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All empty tables in a Postgresql database
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| drop FUNCTION empty_tables; | |
| CREATE OR REPLACE FUNCTION empty_tables() | |
| RETURNS TABLE(name text) AS | |
| $BODY$ | |
| DECLARE | |
| t record; | |
| v_sql text; | |
| hasdata bool; | |
| BEGIN | |
| DROP TABLE IF EXISTS tmp_emptytables; | |
| CREATE TEMP TABLE tmp_emptytables (name text); | |
| FOR t in (SELECT table_schema, table_name | |
| FROM INFORMATION_SCHEMA.tables | |
| WHERE table_schema NOT IN('information_schema','pg_catalog') | |
| AND table_name <> 'tmp_emptytables') | |
| LOOP | |
| v_sql := 'SELECT true as hasdata FROM '||quote_ident(t.table_schema)||'.'||quote_ident(t.table_name)||' LIMIT 1'; | |
| --RAISE INFO 'v_sql:%',v_sql; | |
| EXECUTE v_sql INTO hasdata; | |
| IF hasdata IS NULL THEN | |
| insert into tmp_emptytables SELECT quote_ident(t.table_schema)||'.'||quote_ident(t.table_name); | |
| END IF; | |
| END LOOP; | |
| RETURN QUERY (SELECT * FROM tmp_emptytables ORDER BY 1); | |
| END | |
| $BODY$ | |
| LANGUAGE plpgsql VOLATILE | |
| COST 100; | |
| select * from empty_tables(); | |
| /* --or just this query: | |
| SELECT nspname || '.' || relname AS "relation" | |
| FROM pg_class C LEFT JOIN pg_namespace N ON (N.oid = C.relnamespace) | |
| WHERE nspname NOT IN ('pg_catalog', 'information_schema','pg_toast') AND pg_relation_size(C.oid)=0 | |
| ORDER BY 1; | |
| */ |
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