Mysql select top 10

Returning a large number of records can impact performance. MySQL: Select top n max values? I have an big problem with an SQL Statement in Oracle. How can i make a query to get only the top ? Write a query to select first records from a table. I would like to retrieve the top value of result set of query which is connected using Union.

Its syntax is described in Section 13. SELECT supports explicit partition selection using the PARTITION with a list of partitions or subpartitions (or both) following the name of the table in a table_reference (see Section 1. 1 “JOIN Syntax ”). In this case, rows are selected only from the partitions listed.

O Best I can think of on the spur of the moment, sir. In this tutorial you will learn how to retrieve fixed number of records from the table. In some situations, you may not be interested in all of the rows returned by a query, for example, if you just want to retrieve the top employees who recently joined the organization, get top students by score, or something like that. We can remedy the above issue by first selecting the largest cities, without regards to country, and limit those to the top N rows. The outer SELECT then sorts by country_code and population (in descending order).

You would change it to any number as you need. Non SQL Server databases use keywords like LIMIT, OFFSET, and ROWNUM. SELECT TOP is useful when working with very large datasets. This SQL-Statement is not supported in the WebSQL Database.

The example still works, because it uses a modified version of SQL. You want records from each category as per your title. I assumed a category is the same as CellID. So, when a client connects to or opens a mysql command prompt, a database (from existing multiple databases) should be selected to run the SQL queries or operations. Stack Exchange Network Stack Exchange network consists of 1QA communities including Stack Overflow , the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

For example, what if I wanted to retrieve the first records from my query. The LIMIT clause is used in the SELECT statement to constrain the number of rows to return. If you’re wondering which happens first, the DISTINCT or TOP operations, then compare the from the last two queries. Notice that the query “DISTINCT TOP ” includes the first rows from the query from the “DISTINCT” query. From this we know a DISTINCT list is first create and then the TOP items returned.

I have a table that logs a record containing a useri a fileid and a date, one record inserted every time that file is downloaded. I want to get the top downloads by count for a given date range. I need top -ten records from a table sorted in some way, i. SQL syntax of the database you are familiar with.

The other of the result set would not be returned by the SELECT statement. Based on a similar concept, combined with string walking, I now present a query which selects top -n records for each group, ordered by some condition. How to get Top N rows from Oracle by using SQL To get top N records from Oracle is tricky and there are basically three different ways (based on the Oracle versions) to get them by using Oracle SQL.

Below we use the Products table in Oracle Northwind datatbase to demonstrate how to get top most expensive products.