>
>
>>
> Dependendo da versão do PostgreSQL, se você fizer um EXPLAIN ANALYZE de
> cada uma delas, provavelmente o plano será exatamente o mesmo.
>
Utilizo a versão 9.3.x
executei o EXPLAIN..
SELECT twe.*
, (SELECT descricao FROM tespecializacoes WHERE idespecializacao =
twe.idespecializacao) AS especializacao
FROM tworkflowetapas twe
"Seq Scan on tworkflowetapas twe (cost=0.00..16.36 rows=14 width=30)
(actual time=0.040..0.142 rows=14 loops=1)"
" SubPlan 1"
" -> Seq Scan on tespecializacoes (cost=0.00..1.09 rows=1 width=218)
(actual time=0.003..0.004 rows=1 loops=14)"
" Filter: (idespecializacao = twe.idespecializacao)"
" Rows Removed by Filter: 7"
"Total runtime: 0.220 ms"
SELECT twe.*
FROM tworkflowetapas twe
LEFT JOIN tespecializacoes esp ON (twe.idespecializacao =
esp.idespecializacao)
"Seq Scan on tworkflowetapas twe (cost=0.00..1.14 rows=14 width=30)
(actual time=0.013..0.016 rows=14 loops=1)"
"Total runtime: 0.068 ms"
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