When you do, make sure you state which values of limit_vel_ctera and limit_vel_radar you should consider when you have more than one record with same carretera_foto, pto_km_radar, sentido_radar –Adrian Carneiro Feb We will in the next steps show the SQL to achieve those results, in the different engines. 3. select … where id in (…)213SQL/mysql - Select distinct/UNIQUE but return all columns?0Select Distinct Certain Columns From Result2Select distinct and non-distinct column values0Join two queries from the same table - SELECT Would you like to simply thank Tom for his years of sharing expertise with our community? http://stackoverflow.com/questions/9572131/select-distinct-not-working-as-expected
if all "duplicates" have the same value, is there another column to discriminate them, so we can decide on which one to take? asked 4 years ago viewed 15205 times active 4 years ago Upcoming Events 2016 Community Moderator Election ends in 9 days Related 2Select everything, based on distinct USER ID in Oracle1How This all started when I was told that "for more than one column, unique is always better". The results are sorted in ascending order by city.
Thank you! Watch closely the condition sq.rn = 1 has to be part of the left join condition, and NOT of the where condition! UNION ALL SQL server : http://blog.sqlauthority.com/2009/03/11/sql-server-difference-between-union-vs-union-all-optimal-performance-comparison/ Oracle : http://www.oraclebrains.com/2007/09/sql-tipsuse-union-all-instead-of-union/ MySQL : http://www.mysqlperformanceblog.com/2007/10/05/union-vs-union-all-performance/ 23 Comment Author:Guy Hengel [angelIII / a3] 2 +5 8 Participants Guy Sql Group By Not Working Copyright © 2003-2016 TechOnTheNet.com.
Can anybody advise what type of connector this is? Select Distinct Not Working With Join Try GROUP BY instead - this will let you select the Max, Min, Sum of other fields while still yielding "one row per unique combined values" for fields included in GROUP You'll find here tips, tricks and tutorials about cool things you can do with the Oracle database. © 2015 Oratable. http://stackoverflow.com/questions/34623513/select-distinct-is-not-working Related Posts: Which is faster - IN or EXISTS?
UNION ALL, because UNION used alone implicitly performs a DISTINCT, something that most newcomers in SQL just don't know... Select Distinct Not Working Access AVG, MAX, MIN) share|improve this answer answered Jan 6 at 0:31 dsz 1,4351217 add a comment| up vote 3 down vote Here's my guess at your problem - when you say What is the meaning of "cow in the middle"? http://asktom.oracle.com/pls/asktom/f?p=100:11:::::P11_QUESTION_ID:74320098178823#74401237604050 without using unique and distinct select unique records May 21, 2013 - 6:52 am UTC Reviewer: A reader from India Hi Tom, Hope you are fine.
Giving change in smaller denominations so customers can tip? https://www.experts-exchange.com/articles/3203/DISTINCT-and-GROUP-BY-and-why-does-it-not-work-for-my-query.html Join them; it only takes a minute: Sign up select distinct not working as expected up vote 1 down vote favorite Student group table: STDNT_GROUP studentId,CollegeID,studentgroup,flag 1,007,panthers,y 2,003,owls,n 3,007,owls,y 1,007,texans,y 2,003,texans,n Sql Distinct Not Working With Join Case closed. Select Distinct Not Working Sql Server You might find some subquery in subquery syntax, but honestly: don't try, just use the much easier and still efficient method shown now: -- oracle select sq.* from (
Yes, in older releases - they may well sort, but by default in 10g, they'll hash instead. http://sevevb.com/not-working/distinct-is-not-working-sql.html Taking any given select and changing "distinct" to "unique" seems to give the same explain plan which would support them being synonymous, but the documentation is unclear. Description The Oracle DISTINCT clause is used to remove duplicates from the result set. Equations, Back Color, Alternate Back Color. Distinct Not Working C#
We could use the RANK or DENSE_RANK function also, modifying the ORDER BY argument a little bit: -- oracle select sq.* from ( SELECT t.* , RANK What is the exact requirement? sure you can use a union to get a distinct - but - WHY?????? navigate here I added a link about UNION vs.
How many seconds are a meter in the 4th dimension? Distinct On One Column GO OUT AND VOTE Music notation software for ubuntu How to make a good diagram arrow Teenage daughter refusing to go to school Very small transformer powering a microwave oven Staying Join them; it only takes a minute: Sign up Distinct not working?
Encasing a star in a perfect insulator "president-elect" grammatically correct? For example: SELECT DISTINCT city, state FROM customers WHERE total_orders > 10 ORDER BY city; This Oracle DISTINCT clause example would return each unique city and state combination from the customers Using DISTINCT is simple: just add it after the SELECT keyword, and you don't get duplicates. Distinct Vs Group By Browse other questions tagged sql oracle select distinct or ask your own question.
it would not be smart. Here the example for N = 1: select sq.*, e.Name from tbl_Employee e cross apply ( SELECT TOP 1 * FROM tbl_Employee_WorkRecords t WHERE I think I remember seeing somewhere that distinct was supported prior to 8.1.5 or something like that. his comment is here asked 10 months ago viewed 168 times active 10 months ago Upcoming Events 2016 Community Moderator Election ends in 9 days Related 471How can I SELECT rows with MAX(Column value), DISTINCT
If you want one row for each distinct LOOKUP_VALUE, you either need a WHERE clause that will work out which one of them to show, or an aggregation strategy with a long live. Unless you expect something else of what is a duplicate (and what not) than SQL does actually do. Let's look at it again, more closely: --- MS SQL Server select t.* from tbl_Employee_WorkRecords t where convert(varchar(10), t.work_start_dt, 120) = ( SELECT convert(varchar(10), MAX(i.work_start_dt), 120)
Isn't distinct used to discart the repeated records? –Nausikaa Feb 15 '12 at 18:10 And i need to discart the repeated values and take just one. share|improve this answer answered Oct 22 '12 at 6:12 rics 3,37432136 the data itself only contain date. May 22, 2013 - 5:23 am UTC Reviewer: A reader Hi Tom, I also dont like to use union+dual for selecting unique record. We use advertisements to support this website and fund the development of new content.
I will not discuss the performance of this syntax here; you can check this out for yourself using the execution plans/explain plans and timing the queries. RESPONSABILE Q.C. Wrong way on a bike lane?