Question

I have a table in which each hundret rows have the same id (see “chart_id” in shortened Example below).

If we consider every row with the same “chart_id” a “chart” how do I select every chart having a certain year in it with a mysql query.

For example how do I select every chart with 2009 in it (chart2 and chart3):

edit:
rows with id 4,5,6 and 7,8,9 should be selected if I look for 2009.

id   chart_id  time
1    1         2008
2    1         2008
3    1         2008

4    2         2008
5    2         2008
6    2         2009

7    3         2009
8    3         2009
9    3         2009

10   4         2010
11   4         2010
12   4         2010

Any suggestions?

Thanks 🙂

Answer 1

Just use DISTINCT:

SELECT DISTINCT chart_id
FROM myTable
WHERE time = 2009

Or, do you mean you want all the rows for that chart SQL Fiddle:

SELECT *
FROM myTable t1
WHERE EXISTS(SELECT 1 
             FROM myTable t2 
             WHERE t2.chart_id = t1.chart_id AND t2.time = 2009)