Re: [PERFORM] EXISTS optimization

>>> On Fri, Mar 23, 2007 at 5:26 PM, in message
<46040DAC(dot)EE98(dot)0025(dot)0(at)wicourts(dot)gov>, "Kevin Grittner"
<Kevin(dot)Grittner(at)wicourts(dot)gov> wrote:

> I tried something which seems
> equivalent, but it is running for a very long time. I'll show it with just
> the explain while I wait to see how long the explain analyze takes.
>
> explain
> SELECT "A"."adjustmentNo", "A"."tranNo", "A"."countyNo", "H"."date",
> "H"."userId", "H"."time"
> FROM "Adjustment" "A"
> JOIN "TranHeader" "H" ON ("H"."tranId" = "A"."adjustmentNo" AND
> "H"."countyNo" = "A"."countyNo" AND "H"."tranNo" = "A"."tranNo")
> WHERE "H"."tranType" = 'A'
> AND "A"."date" > DATE '2006- 01- 01'
> AND "H"."countyNo" = 66
> AND "A"."countyNo" = 66
> AND "H"."tranNo" IN
> (
> SELECT "D"."tranNo" FROM "TranDetail" "D"
> WHERE "D"."caseNo" LIKE '2006TR%'
> AND "D"."countyNo" = "H"."countyNo"
> )
> ;

explain analyze results:

Nested Loop (cost=0.00..181673.08 rows=1 width=46) (actual time=42224.077..964266.969 rows=2209 loops=1)
Join Filter: (("H"."tranId")::bpchar = ("A"."adjustmentNo")::bpchar)
-> Seq Scan on "Adjustment" "A" (cost=0.00..2384.27 rows=11733 width=22) (actual time=15.355..146.620 rows=13003 loops=1)
Filter: (((date)::date > '2006-01-01'::date) AND (("countyNo")::smallint = 66))
-> Index Scan using "TranHeader_pkey" on "TranHeader" "H" (cost=0.00..15.27 rows=1 width=46) (actual time=74.141..74.141 rows=0 loops=13003)
Index Cond: ((("H"."tranNo")::integer = ("A"."tranNo")::integer) AND (("H"."countyNo")::smallint = 66))
Filter: ((("tranType")::bpchar = 'A'::bpchar) AND (subplan))
SubPlan
-> Index Scan using "TranDetail_TranDetCaseNo" on "TranDetail" "D" (cost=0.00..27.66 rows=20 width=4) (actual time=0.039..58.234 rows=42342 loops=13003)
Index Cond: ((("caseNo")::bpchar >= '2006TR'::bpchar) AND (("caseNo")::bpchar < '2006TS'::bpchar) AND (("countyNo")::smallint = ($0)::smallint))
Filter: (("caseNo")::bpchar ~~ '2006TR%'::text)
Total runtime: 964269.555 ms