How to select multiple IDs in a row?
To only get the result (s) once, distinct. This will get users which have 3 lines (having…count) and then you specify which lines are permitted. Note that if you don’t have a UNIQUE KEY on (user_id, ancestry), a user with ‘id, england’ that appears 3 times will also match… so it depends on your table structure and/or data.
Can a user have multiple rows on a table?
A user can have multiple rows on the table, as a user can have ancestors from multiple countries. My question is this: how do I select users whose ancestors hail from multiple, specified countries?
How to select rows with same ID but different liefnr?
I would like to select the ARIDNR that occurs more than once with the different LIEFNR. The output should be something like: The idea is to use the inner query to identify the records which have a ARIDNR value that occurs 1+ times in the data, then get all columns from the same table based on that set of values.
Can you select more than one user ID?
To clarify: Yes, the user_id / ancestry columns make a unique pair, so a country would not be repeated for a given user. P.P.S. I am looking for users who hail from all 3 countries – England, France, AND Germany (and the countries are arbitrary). P.P.P.S. I am not looking for answers specific to a certain RDBMS.
How to get single records when duplicate records exist in a table?
In the query below, the sub-query retrieves each customer’s maximum Order_ID in order to uniquely identify each order. 89 records returned in the query result. Note that the data in the column on which we apply max or min function must be unique.
How to select a single ID that meets multiple criteria?
The last line means the user’s ancestry has all 3 countries. SELECT DISTINCT (user_id) FROM [user] WHERE user.user_id In (select user_id from user where ancestry = ‘England’) And user.user_id In (select user_id from user where ancestry = ‘France’) And user.user_id In (select user_id from user where ancestry = ‘Germany’);`
When to use singleordefault in C # LINQ?
You can add SingleOrDefault and check for null if you are not sure if answer exists. Or you can add Where clause to get more than one answer, like: Above snippet will not fail if there is no answer to question and it will return empty sequence for it.
How to roll up multiple rows into one row?
Rolling up data from multiple rows into a single row may be necessary for concatenating data, reporting, exchanging data between systems and more. This can be accomplished by: The solution proposed in this tip explores two SQL Server commands that can help us achieve the expected results. The SQL Server T-SQL commands used are STUFF and FOR XML.