How is the distinct top SELECTED?
To do this, select Query -> Include Actual Query Plan from the menu before running the query. The “Stream Aggregate” icon is for the DISTINCT operation and “Top” for the TOP 10 operation. It may seem counterintuitive to see DISTINCT first within the SELECT statement.
Table of Contents
How do you SELECT the top 2 values in SQL?
Select TOP 2 * of Products where Price = (Select Max(Price) of Products);
How do I SELECT the top 10 in SQL?
Example: Using the TOP PERCENT keyword SELECT TOP(10) PERCENT employee_id, last_name, first_name FROM employee WHERE last_name = ‘Anderson’ ORDER BY employee_id; This SQL Server SELECT TOP example would select the first 10% of the records from the entire result set.
Can we use different with top?
It works simply if you use a query like this: SELECT DISTINCT TOP 2 name FROM [ATTENDANCE]; In the above query, name is column_name and [ATTENDANCE] is table_name. You can also use WHERE with this to create filter conditions.
How do you select distinct values in an Access query?
Answer: Open your query in design view. Right-click somewhere in the Query window next to a table (but not a table) and select Properties from the popup menu. Set the “Unique Values” property to Yes.
How to use distinct and superior?
SELECT ABOVE (5) contact_id, last_name, first_name FROM contacts WHERE last_name = ‘Anderson’ ORDER BY contact_id; This SQL SELECT TOP example would select the first 5 records from the contacts table where the last name is ‘Anderson’.
How to select records based on ID list?
You can use Contains() for that. It’ll feel a bit backwards when you’re actually trying to produce an IN clause, but this should work: I’m also assuming that each user profile record will have an int id field.
How to select from the table where the id is?
SELECT * FROM TABLE WHERE ID = id1 OR ID = id2 OR ID = idn I think this approach has no limit of n, but what about performance if n is very large?
For example: SELECT TOP(5) contact_id, last_name, first_name FROM contacts WHERE last_name = ‘Anderson’ ORDER BY contact_id; This SQL SELECT TOP example would select the first 5 records from the contacts table where the last name is ‘Anderson’.
How to SELECT unique records from a table?
The SQL SELECT DISTINCT statement The SELECT DISTINCT statement is used to return only distinct (distinct) values. Within a table, a column often contains many duplicate values; and sometimes you just want to list the different (distinct) values.
How to get the top 1 from a SELECT DISTINCT?
If you have duplicate values, they will appear one after another based on the order by clause, so you will only complicate the query by using different ones. A simple top 1/ORDER BY should work fine. Here is a sample of what I am talking about.
Can you use distinct and order by in the same SELECT statement?
But now, with the extended sort key column CreationDate, the semantics of the DISTINCT operation have changed, so the result will no longer be the same. This is not what we want, so both the SQL standard and all reasonable databases prohibit this use. I’ve blogged about SQL DISTINCT and ORDER BY in more detail here.
What is an example of a distinct query?
The query example: ORDER BY elements must appear in the select list if SELECT DISTINCT is specified. Because of this, you should be aware, when using ORDER BY, that ORDER BY elements must appear in the select list when using Distinct. Good post with great examples. Thanks for write
How to SELECT DISTINCT values in SQL table?
The following SQL statement selects ALL values (including duplicates) from the “Country” column in the “Customers” table: Now, let’s use the DISTINCT keyword with the above SELECT statement and see the result. The following SQL statement selects only DISTINCT values from the “Country” column in the “Customers” table:
How to select the top 1 based on a distinct value?
For example, if I have data like this, I want to extract only BOLD data. You can also get the distinct values of column C first, then use CROSS APPLY to get TOP(1) for each row in the first derived result.
When to use distinct and top at the same time?
If you want to use a true DISTINCT, just list the column you want to receive distinct values from. If you have multiple columns, all those columns combined form a separate record. Note that without an ORDER BY this will return the first 10 records in no particular order. The results may be different each time you run the query.
Can a flag be added to a SELECT statement?
Once you add columns to the SELECT statement, they come under the influence of the DISTINCT operator. I say direct, since you could get a different list and then use an INNER JOIN to extract other columns. However, there are dangers in doing that, as the join can reintroduce duplicates. Adding a TOP clause to DISTINCT is interesting.