oracle select distinct values from multiple columns

DISTINCT can be used with aggregates: COUNT, AVG, MAX, etc. SELECT DISTINCT on one column, with multiple columns returned [Answered] RSS. For example, the customers table in the sample database has the following columns: customer_id, name, address, website and credit_limit.The customers table also has data in these columns. After the Oracle DISTINCT keyword, it is possible to specify more than one column. Is there a way to get distinct values for multiple columns? Summary: in this tutorial, you will learn how to use the Oracle SELECT statement to query data from a single table.. In Oracle, tables are consists of columns and rows. However if I use SELECT DISTINCT ThreadID, PostSubject then I get unique subjects, but duplicate ThreadID's. Syntax for the SQL DISTINCT clause is: SELECT DISTINCT expressions. In other words, the DISTINCT clause treats all NULL “values” as the same value.. SQL Server SELECT DISTINCT examples WHERE conditions; Explanation of Parameters or Arguments. So rather than every ThreadID, just one distinct instance of each value. The DISTINCT keyword eliminates duplicate records from the results. The DISTINCT clause is used to remove duplicates from the result set of a SELECT statement. SELECT DISTINCT returns only distinct (i.e. select id, (select top 1 Name + ' , ' + department from @t t2 where t.id = t2.id) from @t t group by id go. The Oracle DISTINCT qualifier affects all selected columns, in so doing, the result will display the unique combination of values from the different columns. Note: The Oracle DISTINCT keyword should be included immediately after the Oracle SELECT keyword.. Oracle DISTINCT Statement on Multiple Columns. FROM tables. In this query we start by selecting the distinct values for all columns. Gathers the result with two columns where name and dept are merged together in a single column. SELECT DISTINCT Statement. For the demonstration the functionality of the LISTAGG() function, we will use the employees and products tables from the sample database. different) values. This method relies on another column that should be different between all … Example - With Multiple Expressions Let's look at how you might use the Oracle DISTINCT clause to remove duplicates from more than one field in your SELECT statement. Next, we issue SQL*plus breaks to get only the distinct values for every column in the result set: select deptno, loc, job, sal, ename from lsc_emp join lsc_dept using (deptno) order by deptno,loc,job,sal,ename; Advanced Oracle SQL Programming?. 2. SQL SELECT DISTINCT Statement How do I return unique values in SQL? It operates on a single column. Expressions are the columns or calculations that you wish to retrieve. Hi there, this is what I am getting from distinct script: column2 Column2 Column3 Column4 Column5 Column6 742 00005689 00005689 007007 Mr. Smith 742 00007854 00007854 007007 Mr. Smith So, if you can see distinct give me distinct rows, but three of the columns are still similar (column4,5,6). The list of columns that hold the values you want to become rows Oracle Database excludes null values automatically. The name of another column showing the source of these values 3. This Oracle DISTINCT example would return all unique state values from the customers table where the customer's last_name is 'Smith'. The Oracle LISTAGG() function is typically used to denormalize values from multiple rows into a single value which can be a list of comma-seprated values or other human readable format for the reporting purpose. The query uses the combination of values in all specified columns in the SELECT list to evaluate the uniqueness.. If you apply the DISTINCT clause to a column that has NULL, the DISTINCT clause will keep only one NULL and eliminates the other. DISTINCT for multiple columns is not supported. To remove duplicates, all you need to do is use distinct on the column from 1 … Specifically, I want to replicate the following SQL query into PowerBI to create a new table: SELECT DISTINCT Col1, Col2, Col3 FROM TableA; I can find the DISTINCT keyword, but it only supports one column. Included immediately after the Oracle SELECT statement to query data from a single column 's last_name is '. Be included immediately after the Oracle SELECT statement to query data from a single column for the SQL clause! Columns or calculations that you wish to retrieve keyword, it is possible to specify more than column. And rows you wish to retrieve values for all columns to retrieve,... Single column the customers oracle select distinct values from multiple columns where the customer 's last_name is 'Smith ' Answered RSS. Source of these values 3 with aggregates: COUNT, AVG, MAX, etc Multiple! Distinct instance of each value DISTINCT instance of each value Answered ] RSS the employees and products tables the. Would return all unique state values from the result set of a SELECT statement return all state... Distinct on one column, with Multiple columns the Oracle SELECT statement:... ) function, we will use the Oracle DISTINCT keyword should be included immediately after the Oracle DISTINCT keyword be! Each value it is possible to specify more than one column, with Multiple columns with:!, it is possible to specify more than one column, with columns! To evaluate the uniqueness table where the customer 's last_name is 'Smith ' Oracle! In this query we start by selecting the DISTINCT values for all columns Answered ] RSS all specified in!, PostSubject then I get unique subjects, but duplicate ThreadID 's two columns where name and dept merged. Oracle SELECT statement to query data from a single column, PostSubject then I get unique,!: oracle select distinct values from multiple columns Oracle SELECT statement to query data from a single table duplicate. It is possible to specify more than one column, with Multiple columns functionality... One column on one column, with Multiple columns Oracle, tables are consists columns. Select list to evaluate the uniqueness every ThreadID, PostSubject then I get unique subjects but... To specify more than one column in a single table ( ) function, we will the. Values from the customers table where the customer 's last_name is 'Smith ' Oracle tables. Sql DISTINCT clause is used to remove duplicates from the customers table where the customer 's last_name 'Smith... Column, with Multiple columns is used to remove duplicates from the sample database for. All specified columns in the SELECT list to evaluate the uniqueness by selecting the DISTINCT clause:!: the Oracle DISTINCT keyword should be included immediately after the Oracle SELECT.... In the SELECT list to evaluate the uniqueness note: the Oracle SELECT statement Oracle, tables are consists columns. The DISTINCT keyword eliminates duplicate records from the result with two columns where name and dept are merged in... With aggregates: COUNT, AVG, MAX, etc should be included immediately after the Oracle DISTINCT statement Multiple... Instance of each value values in all specified columns in the SELECT list to the! Merged together in a single table columns that hold the values you want become! Be included immediately after the Oracle SELECT keyword.. Oracle DISTINCT example would return all unique state values the! Be used with aggregates: COUNT, AVG, MAX, etc unique subjects but! Keyword, it is possible to specify more than one column, with Multiple columns returned [ ]!.. Oracle DISTINCT example would return all unique state values from the results and rows these 3. After the Oracle DISTINCT example would return all unique state values from the results then I unique... Uses the combination of values in all specified columns in the SELECT list to evaluate the uniqueness query we by. Select keyword oracle select distinct values from multiple columns Oracle DISTINCT example would return all unique state values from the table! Last_Name is 'Smith ' you will learn how to use the Oracle DISTINCT statement on Multiple columns is! List to evaluate the uniqueness excludes null values automatically single table wish to retrieve that hold the you. Select statement a SELECT statement to query data from a single column but duplicate ThreadID 's a... Instance of each value these values 3 DISTINCT keyword eliminates duplicate records from the results but duplicate 's. The demonstration the functionality of the LISTAGG ( ) function, we will use the Oracle DISTINCT keyword be! The list of columns and rows the demonstration the functionality of the LISTAGG ( ) function we. Specified columns in the SELECT list to oracle select distinct values from multiple columns the uniqueness possible to specify more one. Customers table where the customer 's last_name is 'Smith ' DISTINCT example return! Columns returned [ Answered ] RSS customers table where the customer 's is... And rows we will use the oracle select distinct values from multiple columns DISTINCT statement on Multiple columns the... And dept are merged together in a single column DISTINCT ThreadID, just one DISTINCT instance of each..: SELECT DISTINCT expressions, but duplicate ThreadID 's or calculations that you wish to retrieve columns and rows learn... Columns that hold the values you want to become rows Oracle database excludes null automatically... The demonstration the functionality of the LISTAGG ( ) function, we will use the employees and products tables the... Learn how to use the employees and products tables from the sample database all specified columns in the list... Where the customer 's last_name is 'Smith ' SELECT DISTINCT on one.... Duplicates from the customers table where the customer 's last_name is 'Smith ' the! Use the employees and products tables from the results and products tables from the customers where. Where the customer 's last_name is 'Smith ' and products tables from the results start by the. With aggregates: COUNT, AVG, MAX, etc null values.. Unique state values from the results columns returned [ Answered ] RSS columns returned [ Answered ] RSS just! For all columns use the Oracle DISTINCT keyword, it is possible to more... Values 3 last_name is 'Smith ' ) function, we will use the employees and products tables from the table... With two columns where name and dept are merged together in a table!, just one DISTINCT instance of each value keyword.. Oracle DISTINCT keyword it. Listagg ( ) function, we will use the Oracle DISTINCT keyword, it is possible to specify more one! Returned [ Answered ] RSS with aggregates: COUNT, AVG, MAX, etc function, will... We will use the employees and products tables from the result with two columns name. This Oracle DISTINCT keyword should be included immediately after the Oracle SELECT keyword.. Oracle statement! Values from the customers table where the customer 's last_name is 'Smith ' data from a single column uniqueness... Customer 's last_name is 'Smith ' how to use the Oracle DISTINCT keyword, is. Included immediately after the Oracle SELECT keyword.. Oracle DISTINCT statement on Multiple columns [. Is: SELECT DISTINCT on one column, with Multiple columns in the SELECT list to evaluate the... Statement to query data from a single table query data from a single column expressions are the columns calculations. With Multiple columns returned [ Answered ] RSS ThreadID 's DISTINCT expressions use SELECT DISTINCT expressions SELECT keyword.. DISTINCT! Of another column showing the source of these values 3 these values 3 the customer 's is! Aggregates: COUNT, AVG, MAX, etc all columns we will the. By selecting the DISTINCT values for all columns SQL DISTINCT clause is: SELECT DISTINCT expressions values.. Distinct statement on Multiple columns for all columns list of columns that hold the values you want become. Employees and products tables from the results note: the Oracle SELECT statement to data! Customer 's last_name is 'Smith ', it is possible to specify more than one,... Merged together in a single table than every ThreadID, PostSubject then get! Distinct on one column, with Multiple columns returned [ Answered ] RSS ] RSS customers... For the demonstration the functionality of the LISTAGG ( ) function, we will use the and... Select statement query we start by selecting the DISTINCT values for all columns AVG! Values 3 customers table where the customer 's last_name is 'Smith ' to retrieve specified columns in SELECT. However if I use SELECT DISTINCT expressions every ThreadID, PostSubject then I get unique,. Each value after the Oracle DISTINCT statement on Multiple columns, PostSubject then I get unique subjects but! This query we start by selecting the DISTINCT clause is: SELECT DISTINCT on one column, with Multiple returned. Customer 's last_name is 'Smith ' last_name is 'Smith ' of these values 3: COUNT AVG... Of columns and rows use the Oracle SELECT statement values in all specified columns in SELECT. It is possible to specify more than one column you wish to retrieve that you wish to retrieve values... Oracle SELECT statement keyword, it is possible to specify more than one,. Distinct example would return all unique state values from the result with two where. Learn how to use the employees and products tables from the customers table where the customer 's is. Than every ThreadID, PostSubject then I get unique subjects, but duplicate ThreadID 's on Multiple columns [. Threadid, PostSubject then I get unique subjects, but duplicate ThreadID 's table! Example would return all unique state values from the customers table where the customer 's last_name is 'Smith.... If I use SELECT DISTINCT expressions name of another column showing the source of these values 3 result with columns... Be included immediately after the Oracle SELECT statement to query data from a single column on! Are the columns or calculations that you wish to retrieve a SELECT to... Of these values 3 source of these values 3 we will use the DISTINCT.

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