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2. database - How to select unique records by SQL - Stack Overflow

   stackoverflow.com/questions/1641718

   DISTINCT keyword is supposed to be applied to all the columns in the select query and not just to the column next to which DISTINCT keyword is written. So, basically, it means that every row returned in the result will be unique in terms of the combination of the select query columns. In OP's question, the below two result rows are already ...

3. sql - DISTINCT clause with WHERE - Stack Overflow

   stackoverflow.com/questions/5610528

   SQL select Distinct with where clause. 2. Using Distinct as a parameter. 1. SQL: distinct in where clause ...

4. How do I (or can I) SELECT DISTINCT on multiple columns?

   stackoverflow.com/questions/54418

   11. If your DBMS doesn't support distinct with multiple columns like this: select distinct(col1, col2) from table. Multi select in general can be executed safely as follows: select distinct * from (select col1, col2 from table ) as x. As this can work on most of the DBMS and this is expected to be faster than group by solution as you are ...

5. Using DISTINCT along with GROUP BY in SQL Server

   stackoverflow.com/questions/32702310

   Use DISTINCT to remove duplicate GROUPING SETS from the GROUP BY clause. In a completely silly example using GROUPING SETS() in general (or the special grouping sets ROLLUP() or CUBE() in particular), you could use DISTINCT in order to remove the duplicate values produced by the grouping sets again: SELECT DISTINCT actors.

6. sql - Selecting COUNT (*) with DISTINCT - Stack Overflow

   stackoverflow.com/questions/1521605

   Count(DISTINCT program_name) AS [Count], FROM cm_production. WHERE push_number = @push_number. GROUP BY program_type. DISTINCT COUNT(*) will return a row for each unique count. What you want is COUNT(DISTINCT <expression>): evaluates expression for each row in a group and returns the number of unique, non-null values.

7. sql - DISTINCT for only one column - Stack Overflow

   stackoverflow.com/questions/5021693

   SQL: Select Distinct on 1 column. 0. SQL distinct on 2 columns. 3. Selecting specific distinct column in ...

8. sql - How to use DISTINCT and ORDER BY in same SELECT statement...

   stackoverflow.com/questions/5391564

   To do this, you need to use an aggregate function to sort on, and use a GROUP BY to make the DISTINCT work. Try something like this: SELECT DISTINCT Category, MAX(CreationDate) FROM MonitoringJob. GROUP BY Category. ORDER BY MAX(CreationDate) DESC, Category. edited Dec 28, 2017 at 15:48.

9. sql - Using DISTINCT and TOP in the same query - Stack Overflow

   stackoverflow.com/questions/15479224

   13. It works simply if you use query like this: SELECT DISTINCT TOP 2 name FROM [ATTENDANCE] ; In the above query, name is the column_name and [ATTENDANCE] is the table_name. You can also use WHERE with this to make filtering conditions. edited Jun 15, 2017 at 22:23. SQL Police. 4,187 1 27 57.

10. sql - Which is better: Distinct or Group By - Stack Overflow

    stackoverflow.com/questions/374973

    0. In MySQL, DISTINCT seems a bit faster than GROUP BY if theField is not indexed. DISTINCT only eliminate duplicate rows but GROUP BY seems to sort them in addition. answered Feb 14, 2017 at 16:01. auntyellow. 2,563 3 29 51.

11. MySQL: Select DISTINCT / UNIQUE, but return all columns?

    stackoverflow.com/questions/6127338

    SELECT DISTINCT FIELD1, FIELD2, FIELD3 FROM TABLE1 works if the values of all three columns are unique in the table. If, for example, you have multiple identical values for first name, but the last name and other information in the selected columns is different, the record will be included in the result set.