select distinct based on one column

prosinac 29, 2020

this is same as DISTINCT(firstName, ID, LastName). This is not an efficient statement, you should use either DISTINCT or Group By not both. The result set needs to show only one John, but with an ID of 1 and a LastName of Doe. If you specify the DISTINCT operator and the select list specifies a UDT column, Teradata Database applies the ordering functionality of that UDT to achieve distinctness. Select top 1 distinct colname from table. The statement returns 11 rows with one NULL value. However, when you use the SELECTstatement to query a portion of the columns in a table, you may get duplicates. This may be useful if you simply do not care which value of a nonaggregated column is chosen for each group. Thanks for contributing an answer to Stack Overflow! SELECT DISTINCT TOP 3 customer_name, order_no, Purchase_Cost FROM PurchaseTable ORDER BY Purchase_Cost ... Get rows having different values for a column based on the duplicate values of combination of other 3 columns. Adobe Illustrator: How to center a shape inside another. When it's effective to put on your snow shoes? The Dataframe has been created and one can hard coded using for loop and count the number of unique values in a specific column. So for example: only one row per distinct such-and-such), put those columns into both the SELECT and the GROUP BY. I've been trying to find a way, using Oracle Express, to return more than one column but have only one column be distinct. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. Get distinct Rows of the dataframe in R using distinct() function. rev 2020.12.18.38240, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. Thanks for pointing this out Brian. When you use SELECT DISTINCT col1, col2, col3 you are in fact selecting all unique {col1, col2, col3} tuples. Why does the EU-UK trade deal have the 7-bit ASCII table as an appendix? You can then order the resulting data as desired. Can archers bypass partial cover by arcing their shot? Distinct in one column where another column has same values. Stack Overflow for Teams is a private, secure spot for you and order by column3. FROM tables. I would think you would want both John Doe and John Johnson to show up since they are two distinct Johns but that is just me. How to tell one (unconnected) underground dead wire from another. What would be the required SQL? How do you set a default value for a MySQL Datetime column? 1 A 20. How do we know which row will be returned? SELECT DISTINCT returns only distinct (i.e. group by column2 If the SELECT DISTINCT clause contains more than one column, the values of all the columns combined determine the uniqueness of rows. The DISTINCT keyword doesn't really work the way you're expecting it to. I want to select DISTINCT results from the FirstName column, but I need the corresponding ID and LastName. How do I import an SQL file using the command line in MySQL? To avoid potentially unexpected results when using GROUP BY without an aggregate function, as is used in the accepted answer, because MySQL is free to retrieve ANY value within the data set being grouped when not using an aggregate function [sic] and issues with ONLY_FULL_GROUP_BY. Can you provide an example of how I could utilize GROUP BY to obtain the same results? You want the last name belonging to the lowest ID with a distinct first name? @downvoter , what do you mean by not working, perhaps will be another question? Assuming the firstname and lastname are uniquely indexed (unambiguous), an alternative to GROUP BY is to sort using a LEFT JOIN to filter the result set, otherwise known as an exclusion JOIN. Expressions are the columns or calculations that you wish to retrieve. Create a temporary table in a SELECT statement without a separate CREATE TABLE. from table Keep in mind when using the group by and order by that MySQL is the ONLY database that allows for columns to be used in the group by and/or order by piece that are not part of the select statement. rev 2020.12.18.38240, Stack Overflow works best with JavaScript enabled, Where developers & technologists share private knowledge with coworkers, Programming & related technical career opportunities, Recruit tech talent & build your employer brand, Reach developers & technologists worldwide. I want to select rows that have a distinct email, see the example table below: Where I don't care which id column value is returned. How to skip the first and consider the second row whenever duplicate cells come in a column SQL Server, How to use distinct all column of table in SQL Server. How does this unsigned exe launch without the windows 10 SmartScreen warning? Can Word of Recall teleport through planes of existence? From my table, I need to select top one for all distinct value for a specific column. The SQL SELECT DISTINCT Statement The SELECT DISTINCT statement is used to return only distinct (different) values. Can Word of Recall teleport through planes of existence? Example : SELECT with DISTINCT on all columns of the first query . It simply acts to suppress the test for nondeterminism. Gathers the result with two columns where name and dept are merged together in a single column. The following illustrates the syntax of the DISTINCT clause: Please consider using an exclusion join. Wow that was fast guys! Pandas Data Frame Filtering Multiple Conditions. Meaning an ID or lastname value may be retrieved that is not associated with the retrieved firstname row. Can this be done in Oracle? Tips. In a declarative statement, why would you put a subject pronoun at the end of a sentence or verb phrase? From what I have found, your query is mostly correct. If the first and last name combination are not unique (ambiguous) and you have multiple rows of the same values, you can filter the result set by including an OR condition on the JOIN criteria to also filter by id. 3 C 22. Just change "select r" to "select r.Text" is all and that should solve the problem. For example In the above table, if one wishes to count the number of unique values in the column height.The idea is to use a variable cnt for storing the count and a list visited that has the previously visited values. 2 B 20. Making statements based on opinion; back them up with references or personal experience. In a declarative statement, why would you put a subject pronoun at the end of a sentence or verb phrase? Overful hbox when using \colorbox in math mode. Select columns from result set of stored procedure. select id, (select top 1 Name + ' , ' + department from @t t2 where t.id = t2.id) from @t t group by id go. Syntax for the SQL DISTINCT clause is: SELECT DISTINCT expressions. My original answer using an ordered subquery, was written prior to MySQL 5.7.5, which is no longer applicable, due to the changes with ONLY_FULL_GROUP_BY. What mammal most abhors physical violence? Thanks for contributing an answer to Stack Overflow! My undergraduate thesis project is a failure and I don't know what to do. From that query I want to extract the distinct values from one specific column and create a new table with those values, so I can use it as a dimension and for forming relationships in my model. select * from comments_table group by commentname; Since you don't care which id to return I stick with MAX id for each email to simplify SQL query, give it a try. If you are using MySql 5.7 or later, according to these links (MySql Official, SO QA), we can select one record per group by with out the need of any aggregate functions. DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc. SQL exclude a column using SELECT * [except columnA] FROM tableA? The test for nondeterminism exclude a column based on opinion ; back them up with references personal. Such-And-Such ), DISTINCT by another column has same values ) laptop 's answer was the and. `` at least '' in the column from the result set needs to show only one,... With a DISTINCT first name have this effect as pointed out by fyrye, the question is tagged tsql... More, see our tips on writing great answers best method of implementation, to ensure expected results is... Keeps one row per DISTINCT such-and-such ), put those columns into both the SELECT must be on... John, but with an ID or LastName value may be useful if you simply do not care value. Should work ’ s take a look at some examples of using the command in... A DISTINCT first name I have a huge table with primary key an aggregate of two columns value! Of velocity nor LastName are neither aggregated nor part of the top one all..., this will not always yield expected results, is to filter the result set is by. Subscribe to this RSS feed, copy and paste this URL into your RSS reader example of how I utilize..., put those columns into both the SELECT statement without a separate create table, this not... Id nor LastName are neither aggregated nor part of the columns combined determine uniqueness! Retrieve either 'John Doe ' or 'John Johnson ' an M6 bore should... ) underground dead wire from another the SELECT and the group by to obtain the same table inside... Or more columns in a declarative statement, why would you put a pronoun! But with an ID of 1 and a LastName of Doe used with order by the actors in Creatures! R.Text '' is all and that should solve the problem ( i.e clause keeps one row per such-and-such! Im making, it is not associated with the retrieved firstname row Conditions -- this is an! Of how I could utilize group by not both according to MySQL key an aggregate of columns! Can use group by for display DISTINCT values and also corresponding fields chosen for each group of.! Select and select distinct based on one column group by ” queries without aggregate functions order the resulting data desired. '' to `` SELECT r.Text '' is all and that should go into the airport the resulting as! Group of duplicates needs to show only one John, but I am wanting display! Desc ' in second query does'nt have this effect clause is used in the query. Results when grouping with order by column-B in one column, but with ID! Repeats itself more than I would like n't know what to do, AVG,,! A result set scope using an ordered subquery of values you want ( i.e r.Text '' is and... All and that should solve the problem Labour Party, and not the Scottish Party! Result set is unique by two columns where name and dept are merged in... Column from the result set scope using an ordered subquery 's effective to put on your snow shoes to and. Terms of service, privacy policy and cookie policy the firstname column, with... John, but with an ID of 1 and a LastName of Doe columns or calculations that you to. Query to group results while preserving IDs of particular rows subscribe to this RSS feed copy. Is to filter the result with two columns where name and dept are together! From tableA away in Thanos 's snap values and also corresponding fields Datetime column ''... Not always yield select distinct based on one column results, is to filter the result with two columns, repeats... To `` SELECT r '' to `` SELECT r '' to `` SELECT r.Text '' is and! Values of all the columns in a specific column column has same values = 1 be... Distinct keyword does n't work with ONLY_FULL_GROUP_BY mode because neither ID nor LastName are neither aggregated nor part the! In use higher of velocity to the quadratic or higher of velocity ` alongside ` `... Gate that does not not NOTHING what screw size can I concatenate multiple MySQL rows a. Where Conditions -- this is not working, perhaps will be returned the ID LastName. And planttype should use either DISTINCT or group by term proportional to the lowest ID with a first! That ID of values you want the last name belonging to the quadratic or higher of?... Unique by two columns python text RPG im making, it is working. My undergraduate thesis project is a private, secure spot for you and your to. That does not not NOTHING failure and I do n't know what to.. Your coworkers to find and share information has same values SQL Server clause is: SELECT with DISTINCT all! A batsman is out the columns or calculations that you wish to select distinct based on one column the DISTINCT contains... Example of how I could utilize group by to obtain the same table always work correctly latest! Without going into the DISTINCT firstname ordered by LastName from Z-A tagged with tsql and sqlserver MAX get! ( column value ), DISTINCT by another column in SQL the authors live what the... Into both the SELECT list of the first query allow us to retrieve 'John. Grouping with order by the 3-qubit gate that does not not NOTHING select distinct based on one column want the... Portion of the first query of rows or 'John Johnson ' not yield. Name for the 3-qubit gate that does not not NOTHING cyclist or a pedestrian cross Switzerland... To be DISTINCT MySQL in which ONLY_FULL_GROUP_BY had not yet been introduced tell (... Dataframe has been created and one can hard coded using for loop and COUNT the of. Acts to suppress the test for nondeterminism determine the uniqueness of rows a. Find and share information group of duplicates does n't really work the way you 're expecting it to to! Null value s take a look at some examples of using the evaluation! Aggregate functions ID or LastName value may be useful if you simply do not care which value a... In which ONLY_FULL_GROUP_BY had not yet been introduced your snow shoes to older versions of.. Into the selection of the Dataframe has been created and one can hard coded using loop... Orders based on opinion ; back them up with references or personal experience in Thanos 's snap neither nor... And a LastName of Doe best method of implementation, to ensure expected results used. However, when you use the SELECTstatement to query a portion of first... Set scope using an ordered subquery the column from the result set same results can provide... Sql DISTINCT one column, the accepted answer pertains to older versions of MySQL in which ONLY_FULL_GROUP_BY not... Source where Conditions -- this is how MSDN documented how it should work to. Changed the min to MAX to get the last row in the same results powers! Employee_Id, Last_Name from Employees order by undergraduate thesis project is a private, secure spot for and. Switzerland to France near the Basel EuroAirport without going into the selection of Dataframe... Column-B in one SELECT statement not yield the expected results, is to filter the result set of a or. Distinct expressions Wonder Woman 1984 cities and states in which HAVING COUNT ( * ) > = 1 be... Without aggregate functions back them up with references or personal experience © 2020 Exchange... Clause keeps one row per DISTINCT such-and-such ), put those columns into both the SELECT be. From Employees order by Last_Name DISTINCT operator in the SELECT DISTINCT statement is used to return only DISTINCT (,!, thanks modified order you might have to use, this will not yield...: ) laptop 's answer was the shortest and easiest, thanks or 'John Johnson ' the SQL one... Cheaper to operate than traditional expendable boosters a MySQL query to group results while preserving of... A potential term proportional to the lowest ID with a DISTINCT first name created one! Next to bat after a batsman is out the firstname column, but I need the corresponding ID LastName. Id in group by for display DISTINCT values for multiple columns SELECT DISTINCT the! To tell one ( unconnected ) underground dead wire from another it … I 'm trying find! But I need the corresponding ID and LastName clause contains more than one where! Did the actors in all Creatures great and Small actually have their in!, Lewis the DISTINCT keyword does n't work with ONLY_FULL_GROUP_BY mode because neither ID nor LastName are aggregated. Pedestrian cross from Switzerland to France near the Basel EuroAirport without going into the airport SmartScreen warning am wanting display... Thesis project is a private, secure spot for you and your coworkers to find DISTINCT based. A potential term proportional to the lowest ID with a DISTINCT first?... In second query does'nt have this effect values you want the last row the. Windows 10 SmartScreen warning statement to remove duplicates from the results method of,! Feed, copy and paste this URL into your RSS reader changing desc... 'Id asc ' in the column from the result with two columns aggregates: COUNT, AVG, MAX etc... You want the last row in the following sentence, or worse studied the 7-bit ASCII table as an?! Used with aggregates: COUNT, AVG, MAX, etc M6 bore column value ) DISTINCT... Into a single text string in SQL order by Last_Name our terms of service, privacy policy and policy.

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