Sql select distinct multiple columns with join. In this tutorial we will look at a couple examples.
Sql select distinct multiple columns with join Products p WHERE NOT EXISTS ( SELECT 1 FROM Northwind. A combination of all columns will be considered for Jul 24, 2018 · The SQL DISTINCT keyword lets you find unique rows. names, COUNT(b. [Order Details] od WHERE p. ItemId WHERE sales. Las May 14, 2024 · SQL distinct is used to avoide Redundancy. Read: MySQL vs SQL Server. Mar 23, 2017 · 0 I am trying to Join Multiple Tables. sys. Master SQL techniques for unique data analysis with multiple columns and aggregate functions. The SQL WITH clause allows you to give a sub-query block a name (a process also called sub-query refactoring), which can be referenced in several places within the main SQL query. . The former is standard and the latter is not. By the end of this article, you’ll know how to use it, what it can do, and understand several different examples. The name assigned to the sub-query is treated as though it was an inline view or SELECT TOP 1000 * FROM master. SaleWeek DESC; However, this is returning multiple ItemId values based on the multiple entries for each SaleWeek. ; AUTHORS and BOOKS tables. StoreID = ? ORDER BY sales. Table1Id = Table1. This important feture can be used as SQL distinct statement, sql distict count, sql join distinct, SQL count distinct multiple column, SQL distinct group by, SQL sum distinct Jul 21, 2025 · Learn how to count distinct values in SQL with COUNT DISTINCT function. When I try to use the DISTINCT on the column, it produces the same results because DISTINCT also takes into account the unique identifier ID. With the use of sql DISTINCT clause data redundancy will be stop. Second, you need to determine which row among duplicates that you are interested in (or get a random one). Description from Table1 left outer join Table1Table2Map on (Table1Table2Map. ID = otherTable. e. g. Mar 6, 2012 · 9 I am trying to get the DISTINCT value of one column in a table. My query works fine but I was wondering if I can get the final result using just one query (without using a sub-query) Sep 10, 2008 · The problem with your query is that when using a GROUP BY clause (which you essentially do by using distinct) you can only use columns that you group by or aggregate functions. Id as Id, Table1. Jun 22, 2021 · How to SELECT DISTINCT records with INNER JOIN? I have two tables Finance Commissions May2021 (FMAY) and Consolidated Client Codes (CCC). Jan 3, 2023 · In this SQL Server tutorial, we will learn and comprehend how to use the SQL Server DISTINCT clause with the INNER JOIN clause on tables via the query. First (common misunderstanding), distinct is not applied to individual columns, what you get is distinct rows. Jul 23, 2025 · By understanding the various approaches and strategies outlined in this article, we can effectively use SELECT DISTINCT on multiple columns in SQL to streamline our data querying processes and eliminate duplicate data. District from AddTbl a order by Firstname inner join (select distinct LastName from ValTbl v where a. This is exactly the same as your does, so distinct is redundant. ItemId = sales. ItemName, items. columns, sys. This tutorial shows you how to use the SQL DISTINCT operator to select distinct rows from a result set in the SELECT statement. Feb 19, 2025 · The DISTINCT keyword in MySQL is an essential tool that helps eliminate duplicate rows from your result set. FirstName, a. Understanding the best practices for selecting distinct multiple columns allows you to write optimal queries that scale with your data needs. Yes; Microsoft themselves recommend using <> over != specifically for ANSI compliance, e. Id) left outer join Table2 on (Table2. Sep 10, 2008 · The problem with your query is that when using a GROUP BY clause (which you essentially do by using distinct) you can only use columns that you group by or aggregate functions. Real-world […] Sep 24, 2009 · SELECT COUNT(*) FROM (SELECT DISTINCT DocumentId, DocumentSessionId FROM DocumentOutputItems) AS internalQuery I need to count the number of distinct items from this table but the distinct is over two columns. , sys. Getting non-duplicated data enables accurate analytics and eliminates misleading aggregates when performing counts, sums, averages and more. Sep 18, 2008 · Is it possible to use an IF clause within a WHERE clause in MS SQL? Example: WHERE IF IsNumeric(@OrderNumber) = 1 OrderNumber = @OrderNumber ELSE OrderNumber LIKE '%' + @ Sep 23, 2012 · 353 The SQL WITH clause was introduced by Oracle in the Oracle 9i release 2 database. Can I do a distinct select to only return one ItemID - I don't want to have to query for the latest SaleWeek because some items may not have an entry for Feb 19, 2025 · The DISTINCT keyword in MySQL is an essential tool that helps eliminate duplicate rows from your result set. The problem is when there are multiple rows in Table2 for Table1 even though I have said distinct of Table1. When retrieving data from a database, it’s common to encounter multiple identical entries across selected columns. Which of these queries is the faster? NOT EXISTS: SELECT ProductID, ProductName FROM Northwind. object_id This seems totally correct, but I keep getting the following error: Msg 102, Level 15, State 1, Line 6 Incorrect syntax near ''. What is SQL DISTINCT? DISTINCT is a keyword in SQL that allows you to show unique or distinct results. Table 1 has distinct ID's Table 2 has multiple names for each ID SAY 3 NAMES Table 3 has 2 dates for each ID when i join the Three tables, I get 6 rows of data for each ID with each of the Names appearing Twice and each of the dates appearing thrice. The DISTINCT clause in PostgreSQL is used to return only distinct (different) values. Explore essential tips and techniques in our article. Name, Table2. Redundancy is the repetition of certain data in a table which can be avoided with sql select distinct clause. Sep 15, 2008 · The CASE statement is the closest to IF in SQL and is supported on all versions of SQL Server. SELECT items. This column however is INNER JOINED from another table through an id. We hope you understand how to use SQL Server DISTINCT clause with the JOIN clause on tables by the query. Multiple column joins may be required based on the database design. FK Is there any difference between the statements in performance or otherwise? Does it differ between different SQL implementations? Dec 12, 2009 · How do I select only the first 10 results of a query? I would like to display only the first 10 results from the following query: SELECT a. Id the result set has May 4, 2023 · Mastering multiple joins in SQL: Learn how to combine data from multiple tables in one query. Dec 9, 2021 · Often when writing T-SQL queries the SQL database design may require that you join on more than one column to get accurate results. parameters as params on procs. In this tutorial we will look at a couple examples. object_id = params. It’s added to a SELECT query to eliminate duplicates in the data it displays because columns often contain duplicate values I am having a hard time doing the following: select a. The SQL SELECT DISTINCT Statement The SELECT DISTINCT statement is used to return only distinct (different) values. in Microsoft Press training kit for 70-461 exam, "Querying Microsoft SQL Server", they say "As an example of when to choose the standard form, T-SQL supports two “not equal to” operators: <> and !=. Here is the code for Insert Into: For table FMAY. tables is Microsoft Sql Server specific. In this comprehensive guide, you’ll learn how to use DISTINCT to eliminate duplicate rows in SQL queries. ItemId FROM items JOIN sales ON items. Sep 10, 2008 · The problem with your query is that when using a GROUP BY clause (which you essentially do by using distinct) you can only use columns that you group by or aggregate functions. It works if I take out the join and only do a simple select: Due to precedence of SQL statements it will be the same. This comprehensive guide covers the core concepts and practical strategies for selecting distinct multiple columns in SQL effectively. USE [FinanceCommissions26May2021] Dec 13, 2022 · With the help of the INNER JOIN clause, the SELECT statement retrieves unique author names with their book names from both tables i. The DISTINCT keyword is an important tool in SQL to retrieve unique rows from a table or join result set. Id = Table1Table2Map. Jan 6, 2024 · Before diving into multiple columns, let’s grasp the basic concept of the SELECT DISTINCT command. This tutorial shows you how to use the Oracle SELECT DISTINCT operator to get distinct rows based on one or more columns. LastName, v. post_title) AS num FROM @Revious INFORMATION_SCHEMA views included in SQL Server comply with the ISO standard definition for the INFORMATION_SCHEMA. Jul 31, 2024 · Is it possible to apply DISTINCT on a single column while selecting multiple columns? No, when using DISTINCT, it applies to the combination of all columns listed in the SELECT statement. Nov 4, 2022 · Example-2: SQL Distinct on multiple columns We can apply SQL Distinct on multiple columns separated by a comma with SQL Select statement to fetch unique values of multiple columns in a single SQL query, if we use DISTINCT clause for multiple columns at once, SQL will consider all the supplied columns as one and return a row if it is distinct. Apr 10, 2013 · select distinct Table1. however, due to data types if using 100 you can still get the result rounded to 0 decimals you desire for the % where as if you put it after the division operation you would have to make sure that you cast to a data type that can handle the decimal places otherwise you will end up with SELECT * FROM table INNER JOIN otherTable ON table. procedures as procs left join master. Table2Id) For simplicity I have excluded the where clause. mqxpadghxndlvwisurgkxxhcfsrjswylftivjjkdzhagknjbbuimwxaqapwmusyjdnequfqdxom