"6/9/20","","Drop-In","5"
"6/16/2020","","Scheduled","1"
"6/16/2020","","Scheduled","1"
"6/16/2020","","Drop-In","4"
"6/16/2020","","Drop-In","5"
"6/16/2020","","Drop-In","2"
"6/16/2020","","Drop-In","2"
"6/16/2020","","Drop-In","5"
"6/16/2020","","Drop-In","1"
I can create three separate VIEW, one for each type and one for the two combined. But my goal is to have the results of these three VIEWs in one.
Here are the three VIEWs. First is for the two client types combined.
CREATE VIEW "visit_summary" AS SELECT
visit_date,
COUNT (*) AS households_total,
SUM (household_size) AS individuals_total
FROM
"visit_log"
GROUP By visit_date
This yields
"visit_date","households_total","individuals_total"
"06/09/2020","12","44"
"06/16/2020","8","21"
"06/23/2020","7","20"
"06/30/2020","10","22"
"07/07/2020","7","18"
Next is the VIEW for the Drop-Ins
CREATE VIEW "visit_summary_dropin" AS SELECT
visit_date,
COUNT (*) AS households_dropin,
SUM (household_size) AS individuals_dropin
FROM
"visit_log"
WHERE client_relation = "Drop-In"
GROUP By visit_date
This yields
"visit_date","households_dropin","individuals_dropin"
"06/09/2020","10","42"
"06/16/2020","6","19"
"06/23/2020","4","13"
"06/30/2020","6","12"
"07/07/2020","6","16"
Finally is the VIEW for the Scheduled
CREATE VIEW "visit_summary_scheduled" AS SELECT
visit_date,
COUNT (*) AS households_schedualed,
SUM (household_size) AS individuals_scheduled
FROM
"visit_log"
WHERE client_relation = "Scheduled"
GROUP By visit_date
This yields
"visit_date","households_schedualed","individuals_scheduled"
"06/09/2020","2","2"
"06/16/2020","2","2"
"06/23/2020","3","7"
"06/30/2020","4","10"
"07/07/2020","1","2"
What I'm hoping to create is a single VIEW that yields
"visit_date","households_total","individuals_total","households_dropin","individuals_dropin","households_schedualed","individuals_scheduled"
"06/09/2020","12","44","10","42","2","2"
etc…
So my ultimate question, finally, is how to create a single VIEW containing something like multiple WHERE classes to define different columns?


You can do it with conditional aggregation:
CREATE VIEW visit_summary_scheduled_all AS
SELECT visit_date,
COUNT(*) households_total,
SUM(household_size) individuals_total,
SUM(client_relation = 'Drop-In') households_dropin,
SUM(CASE WHEN client_relation = 'Drop-In' THEN household_size END) individuals_dropin,
SUM(client_relation = 'Scheduled') households_scheduled,
SUM(CASE WHEN client_relation = 'Scheduled' THEN household_size END) individuals_scheduled
FROM visit_log
GROUP By visit_date
See the demo.
Results:
| visit_date | households_total | individuals_total | households_dropin | individuals_dropin | households_scheduled | individuals_scheduled |
| ---------- | ---------------- | ----------------- | ----------------- | ------------------ | -------------------- | --------------------- |
| 6/16/2020 | 8 | 21 | 6 | 19 | 2 | 2 |
| 6/9/20 | 6 | 20 | 4 | 18 | 2 | 2 |

Related

Interactive Grid:Process with PL/SQL only that isn't based off a table

Env: Oracle APEX v5.1 with Oracle 12c Release 2
Firstly, I have created an Interactive Grid that isn't based off an underlying table as I will process this manually using PL/SQL.
I have been using the following as a guide:
https://apex.oracle.com/pls/apex/germancommunities/apexcommunity/tipp/6361/index-en.html
I basically have the following query:
select
level as id,
level as grid_row,
null as product,
null as product_item
from dual connect by level <= 1
Concentrating on just the product and product_item columns where the product_item column will be a readonly column and only the product number can be entered, I would like to achieve the following:
Product Product Item
---------- -------------
123456 123456-1
123456 123456-2
556677 556677-1
654321 654321-1
654321 654321-2
654321 654321-3
123456 123456-3
From the above, as the user types in the Product and then tabs out of the field, I would like a DA to fire that will add the sequence of "-1" to the end of that product number. Then is the user then adds another row within the IG and enters the same product number, I then want it to append "-2" to the end of it.
Only when the product changes number, I need the sequence to reset to "-1" for that new product as per 556677 and so forth.
Other scenarios that should also be taken into consideration are as follows:
From above IG, the user entered 123456 again but this should calculate that the next sequence for 123456 is "-3"
The same needs to be catered for, when a Product is removed from the IG but to always look at the max sequence number for that product.
I was thinking of possibly using APEX_COLLECTIONS as a means of storing what is currently in the grid, since no changes have been committed to the database.

Assuming you have a collection of product values (in this case, I am using the built-in SYS.ODCINUMBERLIST which is a VARRAY data type) then the SQL for your output would be:
SELECT id,
id AS grid_row,
product,
product || '-' || ROW_NUMBER() OVER ( PARTITION BY product ORDER BY id )
AS product_item
FROM (
SELECT ROWNUM AS id,
COLUMN_VALUE AS product
FROM TABLE(
SYS.ODCINUMBERLIST(
123456,
123456,
556677,
654321,
654321,
654321,
123456
)
)
)
ORDER BY id
Output:
ID | GRID_ROW | PRODUCT | PRODUCT_ITEM
-: | -------: | ------: | :-----------
1 | 1 | 123456 | 123456-1
2 | 2 | 123456 | 123456-2
3 | 3 | 556677 | 556677-1
4 | 4 | 654321 | 654321-1
5 | 5 | 654321 | 654321-2
6 | 6 | 654321 | 654321-3
7 | 7 | 123456 | 123456-3
db<>fiddle here

As you mentioned, the data you enter is not saved into the DB whilst you are inserting your products, so it is not in fact stored anywhere.
So you cannot go check if that value already exists and enter a -2 or other.
Some things to consider would be to maybe save the values into a temp table so you can then have a function go check how many product_item like 123456-% are in there and use that number +1 as your new product_item.
Or you could go the even harder way and do it all with javascript. For this you will need to somehow get all records in the IG, go through them all and see how many occurences of 123456 you have and then insert 123456-(no of occurences + 1).

How to rank rows in a table in sqlite?

How can I create a column that has ranked the information of the table based on two or three keys?
For example, in this table the rank variable is based on Department and Name:
Dep | Name | Rank
----+------+------
1 | Jeff | 1
1 | Jeff | 2
1 | Paul | 1
2 | Nick | 1
2 | Nick | 2
I have found this solution but it's in SQL and I don't think it applies to my case as all information is in one table and the responses seem to SELECT and JOIN combine information from different tables.
Thank you in advance

You can count how many rows come before the current row in the current group:
UPDATE MyTable
SET Rank = (SELECT COUNT(*)
FROM MyTable AS T2
WHERE T2.Dep = MyTable.Dep
AND T2.Name = MyTable.Name
AND T2.rowid <= MyTable.rowid);
(The rowid column is used to differentiate between otherwise identical rows. Use the primary key, if you have one.)

SQLite select query to get one row from multiple rows have same id

I'm trying to get one row from table that have an id column that duplicate in several rows of a SQlite database, but I am getting all rows in table.
This is my table creation and selection query.
CREATE TABLE IMAGES ( MID INTEGER , IMAGE BLOB, ID INTEGER );
SELECT DISTINCT ID, IMAGE FROM IMAGES;
This what I get
mid | image | id
1 | m1 | 1
2 | m2 | 1
3 | m3 | 1
4 | m4 | 2
5 | m5 | 3
6 | m6 | 3
And this what i want
mid | image | id
1 | m1 | 1
4 | m4 | 2
5 | m5 | 3

DISTINCT applies to all the SELECTed columns, i.e., you get each unique combination of id and image in the data.
To control which columns get deduplicated, use GROUP BY.
You also have to specify which image you want for each ID; if you don't use MIN(), you get a random image:
SELECT id, MIN(image)
FROM images
GROUP BY id;

You need to choose the correct columns
SELECT min(mid) FROM images GROUP BY id;
Then you need to use that to select the correct rows.
SELECT DISTINCT ID, IMAGE FROM IMAGES WHERE mid in (SELECT min(mid) FROM images GROUP BY id);
Otherwise the records from the GROUP BY, could be made up from any (or last) of the rows.

Splitting one column from same table into multiple columns in MS-Access

For example I have a DB which has following entries:
Item_Name |TransactionType |Qty
A |Purchase |50
A |Sale | 1
A |Sale | 2
B |Purchase |25
B | Sale | 1
B |Sale | 1
Above table is named as Entries, Now I want to write a query in MS-Access which will give following output?
Item_Name |Purchased_QTY |Sale_QTY
A |50 | 3
B |25 | 2
I want to check for each item what is the sales and purchase
Can someone help here

You can use crosstab query. SQL text of it below. Also this can be done using IIF() functions, but crosstab is faster in design and execution.
TRANSFORM Sum([DataTable].Qty) AS SumOfQty
SELECT [DataTable].Item_Name
FROM DataTable
GROUP BY [DataTable].Item_Name
PIVOT [DataTable].TransactionType;

selecting a row based on a number of column values in SQLite

I have a table with this structure:
id | IDs | Name | Type
1 | 10 | A | 1
2 | 11 | B | 1
3 | 12 | C | 2
4 | 13 | D | 3
except id nothing else is a FOREIGN or PRIMARY KEY. I want to select a row based on it's column values that are not PRIMARY KEY. I have tried the following syntax but it yields no results.
SELECT * FROM MyTable WHERE Name = 'A', Type = 1;
what am I doing wrong? What is exactly returned by a SELECT statement? I'm totally new to Data Base and I'm currently experimenting and trying to learn it. so far my search has not yield any results regarding this case.

Use and to add multiple conditions to your query
SELECT *
FROM MyTable
WHERE Name = 'A'
AND Type = 1;

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