database - How to select unique records by SQL - Stack Overflow
just use inner join because group by won't work with multiple columns saying not contained in either an aggregate function. SELECT a.* FROM yourtable a INNER JOIN (SELECT …
sql - DISTINCT clause with WHERE - Stack Overflow
May 29, 2017 · How can I use the DISTINCT clause with WHERE? For example: SELECT * FROM table WHERE DISTINCT email; -- email is a column name I want to select all columns …
How to use the UNIQUE Operator SQL - Stack Overflow
Jan 28, 2014 · SELECT UNIQUE is old syntax supported by Oracle's flavor of SQL. It is synonymous with SELECT DISTINCT. It is synonymous with SELECT DISTINCT. Use …
Difference between Select Unique and Select Distinct
Oct 27, 2014 · In SQL, the UNIQUE keyword prevents two records in a column from having the same values, while the DISTINCT keyword removes duplicate values when retrieving data. …
sql - How to use DISTINCT and ORDER BY in same SELECT …
Since I was wondering if maybe I was wrong somehow, I also loaded the example database in your blog post to double-check: the DISTINCT ON query you gave there produced a total of …
When is it proper to use unique key in a table than a primary key?
Mar 7, 2012 · A UNIQUE constraint is similar to PRIMARY key, but you can have more than one UNIQUE constraint per table. When you declare a UNIQUE constraint, SQL Server creates a …
Using DISTINCT along with GROUP BY in SQL Server
Perhaps not in the context that you have it, but you could use. SELECT DISTINCT col1, PERCENTILE_CONT(col2) WITHIN GROUP (ORDER BY col2) OVER (PARTITION BY col1), …
SQL Server - INNER JOIN WITH DISTINCT - Stack Overflow
Aug 15, 2023 · You can use CTE to get the distinct values of the second table, and then join that with the first table. You also need to get the distinct values based on LastName column. You …
sql - Should I use a unique constraint in a table even though it …
Apr 11, 2012 · using a unique constraint on a column even though you don't really need it to be unique. the answer is no, don't use it. there are time and space downsides. Your sample table …
sql - DISTINCT for only one column - Stack Overflow
Feb 19, 2017 · This assumes SQL Server 2005+ and your definition of "last" is the max PK for a given email WITH CTE AS ( SELECT ID, Email, ProductName, ProductModel, …