general questions about joins in queries

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От Zlatko Matić
Тема general questions about joins in queries
Дата
Msg-id 000001c61b55$4eec0aa0$52bffea9@zlatkovyfkpgz6
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Ответы Re: general questions about joins in queries
Список pgsql-general
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Hello.
Is it better to use A) or B) ?
 
A)
 
SELECT
 "public"."departments".*,
 "public"."plants".*,
 "public"."batches_microbs".*,
 "public"."results_microbs".*
FROM
 "public"."departments",
 "public"."plants",
 "public"."batches_microbs",
 "public"."results_microbs"
WHERE
 "plants"."department" = "departments"."department" AND
 "batches_microbs"."plant" = "plants"."plant" AND
 "results_microbs"."batch" = "batches_microbs"."batch"
 
B)
 
SELECT
 "public"."departments".*,
 "public"."plants".*,
 "public"."batches_microbs".*,
 "public"."results_microbs".*
FROM
public.departments
  INNER JOIN public.plants ON (public.departments.department = public.plants.department)
  INNER JOIN public.batches_microbs ON (public.plants.plant = public.batches_microbs.plant)
  INNER JOIN public.results_microbs ON (public.batches_microbs.batch = public.results_microbs.batch)
 

Thanks,
 
Zlatko

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