Derived tables with string

WITH user_defined_derived_tables AS (SELECT
table_schema,
table_name,
regexp_replace(
regexp_replace(
regexp_replace(
regexp_replace(
regexp_replace(
regexp_replace(
regexp_replace(
regexp_replace(
regexp_replace(
regexp_replace(
regexp_replace(
view_definition,'FROM','<br><b>FROM</b>','g'),
'ORDER BY','<br><b>ORDER BY</b>','g'), 
'WHERE','<br><b>WHERE</b>','g'), 
'GROUP BY','<br><b>GROUP BY</b>','g'), 
'SELECT','<b>SELECT</b>','g'), 
'LEFT JOIN','<font color=red>LEFT JOIN</font>','g'), 
'RIGHT JOIN','<font color=red>RIGHT JOIN</font>','g'),  
'HAVING','<br><b>HAVING</b>','g'),
'UNION','<br><b>UNION</b>','g'),
'EXCEPT','<br><b>EXCEPT</b>','g'),
'INTERSECT','<br><b>INTERSECT</b>','g') AS def,
table_type
FROM (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
ORDER BY table_name) AS foo)
SELECT table_schema, table_name, def, table_type
FROM user_defined_derived_tables
WHERE def~*'string_agg[(]'
ORDER BY table_schema, table_name;

Query goal:	Find views and materialized views that use string_agg aggregate function.
Notes about the query:	In the returned subquery of view/materialized view the query adds line break (br) tag at the beginning of each clause for the better readability in case the query result is displayed in a web browser. LEFT JOIN and RIGHT JOIN keywords are marked with red because quite often outer join is used unnecessarily because INNER JOIN operation would be enough. The query uses (b) tags to mark some of the main clauses in the subquery of the derived table.
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 WITH user_defined_derived_tables AS (SELECT table_schema, table_name, regexp_replace( regexp_replace( regexp_replace( regexp_replace( regexp_replace( regexp_replace( regexp_replace( regexp_replace( regexp_replace( regexp_replace( regexp_replace( view_definition,'FROM','<br><b>FROM</b>','g'), 'ORDER BY','<br><b>ORDER BY</b>','g'), 'WHERE','<br><b>WHERE</b>','g'), 'GROUP BY','<br><b>GROUP BY</b>','g'), 'SELECT','<b>SELECT</b>','g'), 'LEFT JOIN','<font color=red>LEFT JOIN</font>','g'), 'RIGHT JOIN','<font color=red>RIGHT JOIN</font>','g'), 'HAVING','<br><b>HAVING</b>','g'), 'UNION','<br><b>UNION</b>','g'), 'EXCEPT','<br><b>EXCEPT</b>','g'), 'INTERSECT','<br><b>INTERSECT</b>','g') AS def, table_type FROM (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 ORDER BY table_name) AS foo) SELECT table_schema, table_name, def, table_type FROM user_defined_derived_tables WHERE def~*'string_agg[(]' ORDER BY table_schema, table_name;

Derived tables with string_agg

Categories where the query belongs to

Reference materials for further reading