So im wondering if its possible for SQLite to understand number ranges.
I want to be able to have a range such as "25-30" and lookup "27" to see if it falls within that range.
The issue is that the range will contain some text beforehand such as "Alice 25-30"
An example of what Id be looking to achieve can be seen in Table3 of this link:
https://dbfiddle.uk/?rdbms=sqlite_3.27&fiddle=483f62c5fbf13998659cd5f7ebbb3ce9
More than happy for solutions that can break the string at the first number, but still keep the number so
Alice | 25-30
Not
Alice | 5-30 (ive seen this suggested before :D)
To actually create Table 3 ill be using either INNER or LEFT OUTER JOIN not just Re-creating the table but was speedier to do this
Thanks in advance.
You can do it with a join of the 2 tables like this:
INSERT INTO Table3 (`ID`, `Age`,'Age Range')
SELECT t1.ID, t1.Age, t2.`Age Range`
FROM Table1 t1 INNER JOIN Table2 t2
ON t1.Age + 0 BETWEEN `Age Range` + 0
AND SUBSTR(`Age Range`, INSTR(`Age Range`, '-') + 1) + 0
SQLite performs implicit conversions of strings to numbers when they are used in expressions with numeric operations like +0, so what the query does is to compare Age to the 1st and the 2nd part of Age Range numerically.
Note that + 0 would not be needed in ON t1.Age + 0 BETWEEN if you had defined Age as REAL which makes more sense.
Change the INNER join to LEFT join if you want the row from Table1 inserted to Table3 even if there is no matching Age Range.
See the demo.
Results:
ID
Age
Age Range
1
30
25-30
2
40.5
31-45
Related
Imagine I have two tables:
Table A
Names
Sales
Department
Dave
5
Shoes
mike
6
Apparel
Dan
7
Front End
Table B
Names
SALES
Department
Dave
5
Shoes
mike
12
Apparel
Dan
7
Front End
Gregg
23
Shoes
Kim
15
Front End
I want to create a query that joins the tables by names and separates sum of sales by table. I additionally want to filter my query to remove string matches or partial matches in this case by certain names.
What I want is the following result
Table C:
A Sales Sum
B Sales Sum
18
24
I know I can do this with a query like the following:
SELECT SUM(A.sales) AS 'A Sales Sum', SUM(B.sales) AS 'B sales Sum' FROM A
JOIN B
ON B.names = A.Names
WHERE Names NOT LIKE '%Gregg%' OR NOT LIKE '%Kim%'
The problem with this is the WHERE clause doesn't seem to apply, or applies to the wrong table. Since the Names column doesn't exactly match between the two, what I think is happening is when they are joined 'ON B.names = A.Names', the extras from B are being excluded? When I flip things around though I get the same result, which is no filter being applied. The wrong result I am getting is the following:
Table D:
A Sales Sum
B Sales Sum
18
62
Clearly I have a syntax issue here since I'm pretty new to SQL. What am I missing? Thanks!
You don't need a join or a union of the tables and you shouldn't do it.
Aggregate in each table separately and return the results with 2 subqueries:
SELECT
(SELECT SUM(Sales) FROM A WHERE Names NOT LIKE '%Gregg%' AND Names NOT LIKE '%Kim%') ASalesSum,
(SELECT SUM(Sales) FROM B WHERE Names NOT LIKE '%Gregg%' AND Names NOT LIKE '%Kim%') BSalesSum
I think you want a union approach here:
SELECT
SUM(CASE WHEN src = 'A' THEN sales ELSE 0 END) AS "A Sales Sum",
SUM(CASE WHEN src = 'B' THEN sales ELSE 0 END) AS "B Sales Sum"
FROM
(
SELECT sales, 'A' AS src FROM A WHERE Names NOT IN ('Gregg', 'Kim')
UNION ALL
SELECT sales, 'B' FROM B WHERE Names NOT IN ('Gregg', 'Kim')
) t;
Here is a demo showing that the above query is working.
I have a scenario where i have to correct the history data. The current data is like below:
Status_cd event_id phase_cd start_dt end_dt
110 23456 30 1/1/2017 ?
110 23456 31 1/2/2017 ?
Status_cd event_id phase_cd start_dt end_dt
110 23456 30 1/1/2017 ?
111 23456 30 1/2/2017 ?
The major columns are status_cd and phase_cd. So, if any one of them change the history should be handled with the start dt of the next record as the end date of the previous record.
Here both the records are open which is not correct.
Please suggest on how to handle both the scenarios.
Thanks.
How are your history rows ordered in the table? In other words, how do you decide which history rows to compare to see if a value was changed? And how do you uniquely identify a history row entry?
If you order your history rows by start_dt, for example, you can compare the previous and current row values using window functions, like Rob suggested:
UPDATE MyHistoryTable
FROM (
-- Get source history rows that need to be updated
SELECT
history_row_id, -- Change this field to match your table
MAX(status_cd) OVER(ORDER BY start_dt ROWS BETWEEN 1 FOLLOWING AND 1 FOLLOWING) AS status_cd_next, -- Get "status_cd" value for "next" history row
MAX(phase_cd) OVER(ORDER BY start_dt ROWS BETWEEN 1 FOLLOWING AND 1 FOLLOWING) AS phase_cd_next,
MAX(start_dt) OVER(ORDER BY start_dt ROWS BETWEEN 1 FOLLOWING AND 1 FOLLOWING) AS start_dt_next
FROM MyHistoryTable
WHERE status_cd <> status_cd_next -- Check "status_cd" values are different
OR phase_cd <> phase_cd_next -- Check "phase_cd" values are different
) src
SET MyHistoryTable.end_dt = src.start_dt_next -- Update "end_dt" value of current history row to be "start_dt" value of next history row
WHERE MyHistoryTable.history_row_id = src.history_row_id -- Match source rows to target rows
This assumes you have a column to uniquely identify each history row, called "history_row_id". Give it a try and let me know.
I don't have a TD system to test on, so you may need to futz with the table aliases too. You'll also probably need to handle the edge cases (i.e. first/last rows in the table).
I have an SQLite Database, two of the tables look like this:
ID Name
1 Test1
2 Test2
3 Test3
4 Test4
ID Color
1 Blue
1 White
1 Red
2 Green
2 Red
4 Black
In the first Tables, ID is unique, the second table lists colors an ID has, it can be from 0 to n colors.
Now I want to select all Names exactly once, that have one or more given color. Lets say, I want to have all names associated with blue, white and/or green. The resultset should have the IDs 1 and 2.
I am completly lost here, as I normally dont do any SQL. I am just familiar with very basic SQL. What I would do is Join the tables together, but I dont know how I do that, as ID is not unique in the second table. Also there would be the problem of IDs beeing duplicated in the resultset, if it has multiple colors that I want to select.
Thanks in advance for any help.
You don't need a join for this. Get the list of IDs from the color table in a subquery, and fetch the names from the test table with an in clause:
sqlite> select * from tests where id in
(select id from colors where name in ('Blue', 'White', 'Green'));
1|Test1
2|Test2
Duplicates don't matter in the subquery, but you could use distinct if you want that list without duplicates in other contexts.
I've seen the similar problem with mysql, but I barely could find any solution for the problem with sqllite.
My sample table,
-----------------------------
ID | Product Name | Price
-----------------------------
1 A 2
2 B 2
3 C 1
4 D 3
5 E 2
Here I need to get the rows until the total for the price column is equal or smaller than 5 in ascending order.
You could do a Running total using the Product ID and ORDER BY Product ID like the one below:
SELECT p1.ID, p1.ProductName, p1.Price,
(SELECT SUM(p2.Price) FROM Products p2 WHERE p1.ID >= p2.ID ORDER BY p2.ID ) as RunningTotal
FROM Products p1
WHERE RunningTotal <= 5
ORDER BY p1.ID
See Fiddle Demo
Or using the Price and ORDER BY Price like one below:
SELECT p1.ID, p1.ProductName, p1.Price,
(SELECT SUM(p2.Price) FROM Products p2 WHERE p1.Price >= p2.Price ORDER BY Price )
as RunningTotal
FROM Products p1
WHERE RunningTotal <= 5
ORDER BY p1.Price;
See 2nd Fiddle Demo
It's probably best to do it in code as SQLite does not support an easy way to do cumulative sums as far as I know. You can create an index on the Price column.
Then running a query like
SELECT * FROM <table> ORDER BY Price
Note that this will not eagerly fetch all rows from the database, but just provide you with the cursor. Keep fetching the next row from the cursor until you reach the desired sum.
I have a data structure where I have two tables Alpha and Beta and they are one to many. For the sake of an example let's say that table alpha has a column for "State" and table B has "Colors you like" and you can pick more than one. I would like to build a report that has columns like this:
STATE TOTAL RED GREEN BLUE
Alaska 5 1 3 1
Florida 2 2 2 0
New York 10 5 8 1
The column TOTAL would be a count of the records in Alpha and as you can see due to the one to many relationship the sum of the colors can exceed the count. I suppose it could be less as well if people didn't like colors.
How would you build a report like this. I'll be using SQL Server and Reporting Services in .NET so it could either be a complex query that I just dump into a data table report or a less complex query with some counting and totaling done by the report. I just don't really know the best way to tackle this.
Since you don't know which colors are going to be the columns you should use the Matrix Control
You'll need to set up the query
SELECT
a.State,
b.ColorName,
COUNT(b.ColorID) ColorCount
FROM
alpha a
LEFT JOIN beta b
ON a.id = b.a_id
GROUP BY
a.State,
b.ColorName
Just drag state for the rows, color for the columns and ColorCount for the data (Count(ColorID) will display in the data field))
Note: The LEFT JOIN and Count(ColorID) instead of Count(*) are required if you want a 0 value to appear correctly.
If you did know the colors you could use PIVOT or the sum case technique
SELECT state SUM(CASE WHEN Color = 'RED' THEN 1 ELSE 0 END) as Red, ...