检查PostgreSQL中是否存在索引

Question

我知道如何创建索引

CREATE INDEX ix_dsvtable
  ON public."DsVTable"
  USING btree
  (dind, sec, regind, datind);

如何检查索引是否已存在？

如果它们还不存在,我需要检查它们的存在并创建它们.

Answer 1

您可以使用以下查询获取索引列表,其表和列:

select
    t.relname as table_name,
    i.relname as index_name,
    a.attname as column_name
from
    pg_class t,
    pg_class i,
    pg_index ix,
    pg_attribute a
where
    t.oid = ix.indrelid
    and i.oid = ix.indexrelid
    and a.attrelid = t.oid
    and a.attnum = ANY(ix.indkey)
    and t.relkind = 'r'
   -- and t.relname like 'mytable'
order by
    t.relname,
    i.relname;

从那里,您可以通过索引名称或涉及的列检查存在,并决定创建/跳过索引.