I have Fact table named as Admissions. My purpose is to count the row of count(patient_id)>2 in the fact table. Can anyone show me how. I am new to this.
Related
Hey guys, maybe this is a basic SQL qn. Say I have this very simple table, I need to run a simple sql statement to return a result like this:
Basically, the its to dedup Name based on it's row's Value column, whichever is larger should stay.
Thanks!
Framing the problem correctly would help you figure it out.
"Deduplication" suggests altering the table - starting with a state with duplicates, ending with a state without them. Usually done in three steps (getting the rows without duplicates into temp table, removing original table, renaming temp table).
"Removing rows with duplicated column values" also suggests alteration of data and derails train of thought.
What you do want is to get the entire table, and in cases where the columns you care about have multiple values attached get the highest one. One could say... group by columns you care about? And attach them to the highest value, a maximum value?
select id,name,max(value) from table group by id,name
I'm building an attendance system that tracks attendance in an SQL table.
I do this by adding a new column of a date to the table every time it's used.
now I have a problem adding new rows for new users because I don't know how many columns I have so I cant use INSERT INTO Table VALUES().
Is there any alternative way to do it?
Edit:
here's how it's supposed to look
and every day it's supposed to add a column for the date.
I don't really understand how can I do it with adding dates as rows
can someone elaborate?
I think you should probably tweak the design of your tables. Using the example of a school:
Student Table:
ID (Primary Key)
Name
(More student specific columns here)
Attendance Table:
ID (Primary Key)
StudentID (Foreign Key)
Date
Attended
TimeArrived
(More Attendance specific columns here)
In the above example, each day would get a new row added to the attendance table and you could avoid dynamically adding columns.
Trying to create relationships (joins) between tables in power pivot.
Got 2 tables I wold like to join together, connected with a common column = CustomerID.
One is a Fact Table the other Dim table (look up).
I have run the "remove duplicates" on both tables without any problem.
But I still get an error saying : "the relationship cannot be created because each column contains duplicate values. Select at least one column that contains only unique values".
The Fact Table contains duplicates (as it should?) and the Dim Table do not, why do I get this error?
Help much appreciated
Created an appended table with both columns "CustomerID". After the columns where appended together I could "remove duplicates" and connect the tables together through the newly created appended table.
Don't know if this causes another problem later however.
You can also check for duplicate id values in a column by using the group by feature.
Remove all columns except ID, add a column that consists only of the number 1.
Group by ID, summing the content of the added column and filter out IDs whose total equals 1. What's left are duplicated IDs.
I have an array of 50+ elements that dictates how many hours were worked for a given week.
What is the proper way to store this information into a database table?
My initial idea was to use a delimiter, but the text is too large (280 characters) to fit.
Additionally, there seems something "wrong" with creating a table column for each element.
Ideas?
Array using delimiter (comma):
37.5,37.5,37.5,37.5,37.5,37.5,37.5,37.5,37.5,37.5, ...
The "proper" way is to store the array's contents as multiple rows in a whole other table, each with a foreign key referencing the record they belong to back in the first table. There may be other things that work for you, though.
[EDIT]: From the details you added I'm guessing your array elements consist of a number of hours worked each week and you have 50+ of them because a year has 52-ish weeks. So what I think you're looking for, is I guess that your current (main) table is called something like "employees," is that each row there should have some unique identifier for each employee record. So your new table might be called "work_weeks" and consist of something like employee_id (which matches the employee id in the current table), week_number, and hours_worked.
Seems like a 1 to many relationship. For this example, tableA is the 1 and tableBlammo is the many.
tableA => column blammoId
tableBlammo => column blammoId, column data
One row in tableA joins to multiple rows in tableBlammo via the blammoId column.
Each row in tableBlammo has one element of the array in the data column.
How do delete duplicate records in a DB2 table? I want to be left with a single record for each group of dupes.
Create another table "no_dups" that has exactly the same columns as the table you want to eliminate the duplicates from. (You may want to add an identity column, just to make it easier to identify individual rows).
Insert into "no_dups", select distinct column1, column2...columnN from the original table. The "select distinct" should only bring back one row for every duplicate in the original table. If it doesn't you may have to alter the list of columns or have a closer look at your data, it may look like duplicate data but actually is not.
When step 2 is done, you will have your original table, and "no_dups" will have all the rows without duplicates. At this point you can do any number of things - drop and rename tables, or delete all from the original and insert into the original, select * from no_dups.
If you're running into problems identifying duplicates, and you've added an identity column to "no_dups," you should be able to delete rows one by one using the identity column value.