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You're using a SELECT * which is pulling in all records. If you want to use a true DISTINCT only list out the column you want to receive distinct values of. If you have multiple columns then all those columns combined make up one distinct record. SELECT distinct TOP 10 personID.
4 lis 2012 · I have the following query I want to fire: SELECT DISTINCT TOP(5) fp.PostId FROM dbForumPosts fp LEFT JOIN dbForumEntry fe ON fp.PostId = fe.PostId Order by fe.Datemade DESC However, when I fire ...
This paper explores the PROC SQL, SAS version of SQL, from clinical data validation perspective. In particular this paper provides a comprehensive and cohesive overview of the PROC SQL features in the form of examples, which can be effectively used in the process of building a best tool for clinical data validation.
13 mar 2024 · By mastering advanced SQL techniques, healthcare IT professionals can unlock the full potential of their data, driving improvements in care quality, operational efficiency, and patient...
PostgreSQL has a special non-standard DISTINCT ON operator that can also be used. The optional ORDER BY is for selecting which row from every group should be selected: SELECT DISTINCT ON (key) key, value FROM tableX -- ORDER BY key, <some_other_expressions> ;
15 maj 2015 · SQL DISTINCT and TOP – Which is First? Let’s look at the first statement who purpose is to return a unique list of fist and last names. SELECT DISTINCT TOP 10 FirstName, LastName . FROM Person.Person. ORDER BY LastName; . TOP 10 will return the first ten items from the ordered set, and SQL DISTINCT will remove any duplicates.
The DISTINCT clause is used in the SELECT statement to filter out duplicate rows in the result set. You can use DISTINCT when you select a single column, or when you select multiple columns as we did in our example.
