SQL- query which finds the name of a specific row which has max linked columns from another table
get other columns that correspond with max value of one column
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mysql> select max and corresponding row
There are 2 tables:
users: id, name albums: id, user_id
I need a SQL query which finds the NAME of the user who has the max count of albums. How do I do that?
Here is what I have tried so far -
SELECT Users.name FROM Users JOIN Albums ON Users.id = Albums.user_id HAVING COUNT(Albums.id) = MAX(COUNT(Albums.id));
(this doesnt work)
This sub query should return the name of the user having maximum number of albums.
SELECT name FROM Users WHERE id = (SELECT user_id FROM Albums GROUP BY user_id ORDER BY COUNT(*) DESC LIMIT 1);
Here is the GROUP BY used to group the user_id with the COUNT of each user_id occurrences otherwise return the count for all records in the table.
If there multiple max occurrences with same count then you have to use IN keyword for the query to return all names and the query will be bit complex.
Find MAX value from multiple columns in a SQL Server table, Our task is to find the last update date for each row using the three dates and we will provide four solutions for this task. By looking at the above� Select Rows with Maximum Value on a Column Example 2. In this example, we will show how to select rows with max value along with remaining columns. It is useful if you want to return the remaining columns (non-group by columns). For this SQL Server example, we used the Inner Join to join the employee table with itself.
You could use a limit 1
select Users.name, count(distinct Albums.id) max_count from Users INNER JOIN Albums on Users.id = Albums.user_id GROUP BY Users.name ORDER max_count desc limit 1
or a filter the having beas on max for max count
select Users.name from Users INNER JOIN Albums on Users.id = Albums.user_id GROUP BY Users.name HAVING count(distinct Albums.id) = ( select max(t.max_count) from ( select Users.name, count(distinct Albums.id) max_count from Users INNER JOIN Albums on Users.id = Albums.user_id GROUP BY Users.name ) t )
SQL: MAX Function, This SQL tutorial explains how to use the SQL MAX function with syntax and examples. The SQL MAX function is used to return the maximum value of an expression in a I just want to know who ran a particular report the last time it was run. I have a table in Oracle called orders which has the following fields: order_no,� For this tip, let's begin by creating a table and inserting some example rows. The CREATE TABLE statement below has a primary key column, integer columns for the YearMonth, Year and Month, the recorded value for which we are finding the min and max, and then a couple of attribute columns whose data values we need to report.
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4. Query Performance Optimization, We show you how to find out how MySQL executes a particular query, Find out whether the MySQL server is analyzing more rows than it Another way to slice up a query is to divide and conquer, keeping it For example, it checks that tables and columns exist, and it resolves names and aliases to ensure� Summary: in this tutorial, you will learn how to use the SQL COUNT function to get the number of rows in a specified table. Introduction to SQL COUNT function. The COUNT() function returns the number of rows in a group. The first form of the COUNT()function is as follows:
- 2nd option seem not very optimal to me
- In mysql there is limit so is possible reduce the result only at a row ..but in pure sql (not using limit or db dependen row limitation) the second work for all sql standard db
- I see.But still, I suspect that other DBs have other ways to optimize such type of query