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How to select data for a unique column ?
Hi all,
I have a table with the following data.
name manager
------- -----------
Pankaj Suneel
Gaurav Suneel
Pankaj Ahmed
Sangeetha Ahmed
Gaurav Ahmed
For each unique name, I want to get any one row from the table. I mean to say, since there are 3 unique names (Pankaj, Gaurav, Sangeetha), I want any rows for them. The sample output would be
Pankaj Suneel (Or Pankaj Ahmed will also do)
Gaurav Suneel (Or Gaurav Ahmed will also do)
Sangeetha Ahmed (Because there is a single row).
I am confused. Please help me.
Thanks.
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Answers
All tables, by definition, have a primary key. If you have not explicitly defined one, then the key is every column in the table. That may or may not be desirable in this case (from the sample of data you provided it sounds reasonable). You may want to make sure it is explicitly declared as such so the DBMS will at least know what you're doing.
In any case, SELECT MIN(manager) FROM the_table GROUP BY name
... is just as good as anything. Pick your favorite aggregation function and run with it, basically, since you don't care which row gets returned.
VoteyDisciple, can u explain if ur query does exactly wat is required ? Please correct me if im wrong, but this is wat i believe vil happen : -
>> SELECT MIN(manager) FROM the_table GROUP BY name --- selects a single manager for every name.
>> SELECT name, manager FROM the_table WHERE manager IN (SELECT MIN(manager) FROM the_table GROUP BY name) --- selects name, manager from the_table having manager in the the above list i.e. select name, manager from the_table where manager is in the list of a manager for every name, NOT that specific one. This query night return multiple records for the same name, which is not desired. I suppose u missed and a WHERE condition.
I guess the below query wud the requried : -
SELECT name, (SELECT MIN(manager) FROM the_table WHERE name = t.name)
FROM the_table t
GROUP BY name
Yeah, I didn't properly think that through after revising what the primary key is. You're right; my query will just select... well, nothing of particular value -- all the names associated with a bunch of managers selected by no thought-out criterion.
jinesh_kamdar's solution is more appropriate in this schema -- select the name, and the minimum manager for that name.
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by: ivanovnPosted on 2006-11-06 at 10:31:56ID: 17883153
SELECT name, manager
FROM table1
WHERE name IN (SELECT DISTINCT name FROM table1)