| Query goal: | Find derived tables with a search condition that is possible based on a name instead of a code. |
| Query type: | Problem detection (Each row in the result could represent a flaw in the design) |
| Query reliability: | Low (Many false-positive results) |
| Query license: | MIT License |
| Fixing suggestion: | Typically names change more frequently than codes and thus the search conditions should refer to codes instead of names, if possible in order to reduce the need to rewrite views in case of data changes. |
| Data source: | INFORMATION_SCHEMA+system catalog |
| SQL query: | Click on query to copy it
WITH user_defined_derived_tables AS (SELECT views.table_schema, views.table_name, views.view_definition, 'VIEW' AS table_type 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, definition, 'MATERIALIZED VIEW' AS table_type FROM pg_catalog.pg_matviews) SELECT table_schema, table_name, regexp_replace( regexp_replace(view_definition,'((?<!(LEADING|TRAILING|BOTH)[[:space:]])FROM|ORDER BY|WHERE|GROUP BY|SELECT|HAVING|UNION|EXCEPT|INTERSECT|LIMIT|FETCH FIRST)','<br><b>\1</b>','g'), '(LEFT JOIN|RIGHT JOIN|CROSS JOIN|FULL JOIN)','<font color=red>\1</font>','g') AS def, table_type FROM user_defined_derived_tables WHERE view_definition~*'(?<=WHERE.*)''[[:alpha:]]{6,}''' ORDER BY table_schema, table_name; |
| Category name | Category description |
|---|---|
| Comfortability of data management | Queries of this category provide information about the means that have been used to make the use or management of database more comfortable and thus, more efficient. |
| Derived tables | Queries of this category provide information about the derived tables (views, materialized views), which are used to implement virtual data layer. |