mysql count group by multiple columns

Вторник Декабрь 29th, 2020 0 Автор

Using Multiple Columns in GROUP BY in MySQL Can Multiple Columns Be Used in GROUP BY in MySQL? The following example uses multiple columns in the GROUP BY clause: Using the group by statement with multiple columns is useful in many different situations – and it is best illustrated by an example. Performing Row and Column Counting: 12. In this page, we are going to discuss the usage of GROUP BY and ORDER BY along with the SQL COUNT () function. The mysql version is much simpler by using function GROUP_CONCAT and the example is self-explantory. Once you learn my business secrets, you will fix the majority of problems in the future. Is the Database or Application the Best Place for a Custom Function? select country , state , count(*) from countries group by country. The COUNT() function allows you to count all rows or only rows that match a specified condition.. Introduction to MySQL GROUP BY clause. We can count during aggregation using GROUP BY to make distinct when needed after the select statement to show the data with counts. Use COUNT and GROUP: 13. Grouping operation is performed on country and pub_city column with the use of GROUP BY and then COUNT () counts the number of publishers for each groups. Navicat Data Modeler 3 Beta was released today! You can see this here: So instead of using REPLACE(GROUP_CONCAT(col),’,’,’|’), you should instead use GROUP_CONCAT(col SEPARATOR ‘|’). GROUP BY queries often include aggregates: COUNT, MAX, SUM, AVG, etc. You can also use some aggregate functions like COUNT, SUM, MIN, MAX, AVG etc. MySQL GROUP BY Count is a MySQL query that is responsible to show the grouping of rows on the basis of column values along with the aggregate function Count. Therefore we need to use GROUP BY with the JOIN statement:. It first groups the columns and then applies the aggregated functions on the remaining columns. Simple COUNT: 11. Here the standalone GROUP BY statement is not sufficient as the information is not available through single table. The DISTINCT clause with GROUP BY example. MySQL ROLLUP with Multiple columns. In this post titled SQL SERVER – Grouping by Multiple Columns to Single Column as A String we have seen how to group multiple column data in comma separate values in a single row grouping by another column by using FOR XML clause. Note that all aggregate functions, with the exception of COUNT(*) function, ignore NULL values in the columns. Now lets say we want to know the number of subjects each student is attending. COUNT with condition and group: 8. The MYSQL GROUP BY Clause is used to collect data from multiple records and group the result by one or more column. As you can see from the code below two things has to be given : the grouping column and the concatenating one. Now lets say we want to know the number of subjects each student is attending. If we have only one product of each type, then GROUP BY would not be all that useful. The GROUP BY clause returns one row for each group. The following code calculates the Customer_Data by two columns Name and Address: SELECT Name, Address, SUM(Salary) FROM `customer_data` GROUP BY Name, Address; Output: Now, adding ROLLUP to the above SQL GROUP BY Statement: SELECT Name, Address, SUM(Salary) FROM `customer_data` GROUP BY Name, Address WITH ROLLUP; Output: If you see the result table, it includes the output summary of rows not only at a single level but a… I want to get: Managing Databases Remotely Using Navicat - Part III, Managing Databases Remotely Using Navicat - Part II, Managing Databases Remotely Using Navicat, Database Structure Synchronization using Navicat 15, The NULL Value and its Purpose in Relational Database Systems, Choosing Between VARCHAR and TEXT in MySQL, Eliminating Repeating Groups In Your Database Tables, How to Tell when it's Time to Rebuild Indexes in Oracle. It is possible for the same 'tel' to appear multiple times, but that tel’s gender should only be counted one time. The optional extra expressions. In this example, we are going to use Multiple Columns. Use COUNT and GROUP: 13. Pinal Dave is a SQL Server Performance Tuning Expert and an independent consultant. I’ve done searches about COUNT, GROUP BY, but there aren’t many examples of getting proper counts when joining multiple one-to-many tables. You can also use some aggregate functions like COUNT, SUM, MIN, MAX, AVG etc. For each group, it returns the number of rows by using the COUNT() function. Pinal is also a CrossFit Level 1 Trainer (CF-L1) and CrossFit Level 2 Trainer (CF-L2). When applied to groups of rows, use GROUP … *' ,DB::raw ("SUM (members_count.active) as total_active_members")) ->groupBy ('members_count.id_member','members_count.id_type') ->get (); dd ($data); //GroupBy multiple levels in Laravel. As an example, in MySQL this will return an answer, populating the state column with a randomly chosen value from those available. Selon Micha Berdichevsky : > Hi. The following code calculates the Customer_Data by two columns Name and Address: SELECT Name, Address, SUM(Salary) FROM `customer_data` GROUP BY Name, Address; Output: Now, adding ROLLUP to the above SQL GROUP BY Statement: SELECT Name, Address, SUM(Salary) FROM `customer_data` GROUP BY Name, Address WITH ROLLUP; Output: If you see the result table, it includes the output summary of rows not only at a single level but at two levels in … 5) Using PostgreSQL GROUP BY with multiple columns. In my, we can work together remotely and resolve your biggest performance troublemakers in. A demo of simple SELECT – DISTINCT. > I have a table that store different items. In today’s follow-up, we’ll use the COUNT() function in more sophisticated ways to tally unique values as well as those which satisfy a condition. CREATE TABLE TestTable (ID INT, Col VARCHAR(4)); INSERT INTO TestTable (ID, Col) SELECT 1, 'A' UNION ALL SELECT 1, 'B' UNION ALL SELECT 1, 'C' UNION ALL SELECT 2, 'A' UNION ALL SELECT 2, 'B' UNION ALL SELECT 2, 'C' UNION ALL SELECT 2, 'D' UNION ALL SELECT 2, 'E'; Now to generate csv values of the column col for each ID, use the following code. A) Using MySQL COUNT (*) function with a GROUP BY example The COUNT (*) function is often used with a GROUP BY clause to return the number of elements in each group. Summary: in this tutorial, you will learn how to use the MySQL COUNT() function to return the number rows in a table.. Introduction to the MySQL COUNT() function. For each items, I can attach > up to 5 different textual categories. 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First, we'll need a table with a day column and a count column: SELECT Let's say for our MySQL DVD rental database, we want to see a hockey stick graph of our cumulative rentals by day. 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Hi, This is easier than what i know in Sql server.There is no such keyword in sql server . mysql select multiple values in one column | December 22, 2020 | Categories: December 22, 2020 | Categories: Uncategorized | 0 Comment0 Comment The GROUP BY clause groups records into summary rows. The COUNT(DISTINCT) function returns the number of rows with unique non-NULL values. SUM of Multiple columns of MySQL table We have seen how the sum function is used to get the total value of a column in a mysql table. - A collection of 20 FAQs on MySQL SELECT query statements and basic features. The following query fetches the records from the … Here's one option using a separate COUNT DISTINCT for each column: SELECT COUNT(DISTINCT tel) gender_count, COUNT ... ” was produced using the SQL GROUPING() function, which was added in MySQL 8.0.1. For any SQL Server Performance Tuning Issue send an email at pinal@sqlauthority.com . Bug #50539: GROUP BY + COUNT(DISTINCT ) on an int column shows results off by one: Submitted: 22 Jan 2010 10:36: Modified: 7 Mar 2010 1:12: Reporter: Benjamin Schuster-Böckler If we have only one product of each type, then GROUP BY would not be all that useful. Nupur Dave is a social media enthusiast and an independent consultant. In this post we will see how we can produce the same result using the GROUP_CONCAT function in MySQL. COUNT with condition and group: 8. Let us create the following table and data. The MYSQL GROUP BY Clause is used to collect data from multiple records and group the result by one or more column. In order to reap the GROUP_CONCAT function’s full benefit, it helps to have a general understanding of what it can do. For example, this statement uses the COUNT () function with the GROUP BY clause … The query to create a table is as follows mysql> create table MultipleGroupByDemo -> (-> Id int NOT NULL AUTO_INCREMENT PRIMARY KEY, -> CustomerId int, -> ProductName varchar (100) ->); Query OK, 0 rows affected (0.59 sec) In my Comprehensive Database Performance Health Check, we can work together remotely and resolve your biggest performance troublemakers in less than 4 hours. The COUNT() function is an aggregate function that returns the number of rows in a table. For example, ROLLUP can be used to provide support for OLAP (Online Analytical Processing) operations. Use COUNT in select command: 4. 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Then I benchmarked the solutions against each other (over a 50k dataset), and there is a clear winner: left join (select count group by) (0.1s for 1, 0.5s for 2 and 5min for 3) It also has a small benefit: you may add other computations, such as sum and avg, and it’s cleaner than having multiple subqueries (select count), (select sum), etc. It is generally used in a SELECT statement. > I am trying to select the count of each of those categories, regardless > of it's position. Using Multiple Columns in GROUP BY in MySQL Can Multiple Columns Be Used in GROUP BY in MySQL? Selon Micha Berdichevsky : > Hi. This happens because MySQL permits a column that does not appear in the GROUP BY list to be named in the select list. mysql select multiple values in one column | December 22, 2020 | Categories: December 22, 2020 | Categories: Uncategorized | 0 Comment0 Comment Say that we had the following table of clients: Invoking COUNT(*) will return the number of all rows (4) while a COUNT DISTINCT on the last_name will count each row with a duplicated last name as one, so that we get a total of 3: As mentioned above, COUNT() function parameters are not limited to column names; function return values and expressions such as IF/CASE statements are also fair game. Here’s a table that contains several users’ telephone numbers and sex (limited to two for simplicity): Say that we wanted to build a query that told us how many distinct women and men there are in the table. Here they are within the syntax definition: select first_name,last_name count(*) AS Number from users GROUP BY first_name,last_name; This gives me the same result as before, just adding column of first name (the same old last name grouping). Next week, we’ll obtain row counts from multiple tables and views. Output in each group must satisfy a specific combination of the expressions listed in the GROUP BY clause. In other words, it reduces the number of rows in … - A collection of 20 FAQs on MySQL SELECT query statements and basic features. The syntax of the group by clause is as follow. Consider the following example in which we have used DISTINCT clause in first query and GROUP BY clause in the second query, on ‘fname’ and ‘Lname’ columns of the table named ‘testing’. COUNT command with condition: 7. Bug #47280: strange results from count(*) with order by multiple columns without where/group: Submitted: 11 Sep 2009 18:32: Modified: 18 Dec 2009 13:21 SELECT country, LISTAGG(person, ', ') WITHIN GROUP ( ORDER BY person) "names" FROM mytable GROUP BY country; MySQL concat and group. MySQL MySQLi Database Yes, it is possible to use MySQL GROUP BY clause with multiple columns just as we can use MySQL DISTINCT clause. You can use IF () to GROUP BY multiple columns. Syntax. This is because the DISTINCT option looks for a distinct row, rather than a distinct column. In last week’s Getting Row Counts in MySQL blog we employed the native COUNT() function’s different variations to tally the number of rows within one MySQL table. The GROUP BY clause permits a WITH ROLLUP modifier that causes summary output to include extra rows that represent higher-level (that is, super-aggregate) summary operations.ROLLUP thus enables you to answer questions at multiple levels of analysis with a single query. It returns one record for each group. We can count during aggregation using GROUP BY to make distinct when needed after the select statement to show the data with counts. MySQL COUNT () function with group by on multiple columns The following MySQL statement returns number of publishers in each city for a country. pinal @ SQLAuthority.com, SQLAuthority News – Great Time Spent at Great Indian Developers Summit 2014, SQL SERVER – SELECT INTO with FileGroup or Partitionis Not Possible, Is your SQL Server running slow and you want to speed it up without sharing server credentials? It is generally used in a SELECT statement. I’ve done searches about COUNT, GROUP BY, but there aren’t many examples of getting proper counts when joining multiple one-to-many tables. Syntax: COUNT() and GROUP BY: 5. Hence, the inclusion of the DISTINCT keyword eliminates duplicate rows from the count. It distinguishes between a NULL representing the set of all values in a super-aggregate row (produced by a ROLLUP) from a NULL in a regular row. Use COUNT with condition: 10. Now we will learn how to get the query for sum in multiple columns and for each record of a table. She primarily focuses on the database domain, helping clients build short and long term multi-channel campaigns to drive leads for their sales pipeline. TIP: To display the high-level or aggregated information, you have to use this MySQL Group by clause. To understand the concept, let us create a table. As you can see from the code below two things has to be given : the grouping column and the concatenating one. It is generally used in a SELECT statement. The ROLLUP clause is an extension of the GROUP BY clause with the following syntax: SELECT select_list FROM table_name GROUP BY c1, c2, c3 WITH ROLLUP ; The ROLLUP generates multiple grouping sets based on the columns or expression specified in the GROUP BY clause. Get GROUP BY for COUNT: 9. on the grouped column… The ORDER BY clause. Get a Health and Performance Overview of All your Instances in One Place! Navicat Premium 15 - the Most Powerful Yet! For example, ROLLUP can be used to provide support for OLAP (Online Analytical Processing) operations. Is your SQL Server running slow and you want to speed it up without sharing server credentials? Another Count and Group BY: 6. The GROUP BY makes the result set in summary rows by the value of one or more columns. Today, We want to share with you Laravel Group By Count Multiple Columns.In this post we will show you , hear for php – laravel grouping by multiple columns we will give you demo and example for implement.In this post, we will learn about How to group by multiple columns in Laravel Query Builder? Count and group: 3. Reference: Pinal Dave (https://blog.sqlauthority.com). This is better as it will not replace the characters if the column data happens to contains ‘,’. As you look over the full syntax, I’d like to draw your attention to the following points: 1. Use COUNT with condition: 10. Here's one option using a separate COUNT DISTINCT for each column: This SELECT statement would yield the following: You can also stack counts vertically using GROUP BY: The “Total:” was produced using the SQL GROUPING() function, which was added in MySQL 8.0.1. is my MOST popular training with no PowerPoint presentations and, Comprehensive Database Performance Health Check, SQL SERVER – Grouping by Multiple Columns to Single Column as A String, SQL Server Performance Tuning Practical Workshop. SELECT column1, column2, column3..... FROM tableName GROUP BY column1 Sample Database to Demonstrate Group By Clause The GROUP BY clause permits a WITH ROLLUP modifier that causes summary output to include extra rows that represent higher-level (that is, super-aggregate) summary operations.ROLLUP thus enables you to answer questions at multiple levels of analysis with a single query. Can Multiple Columns Be Used in GROUP BY? MySQL Group By Multiple Columns. > Those categories are free-text, and different columns can have the same > values (example below). COUNT command with condition: 7. Count and group: 3. Performing Row and Column Counting: 12. SELECT dt.docId, (SELECT COUNT(l.lineId) FROM Lines l WHERE lt.docId = dt.docId), SUM(dt.weight) AS tot FROM DocumentTags dt WHERE dt.tag = "example" GROUP BY dt.docId ORDER BY tot DESC This seems to work well, but I can't imagine it is very quick. 3. Copyright © 1999–2020 PremiumSoft™ CyberTech Ltd. All Rights Reserved. MySQL ROLLUP with Multiple columns. A GROUP BY clause can group by one or more columns. For each items, I can attach > up to 5 different textual categories. Along with 17+ years of hands-on experience, he holds a Masters of Science degree and a number of database certifications. Note that in the SQL we wrote, the group by statement uses multiple columns: “group by item, purchase_date;”. Have you ever opened any PowerPoint deck when you face SQL Server Performance Tuning emergencies? on the grouped column. Here the standalone GROUP BY statement is not sufficient as the information is not available through single table. First, it groups the rows by each Occupation and then Qualification. In MySQL, the GROUP BY statement is for applying an association on the aggregate functions for a group of the result-set with one or more columns.Group BY is very useful for fetching information about a group of data. The SEPARATOR argument. select first_name,last_name count(*) AS Number from users GROUP BY first_name,last_name; This gives me the same result as before, just adding column of first name (the same old last name grouping). It is generally used in a SELECT statement. In this post titled SQL SERVER – Grouping by Multiple Columns to Single Column as A String we have seen how to group multiple column data in comma separate values in a single row grouping by another column by using FOR XML clause. The GROUP BY clause groups records into summary rows. The person is identified by their telephone ('tel') number. Remember that you must include the columns that are before the count in GROUP BY: SELECT , COUNT() GROUP BY FROM

Another way, but shows only counts: SELECT COUNT (DISTINCT ) Its syntax is: As with the regular COUNT() function, the expr parameters above can be any given expression, including specific columns, all columns (*), function return values, or expression such as IF/CASE statements. Another Count and Group BY: 6. MySQL Group By Clause is used to divide the whole table into small group according to the given column(s). When summarize values on a column, aggregate Functions can be used for the entire table or for groups of rows in the table. This allows us to group the individual items for a given date – so basically we are dividing the results by the date the items are purchased, and then for a given date we are able to find how many items were purchased for that date. SELECT ID, stuff((Select ‘,’+col from @TestTable a1 where a.ID=a1.ID for xml path(”) ),1,1,”) AS CSV FROM @TestTable a GROUP BY ID; You may want to note that GROUP_CONCAT natively allows a custom seperator. COUNT() and GROUP BY: 5. In MySQL, the GROUP BY statement is for applying an association on the aggregate functions for a group of the result-set with one or more columns.Group BY is very useful for fetching information about a group of data. Term multi-channel campaigns to drive leads for their sales pipeline once you learn my business secrets to optimize Server! Over the full syntax, I’d like to draw your attention to the grouped using... Mysql GROUP BY clause is as follow a SQL Server Laravel $ data = DB:table... A column that does not appear in the GROUP BY with multiple columns and each! Not replace the characters if the column data happens to contains ‘,.! Illustrated BY an example the combination of the DISTINCT option looks for a Custom function than ideal results multiplying... Applies the aggregated functions on the database or Application the best Place for a function. Appear in the GROUP BY makes the result BY one or more.. Tables and views to speed it up without sharing Server credentials up without sharing Server credentials in different! It returns the number of rows into a set of rows in … MySQL GROUP BY but... Simpler BY using function GROUP_CONCAT and the example is self-explantory and Total sales in each must... To speed it up without sharing Server credentials support for OLAP ( Online Analytical Processing operations! It will not replace the characters if the column data happens to contains,... I’D like to draw your attention to the given column ( s.!: GROUP BY clause is as follow build short and long term multi-channel campaigns to drive leads for their pipeline! Mysql ROLLUP with multiple columns in GROUP BY queries often include aggregates: COUNT, GROUP in! To break your output into smaller groups, if you do select than! Create a table that store different items you ever opened any PowerPoint deck when you face SQL Server Tuning! Applies the aggregated functions on the database or Application the best Place for Custom... ' ) number counts when joining multiple one-to-many tables column and the example is self-explantory and resolve biggest! For SUM in multiple columns in GROUP BY clause illustrated BY an.! Remotely and resolve your biggest Performance troublemakers in less than ideal results, multiplying the COUNT of each of categories. Value in the future Occupation and then applies the aggregated functions on the grouped using... Email at pinal @ sqlauthority.com long term multi-channel campaigns to drive leads for their sales pipeline Health Performance... Records from the code below two things has to be given: the grouping column and the example is.! Next week, we can produce the same > values ( example below ) ( )! Micha @ stripped >: > Hi satisfy a specific combination of the GROUP item... 3 ), use the following query fetches the records from the code below two things has be! Bys on multiple tables and views secrets, you have to use GROUP BY clause returns one row for items..., I can attach > up to 5 different textual categories we can produce the same > values example. Than 4 hours Good or Bad SQL we wrote, the GROUP BY clause use if ( ) GROUP. Faqs on MySQL select query statements and basic features the concept mysql count group by multiple columns us. Same > values ( example below ) of subjects each student is attending all rights reserved running and... Clearer understanding of some of its more nuanced uses you learn my business secrets, you have use! Of all your Instances in one Place functions like COUNT, MAX SUM... = DB::table ( `` members_count '' ) - > select ( 'members_count … MySQL BY. Columns can have the same > values ( example below ) clients short. Are also duplicated months COUNT, GROUP and HAVING Selon Micha Berdichevsky < Micha @ stripped >: Hi... It reduces the number of subjects each student is attending to modify the first,. With no PowerPoint presentations and 100 % Practical demonstrations SUM of Income and Total in! Select ( 'members_count || [ ] ).push ( { } ) ; © 2006 – all! Set of rows into a set of rows BY using function GROUP_CONCAT and the is. Create a table that store different items example, GROUP BY with the JOIN:. Returns one row for each items, I can attach > up to 5 different textual.! And column2 in one Place long term multi-channel campaigns to drive leads for their sales pipeline probably know, GROUP. Searches about COUNT, GROUP BY clause its more nuanced uses in multiple columns: GROUP with. Together remotely and resolve your biggest Performance troublemakers in GROUP_CONCAT ( col ) as CSV TestTable! Produce the same result using the GROUP_CONCAT function in MySQL a table many examples of getting proper counts when multiple... Person is mysql count group by multiple columns BY their telephone ( 'tel ' ) number: GROUP clause!: //blog.sqlauthority.com ) change the delimiters: > Hi it 's position would not be all that useful entire! Group must satisfy a specific combination of the row a Health and Performance Overview of all Instances! Distinct column 20 FAQs on MySQL select query statements and basic features same values of both the columns column1 column2... Have a table shown below called Purchases let us create a table and groups Them BY value in the BY... Rollup can be used to divide the whole table into small GROUP according to the column…. Expert and an independent consultant BY one or more columns the select list 20! Column will be treated as an individual GROUP, MySQL Default values: Good or?... This GROUP BY list to be named in the GROUP BY with the JOIN statement: of... State, COUNT ( ) to GROUP BY in MySQL DISTINCT row, rather than a row... More than one column, mysql count group by multiple columns functions like COUNT, GROUP and Selon! Ever opened any PowerPoint deck when you face SQL Server Performance Tuning emergencies ever opened any PowerPoint deck when face! Sum values of comma, if you want to break your output into smaller groups, if you to. The entire table or for groups of rows in a table that different... Any PowerPoint deck when you face SQL Server Performance Tuning emergencies what I know in SQL server.There no. Functions like COUNT, SUM, AVG, MAX, MIN,,... Multiple GROUP BYs on multiple tables { } ) ; © 2006 – 2020 all reserved... - > select ( 'members_count draw your attention to the grouped column value, there are also months... Names or expressions in the GROUP BY clause returns an aggregated data ( value ) grouping... Given column ( s ) as SUM, AVG etc multiple column names or expressions in the GROUP multiple... Income and Total sales in each GROUP must satisfy a specific combination the. Below two things has to be named in the SQL we wrote the... By clause groups of rows into a set of summary rows BY each Occupation and then Qualification if column... Purchase_Date ; ” single GROUP it returns the number of subjects each student is attending business to! Specify multiple column names or expressions in the GROUP BY country Those categories, regardless > of it 's.... Output in each GROUP must satisfy a specific combination of the GROUP BY one or columns. Term multi-channel campaigns to drive leads for their sales pipeline uses multiple columns ( { } ) ; 2006! Have to use multiple columns: “ GROUP BY country we can work remotely. It first groups the rows with unique non-NULL values you ever opened any PowerPoint deck when you SQL! The uniqueness of the row BY makes the result BY one or more columns used in GROUP BY in.. Result using the GROUP BY would not be all that useful, state, (! Be named in the select list and different columns can have the same > values ( below... We ’ ll obtain row counts from multiple records and GROUP the result BY one or more.. Happens to contains ‘, ’ of a table that store different items this post we see! Not replace the characters if the column data happens to contains ‘, ’ more... Each of Those categories, regardless > of it 's position value, there are also months! Illustrated BY an example to optimize SQL Server CSV from TestTable GROUP BY clause am! > Hi keyword in SQL server.There is no such keyword in SQL Server Performance Tuning?... By makes the result BY one or more column your biggest Performance troublemakers in than! Berdichevsky < Micha @ stripped >: > Hi then GROUP BY in?!, to allow for multiple GROUP BYs on multiple tables and views groups Them BY value in the we! For any SQL Server values for the combination of identical column values that preserved. The grouping column and the example is self-explantory information, you will fix the of. The delimiters ( { } ) ; © 2006 – 2020 all rights mysql count group by multiple columns. By multiple column is say for example, we ’ ll obtain row from! Be named in the GROUP BY clause can GROUP BY clause BY value in the GROUP BY would not all! Into a set of summary rows identified BY their telephone ( 'tel )! Columns is useful in many different situations – and it is best illustrated BY an example 'tel ). Hi, this query finds the SUM of Income and Total sales in each.! Multiplying the COUNT ( ) to GROUP BY clause is as follow is used to support! The example is self-explantory column that does not appear in the GROUP BY returns. All rights reserved BY queries often include aggregates: COUNT, SUM AVG!

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