'case column' in HAVING clause

[Philia]

Hello,

I'm having problem migrating to postgreSQL from MySQL, some of my queries does not work in postgres.

Query(simplified):

SELECT t1.bus_stop, t1.time,
(case when t1.time >2200 then t1.time + 10000 else t1.time END) AS sort_column
FROM routes AS t1
GROUP BY  t1.bus_stop, t1.time
HAVING sort_column > 2200 ORDER BY sort_column  LIMIT 1

Error:

ERROR:  column "sort_column" does not exist

How to use a 'case column' in HAVING clause?

[rski]

Maybe like this

SELECT i,j, sort_kolumn from (
SELECT t1.bus_stop as i, t1.time as j,
(case when t1.time >2200 then t1.time + 10000 else t1.time END) AS sort_column FROM routes AS t1) foo
GROUP BY  i,j
HAVING sort_column > 2200 ORDER BY sort_column  LIMIT 1

Does it work?

[Philia]

Maybe like this

SELECT i,j, sort_kolumn from (
SELECT t1.bus_stop as i, t1.time as j,
(case when t1.time >2200 then t1.time + 10000 else t1.time END) AS sort_column FROM routes AS t1) foo
GROUP BY  i,j
HAVING sort_column > 2200 ORDER BY sort_column  LIMIT 1

Does it work?

Yes, it works. Thank you rski. :)
But for me it looks like way around the problem, is there a better way to do this?
I'm migrating to postgres to speed up my aplication so I'm concerned about the speed of this query.

[rski]

If i'm right HAVING clause can't have CASE clause.
Say what do you want to achieve and what is table structure, maybe there is another solution than yours.