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What does SELECT top 1 mean in SQL?

by Rhyley Bryan

What does SELECT top 1 mean in SQL?

SELECT TOP 1 Means Selecting the very 1st record in the result set. SELECT 1 Means return 1 as the result set.

How do I sort by ascending in SQL?

The SQL ORDER BY Keyword The ORDER BY keyword is used to sort the result-set in ascending or descending order. The ORDER BY keyword sorts the records in ascending order by default. To sort the records in descending order, use the DESC keyword.

How do you SELECT top 1 record in each group in SQL?

[dbo]. [InventoryAllocations] ORDER BY ROW_NUMBER() OVER(PARTITION BY DocumentID ORDER BY [RecordTimeStamp] DESC); TOP 1 works with WITH TIES here. WITH TIES means that when ORDER BY = 1 , then SELECT takes this record (because of TOP 1 ) and all others that have ORDER BY = 1 (because of WITH TIES ).

How do I choose ascending order?

To sort in ascending order we have to use ASC in place of DESC. Sort according to multiple columns:In this example we will fetch all data from the table Student and then sort the result in ascending order first according to the column Age. and then in descending order according to the column ROLL_NO.

What is the difference between count (*) and Count 1?

COUNT(*) or COUNT(1) The difference is simple: COUNT(*) counts the number of rows produced by the query, whereas COUNT(1) counts the number of 1 values. This is because the database can often count rows by accessing an index, which is much faster than accessing a table.

How do you select top 5 salary in SQL?

Solution 13

  1. SELECT MAX(salary) FROM employee;
  2. SELECT MAX(slary), dept_id from employee group by dept_id;
  3. select distinct salary from employee order by salary desc limit 5;
  4. select distinct salary, dept_id from employee order by salary desc limit 5;

What is the correct format to SELECT Emp_name in ascending order?

Explanation: Sorting in ascending or descending order depends on keyword “DESC” and “ASC”. 4. What will be the order of sorting in the following MySQL statement? Explanation: In the query, first “emp_id” will be sorted then emp_name with respect to emp_id.

What is the order of clauses in SQL?

In SQL ORDER BY clause, we need to define ascending or descending order in which result needs to be sorted. By default, SQL Server sorts out results using ORDER BY clause in ascending order. Specifying ASC in order by clause is optional.

Which row does group by return?

The GROUP BY clause returns one row for each group. In other words, it reduces the number of rows in the result set.

How do I get the top 1 record in SQL?

SQL TOP, LIMIT, FETCH FIRST or ROWNUM Clause

  1. SQL Server / MS Access Syntax: SELECT TOP number|percent column_name(s) FROM table_name.
  2. MySQL Syntax: SELECT column_name(s) FROM table_name.
  3. Oracle 12 Syntax: SELECT column_name(s)
  4. Older Oracle Syntax: SELECT column_name(s)
  5. Older Oracle Syntax (with ORDER BY): SELECT *

What is the default sort order of ORDER BY clause?

Ascending is the default sort order in an ORDER BY clause.

Which is faster count 1 or count (*)?

According to this theory COUNT(*) takes all columns to count rows and COUNT(1) counts using the first column: Primary Key. Thanks to that COUNT(1) is able to use index to count rows and it’s much faster.

Which is an example of order by ascending in SQL?

Introduction to SQL ORDER BY Ascending 1 Evaluation. The ORDER BY clause in SQL is evaluated after the FROM, WHERE, SELECT, HAVING, GROUP BY, and clauses. 2 Examples of SQL ORDER BY Ascending. Now, let us simply order the records of the developer’s table based on the technology column value. 3 Conclusion.

How does select top work when no order by is specified?

SELECT TOP(N) ….. ORDER BY [COLUMN] We get top (n) rows that are sorted by column ( asc or desc depending on what we choose) But if we don’t specify any order by, msdn says random as Gail Erickson pointed out here. As he points out it should be unspecified rather then random. But as Thomas Lee points out there that

How to sort rows in ascending order in PostgreSQL?

Second, you use the ASC option to sort rows in ascending order and the DESC option to sort rows in descending order. If you omit the ASC or DESC option, the ORDER BY uses ASC by default. PostgreSQL evaluates the clauses in the SELECT statment in the following order: FROM, SELECT, and ORDER BY:

How to display a list in ascending order in MySQL?

An error occurred while retrieving sharing information. Please try again later. We can apply this to our numeric field mark to display the list in order of lowest mark to highest mark by using the ASC command ( ascending command ) . Please note that by default all order by commands are in ascending order only.