Query goal: | Find derived tables (views and materialized views) that use a set theoretic operation (union, except or intersect) in a manner that does not remove duplicate rows and thus can produce a multiset not a set. Make sure that it is what is needed. |
Notes about the query: | In the returned subquery of view/materialized view the query replaces each newline character with the line break (br) tag for the better readability in case the query result is displayed in a web browser. |
Query type: | General (Overview of some aspect of the database.) |
Query license: | MIT License |
Data source: | INFORMATION_SCHEMA+system catalog |
SQL query: | Click on query to copy it
SELECT table_schema, table_name, type, regexp_replace(view_definition,'[\r\n]','<br>','g') AS view_definition FROM (SELECT views.table_schema, views.table_name, 'VIEW' AS type, views.view_definition FROM information_schema.views WHERE table_schema NOT IN (SELECT schema_name FROM INFORMATION_SCHEMA.schemata WHERE schema_name<>'public' AND schema_owner='postgres' AND schema_name IS NOT NULL) UNION SELECT schemaname, matviewname, 'MATERIALIZED VIEW' AS type, regexp_replace(definition,'[\r\n]','<br>','g') AS definition FROM pg_catalog.pg_matviews) AS foo WHERE view_definition ~*'(union|except|intersect)[[:space:]]+all' ORDER BY table_schema, table_name; |
Collection name | Collection description |
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Find problems by overview | Queries that results point to different aspects of database that might have problems. A human reviewer has to decide based on the results as to whether there are problems or not . |
Category name | Category description |
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Derived tables | Queries of this category provide information about the derived tables (views, materialized views), which are used to implement virtual data layer. |