Note: You have to specify the number of columns in the output. If you don't know how many there are, you can either:. Assuming you have a static number of date-ranges, you could achieve this using a window function as follows If you have dynamic columns you can create dynamic query using stuff to create list of columns and run this query as dynamic query to get all list of columns.Merge Multiple rows into one column without duplicates in Sql Server
Learn more. Asked 3 years, 3 months ago. Active 3 years, 3 months ago. Viewed 5k times. I have a database in which I have the following rows: ID Date start Date end a a a b c c What I got Multiple rows per person One start and end date per row In a not chronological order Select query which I want to return the following: ID Date start 1 Date end 1 Date start 2 Date end 2 Date start 3 Date end 3 a b c What I want: One row per person Multiple start and end dates per row In a chronological order Most things I was able to find wanted it in the same column, or wouldn't want it sorted on chronological order, so unfortunately those situations didn't apply to me.
I really have now clue how to solve this. Grafit Grafit 5 5 silver badges 28 28 bronze badges.
Ali Jan 4 '17 at Column order is not meaningful to SQL. You should be able to easily format the data in that from your original source table. To clear some things up. A person can have up to 12 dates it's residence periods between different countriesand I want to export the final result to an Excel to import somewhere else. That's why the column order should be right, otherwise the import wouldn't work well. Active Oldest Votes. If you don't know how many there are, you can either: Generate a dynamic SQL statement to do the count in advance.
Like this. Luckily someone already did that for you. But please note that this method is good for at the most rows within a group. Beyond that, you'll have major performance problems. SQLCLR aggregates have to serialize any intermediate results and that quickly piles up to quite a lot of work.
Keep this in mind! The syntax will be. Learn more. Asked 8 years, 5 months ago. Active 12 months ago. Viewed k times. Belgeler; yoksa Ruhsat FotokopileriMin. Instead do this in a reporting tool, front end code, etc. Active Oldest Votes. There are several methods. You can also try one of the XML methods e. Customfield AND v2. Code Magician Code Magician There is a very good tutorial here mssqltips.
Karthikeyan P Karthikeyan P 13 13 silver badges 20 20 bronze badges.File is currently in excel format. Some IDs may have only 1 row, but others have up to 30 rows. There are 5 variables per row including the ID number. View solution in original post. Well, if your designing an e.
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I would not recommend doing this if your just using this as data as it will make your programming far more complicated than it needs to be, you have the ideal structure already - fixed, if you change it to your suggestion then you need to know how many rows appear, program in to do array looping etc. Sorry, what do you mean cutting and pasting? That sounds like Excel, if so then you are producing a report - look at the link I gave with regards to doing this in the proc report which generates the Excel file.
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Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. When value in first and second row in the same column is the same or when there is value in first row and NULL in second row. I don't want to merge when value in first and second row in the same column is different. I think there's a simpler solution to the above answers which is also correct.
It basically gets the merged values that can be merged within a CTE, then merges that with the data not able to be merged. This works by creating all the mergeable rows through the use of Min and Max --which should be the same for each column within an ID and which usefully exclude NULL s--then appending to this list all the rows from the table that couldn't be merged.
Here's a slightly different earlier solution I gave that may offer different performance characteristics, and being more complicated, I like less, but being a single flowing query without a UNION I kind of like more, too. This uses similar logic as the first query to calculate whether a group should be merged, then uses this to create a grouping key that is either the same for all rows within an ID or is different for all rows within an ID. With a final Min Max would have worked just as well the rows that should be merged are merged because they share a grouping key, and the rows that shouldn't be merged are not because they have distinct grouping keys over the ID.
Depending on your data set, indexes, table size, and other performance factors, either of these queries may perform better, though the second query has some work to do to catch up, with two sorts instead of one. You mention the concepts of first and second.
How do you define this order? Place that order defining condition in here Learn more. Merge multiple rows with same ID into one row Ask Question. Asked 5 years, 1 month ago. Active 5 years, 1 month ago. Viewed 33k times. How can I merge multiple rows with same ID into one row.
Hemus San Hemus San 1 1 gold badge 4 4 silver badges 17 17 bronze badges.I came across a situation where I have to concatenate multiple rows a column into single string of text for reporting purpose. There are multiple ways to concatenate rows into string.
Now we will see a couple of the easiest techniques here. NOTE: If you notice the result produced by this method, there is a space added after every country name. Once the path specified as datathe value is treated as an atomic value and a space char is added to the XML.
An example query without data part is below. All you have to do is, declare a varchar variable and inside the coalesce, concat the variable with comma and the column, then assign the COALESCE to the variable. You may need a stored procedure or a function to do this operation and get the concatenated string value.
Unfortunately it will be available in the feature release of SQL Server. This new function is available from SQL Server onwards. In example1 there is a space after every country name. How do you get rid of that space where does it come from. The space is because of using data. A space character is added to the XML if the next item in the serialization is also an atomic value. Another option for row concatenation within categories, by using a correlated sub-query you can achieve similar levels of flexibility with a lot less code.
Here is another idea about how you can achieve the same using recursive CTE. Is very flexible and can be enhanced thoroughly, but I want to show only the proof of concept. Hi Cristinel Boboc, Good Idea. Thank you for sharing.
Hi, this is great. My doubt would be, what if we would like to have some 2 columns grouped? Say on this example, you would have another column with the continent and then the xml string with the countries within that group, can that be done using this function? This site uses Akismet to reduce spam.
Database Administrators Stack Exchange is a question and answer site for database professionals who wish to improve their database skills and learn from others in the community. It only takes a minute to sign up. I can't seem to get it to work in this case either, only seems to work on a single row. My query has to go through the whole table on its own and output these rows.
This is relatively trivial to do with a correlated subquery. You can't use the COALESCE method highlighted in the blog post you mention unless you extract that to a user-defined function or unless you only want to return one row at a time. Here is how I typically do this:.
combine multiple rows into one row in sql server
Be sure to use the right destination data type, varchar or nvarcharand the right length, and prefix all string literals with N if using nvarchar. If you're allowed to use CLR in your environment, this is a tailor-made case for a user-defined aggregate. I strongly suspect the query plan for Aaron's solution will not scale well as the input size grows.
I tried adding an index to the temp table, but that didn't help. EDIT: Well, I went to try to see if this actually was better, and it turns out the requirement that the comments be in a specific order is currently not possible to satisfy using an aggregate function.
I'm assuming adding this functionality to SQL Server opens a can of worms, because what would need to be changed in the execution plan is trivial. The aforementioned link says this is reserved for future use, so this could be implemented in the future on you're probably out of luck, though.
In any event, below is the code I used in case anyone else finds this useful even with the limitation. I'll leave the hacking part as an exercise for the reader. Note that I used AdventureWorks for test data. See my other answer for how the [dbo]. Sign up to join this community.
Rolling up multiple rows into a single row and column for SQL Server data
The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Combine column from multiple rows into single row Ask Question. Asked 7 years, 11 months ago.I need a way to roll-up multiple rows into one row and one column. I know I can roll-up multiple rows into one row using Pivotbut I need all of the data concatenated into a single column in a single row. In this tip we look at a simple approach to accomplish this.
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:. Check out the example below to walk through the code samples and final solution to roll-up multiple rows into a single row in SQL Server. Before we begin, we'll create some tables and sample data which the following script will do for us. Before going to the examples, we need to understand the workings of the commands mentioned above.
With this we can insert, replace or remove one or more characters. To do this we can use the STUFF command as follows to replace the first ; in the string with an empty string.
SQL Server: Concatenate Multiple Rows Into Single String
We will use the PATH option, which generates single elements for each row returned. Now that we see what each of these commands does we can put these together to get our final result. For each value from the inner query we are concatenating a ";" and then the actual value to have all of the data from all rows concatenated into one column. The below is the output for this query.
Here is an example that will rollup indexes into one row and show the columns that are part of the index as well as included columns if any exist. There are always several options to complete a task within SQL Server and we should take the time to explore the capabilities offered by the database before developing large and complex code. I hope this is one more of those examples that shows there are sometimes easier approaches than you think might be available.
Post a comment or let the author know this tip helped. All comments are reviewed, so stay on subject or we may delete your comment. Note: your email address is not published. Signup for our newsletter. I have read the privacy statement and understand I may unsubscribe at any time. Here's the link for the function. Example "D" is what you want.
Example "C" is mislabled and isn't what you want. I've a csv file which contains data with new lines for a single row i. I've loaded the data into sql but now I want to replace the second row data into 1st row with respective column values. I am not able to get this to work. I need to put this select into the Envision Argos Report generator and it is erroring out there.