RE:Re: RE:Re: A complex SQL query

Hello Vicor!

It works!!!

Thank you very much.

--From: vyegorov(at)gmail(dot)com
--To: jj08(at)drivehq(dot)com
--CC: pgsql-sql(at)lists(dot)postgresql(dot)org
--Date: 9/7/2019 2:33:40 PM --Subject: Re: RE:Re: A complex SQL query сб, 7 сент. 2019 г. в 21:23, jj08 <<a href="mailto:jj08(at)drivehq(dot)com">jj08(at)drivehq(dot)com>:

To Janis or other members of the forum:

My sample table contains other columns as well.

One of the columns that I did not include in my first message is &quot;position&quot;.
The last table has been modified as follows:

+--------+----------+------------+------------------------+
| usr_id | employer | position + start_date | end_date |
+--------+----------+------------+------------------------+
| A | Goo | CTO | | 201904 |
| A | Micro | Mgr | 201704 | 201903 |

| B | Micro | Engg_Mgr | 201706 | - |
| B | Goo | Researcher | 201012 | 201705 |
| B | Micro | Postdoc | 201001 | 201011 | +--------+----------+------------+------------------------+
SELECT DISTINCT ON (usr_id)
*
FROM employment
WHERE employer='Micro' ORDER BY usr_id, start_date DESC;
-- Victor Yegorov

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