Does distinct have to be first?

Does distinct have to be first?

Because the DISTINCT keyword applies to the entire result set, and not just one column, the DISTINCT must go at the start of the query, just after SELECT: SELECT DISTINCT col1, col2, col3 FROM tableā€¦

Can distinct be used with order by?

There is no way this query can be executed reasonably. Either DISTINCT doesn’t work (because the added extended sort key column changes its semantics), or ORDER BY doesn’t work (because after DISTINCT we can no longer access the extended sort key column).

Does select distinct order?

ORDER BY items must appear in the select list if SELECT DISTINCT is specified. This message pops up when you ask for DISTINCT rows for one set of columns, but you’d like to have the results ordered by one or more columns not specified in your distinct set.

How use distinct and order by together in SQL?

If we add the DISTINCT operation, it would be added between SELECT and ORDER BY :

  1. FROM MonitoringJob.
  2. SELECT Category, CreationDate.
  4. ORDER BY CreationDate DESC.
  5. SELECT Category.

What is distinct value?

The SELECT DISTINCT statement is used to return only distinct (different) values. Inside a table, a column often contains many duplicate values; and sometimes you only want to list the different (distinct) values.

How does SQL order by work?

The ORDER BY statement in sql is used to sort the fetched data in either ascending or descending according to one or more columns.

  1. By default ORDER BY sorts the data in ascending order.
  2. We can use the keyword DESC to sort the data in descending order and the keyword ASC to sort in ascending order.

What does order by 1 do in SQL?

SQL Server allows you to sort the result set based on the ordinal positions of columns that appear in the select list. In this example, 1 means the first_name column and 2 means the last_name column.

How many tables can you join?

The join operation is used to combine related rows from two tables into a result set. Join is a binary operation. More than two tables can be combined using multiple join operations. Understanding the join function is fundamental to understanding relational databases, which are made up of many tables.

What is the difference between Equijoin and non equi join?

An equijoin is a join with a join condition containing an equality operator. An equijoin returns only the rows that have equivalent values for the specified columns. An inner join is a join of two or more tables that returns only those rows (compared using a comparison operator) that satisfy the join condition.

How do you write an inner join in SQL?


  1. SELECT column_name(s) FROM table1. INNER JOIN table2. ON table1.column_name = table2.column_name;
  2. Example. SELECT Orders.OrderID, Customers.CustomerName. FROM Orders. INNER JOIN Customers ON Orders.CustomerID = Customers.CustomerID;
  3. Example. SELECT Orders.OrderID, Customers.CustomerName, Shippers.ShipperName. FROM ((Orders.

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