tuichenchuxin commented on issue #13571:
URL:
https://github.com/apache/shardingsphere/issues/13571#issuecomment-966949244
in postgres
```
SELECT COUNT(*)
FROM pg_class c
LEFT JOIN pg_namespace n ON n.oid = c.relnamespace
WHERE c.relkind = ANY ('{r,v,m}'::char[])
UNION
SELECT COUNT(*)
FROM pg_attribute a
JOIN pg_class c on a.attrelid = c.oid
JOIN pg_namespace n on c.relnamespace = n.oid
JOIN pg_type tp on tp.typelem = a.atttypid
WHERE a.attnum > 0
UNION
SELECT COUNT(*)
FROM information_schema.routines;
```
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